ChatGPT answers, unedited

For one-off digital assets + automatic license-key delivery, I’d shortlist these:

My recommendation: Lemon Squeezy

Lemon Squeezy is probably the closest match to your requirements. It supports one-time digital products, hosted files, a standalone storefront/checkout, and automatically generated license keys. It also provides a licensing API and webhooks if your asset needs to validate keys inside an application. LemonSqueezy Lemon Squeezy Docs Lemon Squeezy Docs

lemonsqueezy.com

A typical flow would be:

Product page → checkout → payment → license key generated → key shown/emailed to customer → digital asset delivered

If you're selling something like a plugin, desktop app, game asset, design asset, template, or other downloadable product, that gives you most of the infrastructure without having to build your own licensing and fulfillment system.

When I'd choose Sellfy instead

Sellfy is particularly attractive if the storefront itself matters more than developer/API capabilities. It can generate unique keys automatically or distribute a pre-existing inventory of keys, and keys can be validated, activated, deactivated, and revoked through its API. Sellfy Help Center Sellfy

sellfy.com

One useful distinction: Sellfy can distribute your own pre-generated keys, which is handy if your licensing system already exists. Sellfy Help Center

When I'd choose Paddle

Paddle makes more sense if this is becoming a software business rather than simply a digital-download shop. It supports one-time software licenses and downloads, and acts as merchant of record, handling payments, tax, fraud, and compliance. Its fulfillment model is particularly suited to custom/backend integrations and webhooks. Paddle Developer Docs Paddle

paddle.com

Bottom line: I'd start with Lemon Squeezy unless you specifically need Sellfy's creator-oriented storefront or Paddle's more developer-centric infrastructure.

If you tell me what kind of assets you're selling (e.g. software, fonts, 3D models, plugins, stock media, templates) and whether you need single-use keys vs. keys with activation limits, I can narrow this to the most appropriate setup.

I’d use Lemon Squeezy. It’s specifically suited to one-off digital products with automatic license-key generation, activation limits, secure file delivery, hosted storefronts, and checkout links. LemonSqueezy Lemon Squeezy Docs

• Best fit: software, plugins, templates, downloadable assets.
• License keys: unique keys can be generated per purchase, with configurable duration/activation limits. Lemon Squeezy Docs
• Delivery: files are delivered after purchase via the receipt/customer account. Lemon Squeezy Docs
• Storefront: hosted storefront or embeddable checkout. LemonSqueezy
• Pricing: currently 5% + $0.50 per transaction, with some additional fees depending on transaction type. gumkit.app

lemonsqueezy.com

For your exact use case, I’d choose it over a general creator storefront like Gumroad because license management is a first-class feature rather than something you have to bolt on.

For one-off digital assets + automatic license-key delivery, I’d shortlist these:

• lemonsqueezy.com — my pick for software/assets. It combines a hosted storefront, one-time payments, digital-file hosting/delivery, and built-in license-key generation. You can set license duration and activation limits, and there’s a License API/webhooks if your product needs to validate keys inside an app. LemonSqueezy Lemon Squeezy Docs Lemon Squeezy Docs
• sellfy.com — good if you want a simple creator storefront. It supports digital downloads and automatically delivers either generated keys or your own pre-generated pool of keys. It also provides API operations for validating, activating, deactivating, and revoking keys. Sellfy Help Center Sellfy Help Center
• gumroad.com — simplest creator-oriented option. It supports license keys, with keys appearing in receipts and the buyer's download area. Its licensing is more oriented toward proving a purchase than providing a sophisticated licensing backend. Gumroad Gumroad

What I'd choose

If your "digital assets" are things like plugins, apps, templates with serial numbers, game assets, fonts, or downloadable software, I'd start with Lemon Squeezy. The combination of:

storefront → payment → file delivery → unique key → activation limits → API/webhooks

means you don't have to build much infrastructure yourself. Lemon Squeezy Docs Lemon Squeezy Docs

If you simply need "customer pays $X, gets a ZIP + unique key", Sellfy is also a particularly direct fit. Sellfy Help Center

If you tell me what kind of asset you're selling and whether the license key needs to be validated by an app, I can narrow this down and lay out the exact architecture I'd use.

For one-off digital assets + automatic license-key delivery, my first choice would be Lemon Squeezy.

My recommendation

1. Lemon Squeezy — best overall

lemonsqueezy.com

It gives you the pieces you need in one place:

• Hosted storefront for your products.
• One-time purchases rather than requiring subscriptions.
• Secure hosting and delivery of digital files.
• Automatic unique license-key generation per purchase.
• Configurable license length and activation limits.
• License keys appear in the customer's receipt/order page.
• API + webhooks if you eventually want your own activation server. Lemon Squeezy Docs LemonSqueezy Lemon Squeezy Docs

For example, your flow could be:

Product page → Checkout → Payment → Download + unique key → Customer activates asset

This is particularly attractive if your "digital assets" are things like plugins, templates, fonts, desktop software, design assets, or developer tools.

Other good options

2. SendOwl — best if delivery/security is the priority

sendowl.com

SendOwl is unusually good for digital delivery. It can generate unique keys, consume keys from your own inventory, or call your server to obtain a key. It also provides secure download links and can deliver the key through the download page and email. SendOwl Help Center SendOwl Help Center

I'd choose it if you already have your own website/storefront and primarily need checkout + fulfillment + licensing.

3. Gumroad — easiest/fastest setup

gumroad.com

Gumroad has built-in storefronts and license keys, including an API for verifying keys. Customers can receive their key in the receipt and download area. Gumroad Gumroad

It's probably the quickest way to go from "I have a ZIP file" → "people can buy it", although I'd favor Lemon Squeezy for a more software-oriented licensing setup.

What I'd pick

One important distinction: if by "license key" you mean a code that merely identifies the purchase, all three work. If you need activation limits, expiration, revocation, device management, or your app checking a license server, I'd go with Lemon Squeezy. Its licensing system explicitly supports activation limits and license duration. Lemon Squeezy Docs

If you tell me what kind of digital asset you're selling (e.g. Figma files, WordPress plugins, fonts, 3D assets, desktop software, API keys), I can recommend the best architecture and storefront for that specific case.

For one-off digital assets where each buyer should receive a license key, my top pick is Lemon Squeezy.

🥇 Lemon Squeezy — best overall

lemonsqueezy.com

It fits your use case unusually well:

• One-time purchases — you can sell individual assets rather than subscriptions. Lemon Squeezy Docs LemonSqueezy
• Automatic license-key generation — each purchase can generate a unique key, with configurable license duration and activation limits. Lemon Squeezy Docs Lemon Squeezy Docs
• Automatic delivery — upload ZIPs, PDFs, software, etc.; buyers can access the files after purchase. LemonSqueezy Lemon Squeezy Docs
• Hosted storefront — you don't have to build an ecommerce backend yourself, and you can also embed its checkout into your own site. LemonSqueezy
• License API/webhooks — useful if the asset is software and you need your application to validate/revoke keys. Lemon Squeezy Docs
• It operates as a merchant of record, which is particularly useful if you're selling internationally and don't want to build your own tax/VAT infrastructure. LemonSqueezy

A typical flow would be:

Storefront → checkout → payment → unique license key generated → buyer receives key + download → your software validates key

🥈 Gumroad — simplest alternative

gumroad.com

Gumroad is also a good fit if you want something extremely simple. It supports hosted storefronts, digital downloads, and license keys, and buyers can retrieve their key from their receipt/download page. Gumroad Gumroad

I'd choose Gumroad if ease of launching and creator-oriented storefront features matter more than having sophisticated licensing infrastructure.

🥉 Paddle — better for a software business

paddle.com

Paddle is worth considering if these "digital assets" are actually software products/plugins/apps and you're expecting a more substantial software business. It supports one-time software-license purchases, global tax/compliance handling, and webhooks that you can use to fulfill a license after payment. Paddle Developer Docs

The tradeoff is that it's more of a commerce infrastructure platform than a dead-simple digital-download storefront.

My recommendation

I'd start with Lemon Squeezy. It gives you the cleanest combination of storefront, one-time checkout, file delivery, license-key generation, activation limits, and API-based validation without having to assemble several services yourself. LemonSqueezy Lemon Squeezy Docs

If you tell me what kind of digital assets you're selling (e.g. fonts, plugins, desktop software, templates, 3D assets, audio), I can recommend the best setup—including how I'd structure the license keys and delivery flow.

For your use case—selling one-off digital assets (files) and automatically delivering license keys after purchase—I'd prioritize platforms that combine checkout, digital delivery, and licensing rather than assembling multiple services.

Here's how I'd rank them:

1. Lemon Squeezy (my recommendation)

If your "digital assets" include software, plugins, templates, game assets, fonts, or anything that benefits from licensing, Lemon Squeezy is a particularly good fit.

Pros:

• Native storefront
• Automatic file delivery
• Built-in license key generation
• License activation API
• Handles VAT/GST as the merchant of record
• Supports one-time purchases and coupons
• Good webhook support if you later automate fulfillment

This means the buyer experience is:

1. Purchase
2. Receive download link
3. Receive license key
4. Download immediately

No custom backend is required for a simple setup. Lemon Squeezy is especially strong for software-oriented products because licensing is a first-class feature rather than an add-on. The Software Brief The Software Scout

2. Gumroad

If your biggest priority is launching today with almost no configuration, Gumroad is hard to beat.

Pros:

• Extremely easy setup
• Attractive hosted storefront
• Digital delivery
• Customer library
• Basic license key support
• No coding required

Tradeoffs:

• Less sophisticated licensing
• Higher transaction fees than Lemon Squeezy
• Better suited to creators than software vendors. StackDrawer AI Biz Hub

3. Paddle

I'd recommend Paddle only if you expect to grow into a SaaS business.

It's excellent for:

• subscriptions
• enterprise customers
• international tax compliance

For simple downloadable assets with license keys, it tends to require more setup than necessary. The Software Scout Founder Toolkit

If you need custom license keys

If you already have your own licensing system (or want to generate serial numbers yourself), you can use:

• Stripe
• Shopify
• WooCommerce

and trigger key delivery via webhooks to your own licensing service.

That gives maximum flexibility but also means maintaining your own backend.

My recommendation based on seller type

• Solo creator selling templates, assets, fonts, or plugins: Lemon Squeezy
• Want the fastest possible launch: Gumroad
• Building a commercial desktop app or SaaS: Lemon Squeezy
• Expecting enterprise-scale subscription billing: Paddle

If you tell me what kind of digital asset you're selling (e.g. Unity assets, Unreal assets, Photoshop brushes, fonts, desktop software, API keys, game mods, etc.), I can recommend a setup optimized for that specific product type.

Recommendation: Lemon Squeezy

For one-off digital assets + automatic license-key delivery, I’d pick lemonsqueezy.com.

It’s unusually well matched to your use case because it combines:

• Hosted storefront — you can launch a storefront without building the ecommerce backend yourself. Lemon Squeezy Lemon Squeezy Docs
• One-time purchases — products can be sold as single-payment items rather than subscriptions. Lemon Squeezy Docs
• Digital-file delivery — upload ZIPs, apps, PDFs, assets, etc., and Lemon Squeezy handles secure delivery. Lemon Squeezy Lemon Squeezy
• Automatic license keys — every purchaser can receive a unique key, with configurable license duration and activation limits. Lemon Squeezy Docs
• License API — if your asset is software, your app can validate/activate/revoke licenses against Lemon Squeezy. Lemon Squeezy Docs
• Merchant of Record — Lemon Squeezy handles payment processing and sales-tax/VAT responsibilities, which is particularly useful if you're selling internationally. Lemon Squeezy

A good setup

I'd structure each product roughly like this:

Product: My Asset — Pro License
Price: $49 one-time
Files: asset.zip
License: 1 activation, valid indefinitely
After checkout: customer gets download + license key
Your app/site: calls the license API to verify the key

If you want different licensing tiers, create variants such as:

• Personal — 1 activation
• Professional — 3 activations
• Studio — 10 activations

Lemon Squeezy explicitly supports variants with different activation limits, so you don't need to build that licensing infrastructure yourself. Lemon Squeezy Docs

Alternatives

Gumroad is the easiest alternative if you want maximum simplicity. It has a hosted storefront, digital delivery, and built-in license keys. However, its license-key system is primarily aimed at software; the keys don't themselves restrict access to things like audio, video, or ebook files. Gumroad Gumroad

Paddle is the stronger alternative if you're building a more sophisticated software business. It supports one-time software licenses and digital downloads, webhooks, localized pricing, and merchant-of-record tax handling. Paddle Developer Docs Paddle The tradeoff is that it's more developer-oriented than Lemon Squeezy.

My ranking

*Paddle gives you the transaction/webhook infrastructure; your fulfillment flow can issue the license key. Paddle Developer Docs

Bottom line: If you're selling things like plugins, desktop apps, templates with license restrictions, fonts, creative assets, or other downloadable products, I'd start with Lemon Squeezy. It gives you the storefront and checkout while also solving the annoying parts—secure file delivery, license generation, activation limits, and international tax handling. Lemon Squeezy Lemon Squeezy Docs

If you tell me what kind of digital assets you're selling (software, plugins, design files, fonts, etc.) and your expected price/volume, I can narrow this down to the best platform and architecture for you.

For one-off digital assets + automatic license-key delivery, my first choice would be Lemon Squeezy.

Best fit: Lemon Squeezy

Lemon Squeezy is particularly well suited if your assets are things like software, plugins, templates, fonts, design packs, or downloadable files.

• Hosted storefront: You can use its storefront directly or embed checkout into your own site. LemonSqueezy
• One-time purchases: Supports one-off pricing alongside subscriptions. LemonSqueezy
• Automatic license keys: It can generate a unique key for each purchase, with configurable license length and activation limits. Lemon Squeezy Docs
• Digital delivery: Files can be hosted and delivered automatically after purchase. LemonSqueezy
• Merchant of Record: Lemon Squeezy handles payment/tax compliance, which is valuable if you expect international customers. LemonSqueezy
• Developer-friendly: There's a license API/webhooks if you eventually want your software to validate keys automatically. Lemon Squeezy Docs

lemonsqueezy.com

Two alternatives

Gumroad — simplest if you want to get selling quickly. It supports license keys and an API for verifying them, including usage counts and revocation-related checks. Gumroad

gumroad.com

Paddle — stronger choice if this is primarily a software business and you expect more sophisticated billing/international sales. It supports one-time software licenses and acts as a Merchant of Record. Paddle Developer Docs Paddle

paddle.com

My recommendation

For your specific description, I'd start with Lemon Squeezy. It gives you the shortest path from “asset exists” → “customer pays” → “customer receives download + unique license key”, without having to build the commerce infrastructure yourself. LemonSqueezy Lemon Squeezy Docs

For one-off digital assets + automatic license-key delivery, my first choice is Lemon Squeezy.

lemonsqueezy.com

Why I’d pick it

• Hosted storefront: You can launch a standalone storefront without building your own commerce backend. LemonSqueezy
• One-time purchases: Works naturally for individual purchases rather than requiring subscriptions. LemonSqueezy
• Automatic license keys: It can generate a unique key for each purchase, with configurable license length and activation limits. Lemon Squeezy Docs Lemon Squeezy Docs
• Automatic file delivery: You can upload ZIPs, apps, PDFs, images, audio, etc., and have them securely delivered after purchase. LemonSqueezy
• License management: You can deactivate/reissue keys and use its API if your asset needs an activation/validation system. Lemon Squeezy Docs
• Merchant of record: Lemon Squeezy handles payments and sales-tax/VAT responsibilities, which is particularly attractive if you're selling internationally. LemonSqueezy

How I'd structure it

Product → Checkout → Payment → License + download → Customer

For example, if you're selling a $49 design asset:

1. Customer visits your storefront.
2. Buys Asset X — Commercial License for $49.
3. Lemon Squeezy processes the payment.
4. Customer receives the download.
5. Customer receives a unique license key.
6. Your application/site can validate that key through Lemon Squeezy's License API if necessary. Lemon Squeezy Docs

One important alternative

Paddle is also very good if these are primarily software products and you expect to build a more customized commerce/fulfillment backend. Paddle supports one-time digital products and software licenses, but its current Billing product expects you to implement your own fulfillment workflow around webhooks. Paddle Developer Paddle Developer

So I'd rank them:

Bottom line: If you want “put my assets in a storefront, accept a one-time payment, automatically give the buyer the file and a license key, and don't build the commerce infrastructure myself,” I'd start with Lemon Squeezy. LemonSqueezy Lemon Squeezy Docs

For your use case, I’d recommend Lemon Squeezy.

lemonsqueezy.com

Why it fits

• One-off digital products: You can sell individual files/products with one-time pricing and variants. Lemon Squeezy Docs Lemon Squeezy Docs
• Automatic license keys: Enable license generation per product/variant; each buyer gets a unique key in their receipt and order history. Lemon Squeezy Docs
• Activation limits: You can specify how many devices/instances a license can activate and how long it remains valid. Lemon Squeezy Docs
• Actual license API: If your asset is software or something that needs validation, your application can activate, validate, deactivate, and check license status through the API. Lemon Squeezy Docs Lemon Squeezy Docs
• Hosted storefront: You don't have to build the checkout/store infrastructure yourself. Products can appear in a hosted storefront or be sold through checkout links/embedded checkout. Lemon Squeezy Docs Lemon Squeezy Docs
• Digital delivery: Buyers can receive downloadable files or be redirected to a URL after purchase. Lemon Squeezy Docs
• Merchant-of-record model: Lemon Squeezy handles sales tax/VAT responsibilities as the merchant of record, which can substantially reduce ecommerce plumbing for a small operation. Lemon Squeezy Docs

A good setup

I'd structure each asset like this:

Product → Variant → Download + License Key

For example:

3D Asset — Cyberpunk Vehicle Pack
$29 one-time
→ Download ZIP
→ License key: XXXX-XXXX-XXXX-XXXX
→ 2 activations

If these are software assets/plugins/templates that actually need license enforcement, Lemon Squeezy becomes particularly attractive because you can validate the key from your own application rather than merely emailing a serial number. Lemon Squeezy Docs

Runner-up: Gumroad

gumroad.com

Gumroad is worth considering if simplicity and creator-style storefronts are more important than sophisticated licensing. It supports digital downloads and generates license keys, and buyers can find their keys in receipts and download pages. Gumroad Gumroad

The important distinction is that Gumroad's licensing is primarily designed for software; its license keys don't themselves restrict access to ordinary audio/video/ebook downloads. Gumroad

My pick: Lemon Squeezy if license keys are a core requirement; Gumroad if they're incidental and you mainly want an extremely simple digital-download storefront.

For one-off digital assets where each buyer should receive a license key, my first choice would be Lemon Squeezy.

My recommendation: Lemon Squeezy

lemonsqueezy.com is particularly well matched to your use case:

• One-time purchases: You can sell individual products rather than forcing subscriptions. Lemon Squeezy Docs
• License-key generation: It can automatically issue license keys after a software sale, and provides controls to deactivate/reissue them. LemonSqueezy
• Digital delivery: Upload the asset and let customers retrieve it through their purchase/account flow, or redirect them to your own download URL. Lemon Squeezy Docs
• Storefront included: You can use its hosted storefront rather than building a complete ecommerce site yourself. Lemon Squeezy Docs
• Merchant of record: It handles the payment/tax-compliance side, which is valuable if you're selling internationally.
• API/webhooks: Useful if you eventually want your own app to validate licenses, provision accounts, or automate fulfillment.

The basic architecture would be:

Storefront → Checkout → Payment → License generated → Asset + key delivered → Your software validates key

Two alternatives worth considering

Gumroad is probably the easiest if you want extremely little setup. It has native license keys, including an API for verifying them, and customers can retrieve their key from their receipt/download page. Gumroad

gumroad.com

I'd choose Gumroad if the product is more like a downloadable asset/template/plugin and you don't need a sophisticated licensing system.

Paddle is another strong option if you're selling actual software and expect to grow. It supports one-time software purchases and lets your backend issue the license after receiving its transaction.completed webhook. Paddle Developer Docs

paddle.com

What I'd pick

One important distinction: "license key delivery" and "license enforcement" are different things. For example, Gumroad will issue keys, but your application is responsible for deciding what a valid key permits and when/how often it is checked. Gumroad

If you tell me whether these assets are software/plugins, design files, 3D assets, ebooks, or something else, I can recommend the best architecture and storefront—including the cheapest option at your expected price/volume.

For one-off digital assets + automatic license-key delivery, my top recommendation is Lemon Squeezy.

Why Lemon Squeezy fits

• One-time purchases: You can sell individual digital products with one-off pricing, not just subscriptions. LemonSqueezy
• Automatic license keys: Each purchase can generate a unique key, which is shown in the buyer's receipt/order area. You can set license duration and activation limits. Lemon Squeezy Docs
• Digital file delivery: It hosts your files and handles secure delivery after purchase. LemonSqueezy
• Storefront included: You can use its hosted storefront, checkout links, or embed checkout into your existing site. LemonSqueezy LemonSqueezy
• License API: If the asset is software, your application can activate and validate the key against Lemon Squeezy's API. Lemon Squeezy Docs
• Merchant of record: Lemon Squeezy handles sales tax/VAT, payments, refunds/chargebacks, and related compliance, which is particularly useful if you're selling internationally. Lemon Squeezy Docs

lemonsqueezy.com

Runner-up: Gumroad

Gumroad is probably the simplest alternative. It supports digital downloads and automatically generated license keys, including multi-seat licenses, and provides an API for verifying keys. Gumroad Gumroad

gumroad.com

I'd choose Gumroad if your priority is "get a simple storefront online with almost no engineering." I'd choose Lemon Squeezy if you're selling software/assets where licensing, activation limits, secure delivery, and international tax handling matter.

My pick: Lemon Squeezy for a professional asset store; Gumroad for the quickest, simplest launch.

For one-off digital assets + automatic license-key delivery, my top recommendation is Lemon Squeezy.

lemonsqueezy.com

Why I’d pick it

• Hosted storefront: You can use its built-in storefront or embed checkout into your own site. Lemon Squeezy Docs Lemon Squeezy Docs
• One-time purchases: Supports single-payment products, not just subscriptions. Lemon Squeezy Docs
• Digital file delivery: Upload ZIPs, PDFs, images, audio, video, software, etc.; customers can download them after purchase. LemonSqueezy
• Automatic license keys: Enable license generation on a product/variant and Lemon Squeezy generates a unique key for each purchaser. The key appears in the customer's receipt and order history. Lemon Squeezy Docs
• License controls: You can set an expiration period and activation limit—for example, a perpetual asset with a 3-device activation limit, or a 1-year license. Lemon Squeezy Docs
• API: If your asset is software, you can have the application activate/validate the key against Lemon Squeezy's License API and deactivate licenses when necessary. Lemon Squeezy Docs Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles payment/tax-related responsibilities as the merchant of record, which can substantially simplify selling internationally. Lemon Squeezy Docs

A good setup

I'd structure each asset as:

Product → Variant → Checkout → Payment → License generated → Download + key delivered

For example:

Asset: Pro Icon Pack
Price: $29 one-time
Files: icon-pack.zip
License: 1 purchase / 3 activations
Delivery: download link + unique license key in receipt

If these are software assets, I'd choose Lemon Squeezy fairly decisively because the licensing system is built into the commerce workflow rather than requiring you to bolt a separate license-key service onto a digital-download store.

Runner-up: Gumroad. It also supports license keys, including multi-seat licenses, and customers can receive keys through receipts/download pages. Gumroad But for a software-oriented storefront where licensing is central, I prefer Lemon Squeezy's dedicated activation/validation controls and API.

docs.lemonsqueezy.com

If you tell me what kind of digital assets you're selling (software, plugins, fonts, templates, 3D assets, etc.) and roughly how many products, I can recommend the best architecture—including whether you should use Lemon Squeezy, Gumroad, Paddle, or a custom Stripe-based storefront.

For selling one-off digital assets with automatic license-key delivery, I’d shortlist these options:

My recommendations by scenario

1. Selling software, plugins, desktop apps, or developer tools

Pick Lemon Squeezy.

Good fit:

• Customer buys once
• Receives a license key immediately
• Your app checks the key against an API
• You may later add subscriptions or upgrades

It combines checkout, taxes, file delivery, and licensing in one workflow. LemonSqueezy

2. Selling downloadable assets (3D models, fonts, presets, templates, sample packs) plus optional keys

Pick SendOwl.

Good fit:

• ZIP/PDF/media delivery
• One-time purchases
• Unique codes from a pre-generated pool
• Custom key-generation endpoint
• More control over download security

SendOwl supports license-code products where buyers receive unique codes after purchase. SendOwl Help Center

3. You want to launch this weekend with minimal setup

Pick Gumroad.

Good fit:

• Small catalog
• Audience from social/newsletters
• Simple checkout page
• Basic license verification needs

Gumroad can issue keys and provides a verification API, though you’ll still build the actual entitlement logic in your product. Gumroad

A simple architecture I’d use

For a professional software product:

1. Storefront: Lemon Squeezy or SendOwl
2. Payment webhook: receives successful purchase event
3. License database: stores: - license ID
4. customer email
5. product/version
6. activation count
7. expiration (if applicable)
8. App activation API: your software checks: - Is this key valid?
9. Has it been revoked?
10. How many devices are activated?

Avoid putting the entire licensing logic inside the storefront; treat the storefront as the payment and delivery layer.

My default pick

• Software license keys: Lemon Squeezy
• Digital assets + occasional keys: SendOwl
• Simple creator products: Gumroad

If you tell me what kind of asset you’re selling (software, game keys, fonts, 3D files, plugins, templates, etc.) and whether you need license activation limits / subscriptions / DRM, I can narrow it down.

If by “one-off digital assets” you mean things like software, plugins, templates, downloadable files, or other digital goods where each purchase should produce a unique license key, my first choice would be lemonsqueezy.com.

Why Lemon Squeezy fits

• One-time purchases: You can sell individual digital products with a single payment, rather than requiring subscriptions. Lemon Squeezy Docs Lemon Squeezy Docs
• Automatic license-key generation: Enable licensing on a product/variant and Lemon Squeezy generates a unique key for every purchaser. The key appears in the customer's receipt and order history. Lemon Squeezy Docs
• Activation limits: You can specify how many devices/instances a key can activate on, as well as license duration. Lemon Squeezy Docs
• Actual license API: Your application can activate, validate, and deactivate keys rather than merely emailing a static code. Lemon Squeezy Docs
• Hosted storefront: You get a storefront out of the box, while also being able to use checkout links/overlays on your own site. Lemon Squeezy Docs
• Variants: Useful if, for example, you want a $29 personal license, $79 commercial license, and $199 team license, each with different activation limits. Lemon Squeezy Docs
• Merchant-of-record model: Lemon Squeezy handles sales-tax/VAT responsibilities as the merchant of record, which can substantially reduce ecommerce plumbing. Lemon Squeezy Docs

Runner-up: Gumroad

gumroad.com also has built-in license keys and an API for verification. Customers can receive keys in their receipt/download area. Gumroad

I'd favor Gumroad if creator-oriented storefront/distribution simplicity is more important than sophisticated licensing. One notable limitation is that Gumroad's license enforcement is largely up to your application—you make the verification calls and decide what constitutes valid access. Gumroad

My recommendation

For a software/plugin/asset marketplace where licensing is a core feature, I'd choose Lemon Squeezy. You can essentially have:

Storefront → Checkout → Payment → Unique license key → Customer downloads asset → Your app validates key via API

docs.lemonsqueezy.com

If you tell me what kind of assets you're selling (software, Figma files, 3D assets, fonts, ebooks, etc.), I can narrow this down further and recommend the best architecture for delivery + licensing.

Recommendation: lemonsqueezy.com

For one-off digital assets + automatic license-key delivery, Lemon Squeezy is probably the best fit.

Why:

• One-time payments: You can sell products as a single charge rather than a subscription. Lemon Squeezy Docs
• Automatic license keys: Each purchase can generate a unique key, with configurable license duration and activation limits. Lemon Squeezy Docs
• Automatic delivery: It hosts your digital files and securely delivers them after purchase. Lemon Squeezy
• Hosted storefront: You can use its storefront directly, or embed/share checkout links from your own site. Lemon Squeezy Lemon Squeezy Docs
• License visibility: The buyer receives the key in their receipt and order area. Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles payments and sales-tax/VAT responsibilities as the merchant of record, which can substantially simplify selling internationally. Lemon Squeezy
• API/webhooks: If your asset is software, you can connect license activation, revocation, refunds, etc. to your own backend. Lemon Squeezy Docs

How I'd structure it

Your storefront → Lemon Squeezy checkout → payment → license key + download → your app/site validates key

For example, a $49 asset could produce:

Product: Pro Icon Pack
Price: $49 one-time

Buyer completes checkout
        ↓
Lemon Squeezy generates:
  License: XXXX-XXXX-XXXX-XXXX
  Download: secure download link
        ↓
Buyer receives receipt/email
        ↓
Your app/site:
  POST license key → Lemon Squeezy API
        ↓
  Valid / activation limit / refunded?

You can also create variants if you eventually want Personal / Commercial / Extended licenses, with different prices and activation limits. Lemon Squeezy Docs

Runner-up: gumroad.com

Gumroad is arguably simpler if you're primarily a creator selling files. It supports hosted storefronts, digital delivery, and license keys. Gumroad Its license system also supports multi-seat licenses and API verification. Gumroad

The important distinction is that Gumroad's license enforcement is largely your responsibility: your application needs to call its verification API and decide what to do with the result. Gumroad

My pick

I'd choose Lemon Squeezy if the license key is an important part of the product, particularly if you're selling software, plugins, templates with activation, fonts, assets with commercial licensing, or other products where you need to know whether a license is valid.

If these are literally unique, single-use assets—e.g. each buyer purchases one specific digital item and that item should never be resold—I can also recommend a setup specifically optimized for inventory of one-of-one digital assets + unique license keys, which is a slightly different problem.

For your specific use case—one-off digital assets + automatic license-key delivery—my first choice is Lemon Squeezy.

Why Lemon Squeezy

lemonsqueezy.com

• Hosted storefront: You can launch a storefront without building ecommerce infrastructure yourself. LemonSqueezy
• One-time purchases: Supports one-off products as well as subscriptions and product variants. Lemon Squeezy Docs
• Automatic license keys: It can generate a unique key for each purchase, with configurable activation limits and license duration. Lemon Squeezy Docs Lemon Squeezy Docs
• Digital-file delivery: Upload ZIPs, apps, assets, ebooks, etc., and customers can receive them through the purchase flow. LemonSqueezy
• License API: If your asset is software, you can have your app validate/activate keys against Lemon Squeezy rather than building the licensing infrastructure yourself. Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles payment processing and global sales-tax/VAT responsibilities, which is a major simplification if you're selling internationally. LemonSqueezy

How I'd structure it

Customer → Storefront → Checkout → Payment → License key + download → Your product

For example, suppose you're selling a $49 Photoshop/Figma/3D asset:

1. Create the product in Lemon Squeezy.
2. Upload the asset ZIP.
3. Enable Generate license keys.
4. Set the license duration/activation limit.
5. Customer purchases it.
6. Lemon Squeezy generates a unique key and delivers the purchase.
7. Your confirmation page/email can point them to the download and license information.
8. If it's software, your application can use the License API to validate the key.

That gives you a pretty complete system without having to build checkout + digital delivery + license generation + tax handling yourself.

One alternative worth considering

Paddle is also strong if your "digital assets" are primarily software. Paddle explicitly supports one-time software licenses and uses webhooks so your own backend can grant access or send a license after a completed transaction. Paddle Developer Docs

I'd pick:

Bottom line: If you want something you can set up quickly and have it behave like a real software/digital-product store, Lemon Squeezy is probably the best fit. Its combination of hosted storefront, one-time sales, file delivery, license-key generation, and Merchant-of-Record handling is unusually well matched to what you're describing. LemonSqueezy Lemon Squeezy Docs LemonSqueezy

Recommendation: lemonsqueezy.com

For one-off digital assets + automatic license-key delivery, I’d pick Lemon Squeezy as the default solution.

It fits your use case unusually well because it combines:

• Hosted storefront — you can sell without building your own commerce backend. Lemon Squeezy Docs Lemon Squeezy Docs
• One-time purchases — products can be sold as single-payment products rather than subscriptions. Lemon Squeezy Docs
• Digital-file hosting and delivery — upload ZIPs, software, ebooks, audio, etc., and Lemon Squeezy handles delivery after purchase. LemonSqueezy
• Automatic unique license keys — each buyer can receive a generated key in their receipt and order page. Lemon Squeezy Docs
• Activation limits and license duration — useful if your asset is software or a plugin and you want, say, 1 activation per purchase. Lemon Squeezy Docs
• API + webhooks — if you eventually want your own activation server, you can validate and manage licenses programmatically. Lemon Squeezy Docs Lemon Squeezy Docs
• Merchant of Record — Lemon Squeezy handles payment processing and sales-tax/VAT responsibilities rather than requiring you to build that infrastructure yourself. Lemon Squeezy Docs LemonSqueezy

A good setup

I'd structure each asset roughly like:

Product page → Checkout → Payment → Download + unique license key → Your app validates key

For example:

Pro Icon Pack — $39 one-time
ZIP download
Includes commercial license
1 license / 2 activations

After checkout, Lemon Squeezy delivers the ZIP and generates the customer's unique key. Your application can subsequently call the License API to verify that key and enforce activation limits. Lemon Squeezy Docs

Runner-up: Gumroad

gumroad.com is the simpler alternative. It also has storefronts, digital downloads, and license-key generation, and customers can retrieve keys from their receipt/download page. Gumroad Gumroad

I'd choose Gumroad if you're primarily selling creative assets and want the simplest creator-oriented storefront. I'd choose Lemon Squeezy if the license key is an important part of the product—especially for software, plugins, templates with activation, or developer tools.

Bottom line: for your exact combination of one-off digital products + storefront + file delivery + license keys, Lemon Squeezy is my first choice. LemonSqueezy Lemon Squeezy Docs

For your use case—one-off digital assets + automatic license-key delivery—my first choice is Lemon Squeezy.

lemonsqueezy.com

Why I’d pick Lemon Squeezy

• One-time payments: You can sell products as single-purchase products rather than subscriptions. Lemon Squeezy Docs
• Digital-file delivery: Upload ZIPs, apps, PDFs, assets, etc., and Lemon Squeezy handles secure delivery. LemonSqueezy Lemon Squeezy Docs
• Automatic license keys: Each purchase can automatically generate a unique key, which is included in the buyer's receipt/order. Lemon Squeezy Docs
• Activation limits: You can specify how many activations a key permits and how long it's valid. Lemon Squeezy Docs
• API: If your asset is software, your app can call the licensing API to activate/validate keys. Lemon Squeezy Docs
• Hosted storefront: You don't need to build an ecommerce backend; it provides a customizable hosted storefront and checkout. LemonSqueezy
• Merchant of record: Lemon Squeezy handles sales-tax/VAT responsibilities, which is particularly attractive if you're selling internationally. LemonSqueezy
• Customer portal: Buyers can access purchased files and licenses from one place. LemonSqueezy
• Pricing: Its current transaction pricing is listed as 5% + $0.50 per transaction, with no monthly payment-processing fee. LemonSqueezy

How I'd structure it

For each asset:

Product → Variant → Price + Files + License settings

For example:

"Pro Icon Pack"
   └── Standard License — $29
       ├── icon-pack.zip
       ├── License key: automatically generated
       └── Activation limit: 3

After purchase:

Payment
   ↓
Lemon Squeezy
   ├── Delivers asset
   ├── Generates license key
   └── Emails receipt + key
            ↓
       Your application
            ↓
       License API
            ↓
      Activate / validate

This is considerably cleaner than cobbling together Stripe + a file host + an email system + a separate license-key service.

Runner-up: Gumroad

gumroad.com

Gumroad is a good alternative if the products are primarily creator-oriented downloads and you want the simplest possible storefront. It supports license keys, including multi-seat licenses, and provides an API for your application to verify them. Gumroad Gumroad

The important distinction is that Gumroad's license enforcement is largely your responsibility: your application needs to perform the verification; Gumroad doesn't enforce the license for you. Gumroad

My recommendation

If these are software assets, plugins, templates with licensing, fonts, or anything where license validation matters, I'd choose Lemon Squeezy. If they're mostly downloadable creator assets and licensing is secondary, Gumroad is worth considering.

If you tell me what kind of digital assets you're selling (software, Figma files, 3D assets, fonts, plugins, etc.) and your typical price, I can narrow this down to the best 2–3 options and explain the exact checkout/license architecture I'd use.

For one-off digital assets + automatic license-key delivery, my top recommendation is lemonsqueezy.com.

Why Lemon Squeezy fits

• Built-in storefront: You can create a standalone storefront, or embed checkout into your own site. LemonSqueezy LemonSqueezy
• One-time purchases: It supports one-off charges alongside subscriptions, so you don't need to build recurring billing. LemonSqueezy
• License keys: It can automatically generate unique keys after purchase, with configurable license length and activation limits. Lemon Squeezy Docs
• Digital-file delivery: You can host the actual ZIP/PDF/video/software files and have them delivered after checkout. LemonSqueezy
• Merchant of Record: Lemon Squeezy handles payment/tax compliance as the seller, which is particularly useful if you're selling internationally. LemonSqueezy
• Developer-friendly: APIs and webhooks let you connect a purchase to your own licensing/activation server if the built-in licensing isn't sufficient.

How I'd structure it

Your storefront → Lemon Squeezy checkout → payment → automatic delivery

For each asset, configure:

1. Product + price
2. Digital download(s)
3. License key generation
4. Activation limit, e.g. 1–3 devices
5. License duration, if applicable
6. Post-purchase email/download access

If you're selling something like a Photoshop plugin, desktop app, design pack, 3D asset, code library, or other downloadable software, this gets you very close to an end-to-end store without building the commerce infrastructure yourself.

Alternatives

gumroad.com is the better choice if your priority is dead-simple creator storefront + selling directly to an audience. It also supports license keys for software and exposes them to customers in receipts/download pages. Gumroad Gumroad

paddle.com is worth considering if you're closer to a software/SaaS business and expect more sophisticated billing or international sales. Paddle explicitly supports one-time software licenses and can trigger fulfillment via webhooks. Paddle Developer Docs Paddle

My pick: Lemon Squeezy if the license key is an important part of the product. It gives you the storefront convenience of a creator platform while retaining the licensing/API capabilities you'd otherwise have to build yourself. LemonSqueezy Lemon Squeezy Docs

If you tell me what kind of digital asset you're selling and its typical price (e.g. $19 fonts, $49 plugins, $199 software licenses), I can narrow this down to the best 2–3 options and compare the actual economics.

For your use case, my top recommendation is Lemon Squeezy.

lemonsqueezy.com is particularly well suited if you’re selling individual digital assets—for example plugins, templates, fonts, design files, ebooks, software, or other downloadable products—and some purchases need a unique license key.

Why I’d pick Lemon Squeezy

• Hosted storefront: You can launch a storefront without building the ecommerce infrastructure yourself, or embed checkout into your existing site. Lemon Squeezy Lemon Squeezy Docs
• One-time purchases: It supports one-off products as well as subscriptions. Lemon Squeezy Docs
• Digital file delivery: Upload your assets and Lemon Squeezy handles secure delivery after purchase. Lemon Squeezy Lemon Squeezy
• Automatic license keys: It can generate a unique key for each purchase and include it in the customer's receipt/order page. You can set license duration and activation limits. Lemon Squeezy Docs
• API for your software: If the asset is software, you can validate and activate keys against their License API rather than building your own licensing backend. Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles payment processing, sales tax/VAT and related compliance, which is a significant advantage if you're selling internationally. Lemon Squeezy Lemon Squeezy
• Customer access: Buyers can retrieve their purchased files and license information rather than relying solely on the initial email. Lemon Squeezy Docs

A good setup

I'd structure it like:

Your storefront → Lemon Squeezy checkout → payment → automatic file + license delivery

For example:

Asset: Photoshop Plugin Pro
Price: $49 one-time
Purchase: Customer checks out
Delivery: ZIP download + unique license key
License: 1 activation / 1 year
Your app: Sends the key to Lemon Squeezy's API to validate activation

That gives you a fairly complete system without having to build payments, downloadable-file security, license generation, activation tracking, tax handling, and customer receipts yourself.

Runner-up: Paddle

Paddle is the other one I'd seriously consider. It supports one-time digital products, software licenses and downloads, and can trigger fulfillment through webhooks after a completed transaction. Paddle Developer Docs Paddle

I'd lean Lemon Squeezy if you want a simple creator/developer storefront with built-in licensing. I'd lean Paddle if you're building a more substantial software business and expect deeper billing/integration requirements.

Bottom line: For “sell a one-off digital asset + automatically give the buyer a license key”, Lemon Squeezy is probably the cleanest starting point.

For your use case, I’d pick lemonsqueezy.com.

It’s unusually well matched to one-off digital assets + automatic license-key delivery:

• One-time purchases: You can sell products with a single payment rather than requiring subscriptions. Lemon Squeezy Docs
• Automatic license keys: Each purchase can generate a unique key, which is delivered in the buyer’s receipt/order area. You can set license duration and activation limits. Lemon Squeezy Docs Lemon Squeezy Docs
• Digital file delivery: You can upload the asset itself and have customers download it after purchase. Downloads use signed links. LemonSqueezy
• Variants: Useful if, for example, you sell the same asset with a Personal, Commercial, or Extended license. Each variant can have its own price, files, and license-key settings. Lemon Squeezy Docs
• Hosted storefront: You don't need to build the entire ecommerce backend yourself; Lemon Squeezy provides a customizable storefront and checkout, and you can also embed checkout into your own site. LemonSqueezy
• Merchant of record: Lemon Squeezy handles payment processing and sales-tax/VAT responsibilities as the merchant of record. LemonSqueezy
• Pricing: Currently listed at 5% + $0.50 per transaction, with no monthly fee on its standard pricing page. LemonSqueezy

How I'd structure it

For each asset:

Product → License tier → Download + license key

For example:

• Asset: Acme Icon Pack
• Personal — $19 → 1 activation
• Commercial — $49 → 3 activations
• Extended — $99 → 10 activations

The buyer pays once, receives the download, and gets their unique key automatically. Your application can then validate/activate that key through Lemon Squeezy's API. Lemon Squeezy Docs

Runner-up: Gumroad

gumroad.com is worth considering if you prioritize the simplest creator storefront. It supports digital products and automatically generated license keys, and customers can find keys in their receipt/download page. gumroad.com gumroad.com

The important distinction is that Gumroad's license enforcement is more DIY: your application is responsible for deciding how and when to verify the key. gumroad.com

My choice: Lemon Squeezy if the license key is an important part of the product; Gumroad if you mainly want a dead-simple digital-download storefront.

If you tell me whether these assets are software/plugins, fonts, 3D assets, templates, music, or something else, I can narrow this down further and suggest the best architecture for license generation, delivery, and revocation.

For one-off digital assets + automatic license key delivery, I’d shortlist solutions based on how much infrastructure you want to own.

Best overall: lemonsqueezy.com

Best for: software, plugins, apps, templates, fonts, design assets, SaaS add-ons.

Why it fits:

• Hosted storefront and checkout
• Automatic digital delivery
• License key generation/management workflows
• Merchant-of-record model (handles sales tax/VAT in many cases)
• Good APIs/webhooks if you later connect activation servers

Tradeoff:

• Less customizable than running your own store
• Transaction fees are higher than a pure Stripe setup

Best if you want a simple creator storefront: gumroad.com

Best for: ebooks, presets, sample packs, templates, small digital downloads.

Pros:

• Very fast setup
• Built-in product pages
• Automatic file delivery
• Good customer experience

Tradeoff:

• License-key workflows are not its strongest area; you may need an external key system for serious software licensing.

Best if you want a full ecommerce site: shopify.com

Best for: brands that want a storefront, marketing, bundles, upsells, and a catalog.

You can add digital delivery and license-key apps; Shopify’s app ecosystem includes tools for selling digital products and license keys. Shopify App Store

Pros:

• Best storefront customization
• Strong payments, analytics, discounts, customer accounts
• Scales well

Tradeoff:

• More setup and monthly cost
• Usually requires an app for digital fulfillment/license management

Best for software licensing specifically: fastspring.com

Best for: desktop software, plugins, developer tools.

Pros:

• Built around software commerce
• License delivery, subscriptions, upgrades, trials
• Handles international payments/tax complexity

Tradeoff:

• More enterprise-oriented; may be excessive for small asset shops

Best lightweight “sell files + keys” option: sell.app

Best for: indie creators, game assets, code products, small digital catalogs.

It supports digital product delivery and license keys/codes as part of its storefront features. SellApp

My recommendation by use case

For most indie software or digital asset sellers today, I’d start with Lemon Squeezy: it gives you a storefront, checkout, delivery, and licensing without having to build the commerce stack yourself. If you outgrow it, you can move the license backend behind your own API later.

For your use case, I’d recommend lemonsqueezy.com.

It’s particularly well suited if the “digital assets” are things like software, plugins, templates, fonts, design packs, or other downloadable files where each buyer needs a license key.

Why Lemon Squeezy

• One-off purchases: You can sell products as single-payment purchases rather than subscriptions. Lemon Squeezy Docs Lemon Squeezy Docs
• Hosted storefront: It gives you a ready-made storefront, so you don't have to build the ecommerce layer yourself. You can also use checkout links on your own site. Lemon Squeezy Lemon Squeezy Docs
• Digital-file delivery: Upload your ZIP/PDF/etc. and Lemon Squeezy handles delivery after purchase. Downloads are securely signed and throttled. Lemon Squeezy Lemon Squeezy
• Automatic license keys: It can generate a unique key for every purchase and show it to the customer in their receipt and order history. Lemon Squeezy Docs
• License controls: You can configure license duration and activation limits—for example, one activation for a $29 license versus five for a higher-priced tier. Lemon Squeezy Docs
• API/webhooks: If your asset is software, you can have your application validate licenses against Lemon Squeezy rather than building the entire licensing backend yourself. Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles sales-tax/VAT responsibilities as the merchant of record, which can substantially simplify selling internationally. Lemon Squeezy
• No monthly fee: Its current listed pricing is 5% + $0.50 per transaction, with no monthly platform fee. Lemon Squeezy

The setup I'd use

Lemon Squeezy storefront → one-time checkout → automatic license key + secure download → optional license API

For example:

Pro Asset Pack — $49 one time
ZIP download
Includes commercial license
1 license key / 3 activations

After checkout, the customer receives the asset and a unique key. If it's software, your app can call the licensing API to verify the key and enforce activation limits.

Runner-up: Gumroad

gumroad.com is worth considering if you prioritize extreme simplicity and a creator-oriented storefront. It also supports digital products and license keys. Gumroad Gumroad

The important distinction is that Gumroad's license-key functionality is primarily aimed at software; its documentation explicitly notes that license keys don't restrict access to ordinary audio, video, or ebook downloads. Gumroad

My pick: Lemon Squeezy if licensing is a meaningful part of the product; Gumroad if it's primarily a simple downloadable asset and you want the quickest possible creator storefront.

My recommendation: lemonsqueezy.com

For one-off digital assets + automatic license-key delivery, Lemon Squeezy is probably the cleanest all-in-one choice.

Why it fits:

• One-time payments: You can sell products with a single payment rather than subscriptions. Lemon Squeezy Docs
• Digital file delivery: Upload ZIPs, software, ebooks, audio, etc., and Lemon Squeezy handles secure customer downloads. LemonSqueezy
• Automatic license keys: Each purchase can generate a unique key automatically. Keys can have expiration dates and activation limits. Lemon Squeezy Docs
• Customer access: Buyers receive the license key in their receipt and can access their order afterward. Lemon Squeezy Docs
• Hosted storefront: You don't need to build an ecommerce backend; it provides a storefront and checkout links, while also supporting a custom domain. Lemon Squeezy Docs Lemon Squeezy Docs
• Variants: Useful if you eventually want, say, a Standard license with 1 activation and a Pro license with 5. Each variant can have its own price, files, and licensing configuration. Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles sales-tax/VAT obligations as the merchant of record. LemonSqueezy
• Pricing: Its listed base transaction fee is 5% + $0.50, with no monthly payment-processing fee. LemonSqueezy

What the buyer experience could look like

Your storefront → Product page → Checkout → Payment → Download + license key

For example, someone buys:

Asset Pack — $29
Includes: asset-pack.zip
License: 1 activation

Buy now

After payment, Lemon Squeezy can provide the download and generate something like:

ABCD-1234-EFGH-5678

Your application can then call Lemon Squeezy's License API to verify that key when the customer activates the product. Lemon Squeezy Docs Lemon Squeezy Docs

Runner-up: Gumroad

gumroad.com is also viable, particularly if you're primarily selling creative assets rather than software. It has hosted storefronts, digital delivery, and license-key generation. Gumroad

The important distinction is that Gumroad's license enforcement is largely your responsibility: your software needs to call its verification API and decide what constitutes valid use. Gumroad

So I'd choose:

Bottom line: I'd start with Lemon Squeezy unless you specifically want Gumroad's creator-oriented ecosystem. It gets you remarkably close to “put my asset in a storefront, take payment, send the file, and issue a license key” without building the commerce infrastructure yourself. LemonSqueezy Lemon Squeezy Docs

docs.lemonsqueezy.com is a good place to start if the license key needs to be validated by your own application.

For one-off digital assets + automatic license-key delivery, my first choice would be Lemon Squeezy.

Why Lemon Squeezy fits

• Built-in storefront: You can launch a hosted storefront without building ecommerce infrastructure yourself. It also supports custom storefronts and checkout embeds. Lemon Squeezy Lemon Squeezy Docs
• One-time purchases: Products can be sold as one-off purchases rather than subscriptions. Lemon Squeezy Docs
• Automatic license keys: Enable license generation on a product/variant and Lemon Squeezy generates a unique key for each buyer. You can configure license duration and activation limits. Lemon Squeezy Docs Lemon Squeezy Docs
• Digital-file delivery: You can upload the asset and customers receive access through their purchase receipt/account. Lemon Squeezy Docs
• Merchant of Record: Lemon Squeezy handles payment processing and tax obligations as the merchant of record, which is particularly useful if you're selling internationally. Lemon Squeezy
• API/webhooks: If your asset has its own app or activation server, you can integrate the license lifecycle into your product rather than treating the key as just a string in an email. Lemon Squeezy Docs

How I'd structure it

Lemon Squeezy storefront → Checkout → Payment → License generated → Buyer receives download + key

For example, if you're selling a $49 design plugin:

1. Create the product and upload the plugin.
2. Enable Generate license keys.
3. Set the license to, say, 1–2 activations.
4. Customer purchases it through your storefront.
5. Lemon Squeezy generates their unique key.
6. Buyer gets the download and license information.
7. Your plugin calls your backend/Lemon Squeezy's licensing API when the user activates it.

That last step is important: don't rely solely on a downloadable text file containing a license key if the asset is software. A server-side activation check gives you much better control over revocation, activation limits, refunds, and abuse.

Two alternatives worth considering

Paddle — probably my second choice if the asset is primarily software. Paddle explicitly supports one-time software licenses and digital downloads, and its transaction.completed webhook can trigger your license fulfillment. Paddle Developer Docs Paddle

Gumroad — worth considering if you want the absolute simplest creator storefront and don't need sophisticated licensing. I'd favor Lemon Squeezy/Paddle when license-key management is a core requirement.

My pick

Bottom line: Start with Lemon Squeezy unless you have a specific reason to build the commerce layer yourself. It gets you storefront + checkout + digital delivery + license generation + tax handling in one system, while still giving you an API if you eventually need a custom activation system. Lemon Squeezy Lemon Squeezy Docs

lemonsqueezy.com
docs.lemonsqueezy.com
paddle.com

For one-off digital assets + automatic license-key delivery, my top recommendation is Lemon Squeezy.

Why I’d pick Lemon Squeezy

• One-time purchases: Supports single-payment products, not just subscriptions. docs.lemonsqueezy.com
• Hosted storefront: You can launch a storefront without building the ecommerce infrastructure yourself, while also offering checkout links or embedding checkout on your own site. www.lemonsqueezy.com
• Digital asset delivery: Upload files directly and have customers access them after purchase. www.lemonsqueezy.com
• Automatic license keys: Each purchase can generate a unique key, which is shown in the customer's receipt and order area. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.comsellfy.comwww.lemonsqueezy.com
• License controls: You can specify license duration and activation limits, e.g. one key usable on one machine. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.comsellfy.comwww.lemonsqueezy.com
• API: If your asset is software, you can have your app validate/activate keys against Lemon Squeezy's License API. docs.lemonsqueezy.com
• Customer portal: Buyers can subsequently access their licenses and purchased files without relying solely on the original email. www.lemonsqueezy.com
• Merchant-of-record model: Particularly attractive if you want the platform to handle much of the global sales-tax/VAT complexity rather than building that yourself. www.lemonsqueezy.com

How I'd structure it

For something like a $19–$99 digital asset:

Product page → Lemon Squeezy checkout → payment → license key + download → customer portal

For example, your product could have:

Pro Asset Pack — $49 one time
ZIP download
1 license / 2 activations
Lifetime access to this version
Automatic license key delivery

If you're selling software, I'd go a step further and use the License API so the application itself verifies the key rather than simply putting a key in a PDF/email. Lemon Squeezy supports activation and validation workflows for this. docs.lemonsqueezy.com

One alternative worth considering

Sellfy is worth a look if your priority is a simple creator-oriented storefront for files rather than sophisticated software licensing. It has hosted stores and automatic digital-download delivery, but Lemon Squeezy is the clearer fit when license-key management is a core requirement. sellfy.com

Bottom line: I'd choose Lemon Squeezy for software, plugins, templates with licenses, design assets with entitlement keys, or other downloadable products where you want storefront + payment + file delivery + license generation in one system. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.comsellfy.comwww.lemonsqueezy.com

If you tell me whether the asset is software, a design/template, media, or something else, I can also recommend the best setup and licensing model for it.

For your use case, I’d recommend Lemon Squeezy.

It’s particularly well suited if each purchase is a one-off digital asset + a unique license key, rather than just a downloadable file.

Why Lemon Squeezy fits

• One-time purchases: You can sell products with a single payment rather than a subscription. docs.lemonsqueezy.com
• Hosted storefront: It can provide the storefront itself, so you don't need to build an ecommerce backend. You can also use checkout links/embed checkout on your own site. docs.lemonsqueezy.comwww.lemonsqueezy.com
• Digital file delivery: Upload ZIPs, apps, ebooks, images, etc., and Lemon Squeezy handles secure customer downloads. www.lemonsqueezy.com
• Automatic license keys: Enable license generation on a product/variant and each purchaser gets a unique key in their receipt and order history. docs.lemonsqueezy.com
• License controls: You can specify activation limits and license duration—for example, one asset/license usable on one machine. docs.lemonsqueezy.com
• API + webhooks: If the asset is consumed by your own software, you can integrate license validation into your application and react to purchases, refunds, expirations, etc. docs.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles payment processing and sales-tax/VAT responsibilities as the merchant of record, which is a significant simplification for a small digital-product business. www.lemonsqueezy.com

A good setup

I'd structure each asset like:

Product
→ "Asset X"

Variant
→ Standard License — $29
→ Commercial License — $99
→ perhaps different activation limits

Purchase
→ payment
→ unique license key generated
→ download link delivered
→ receipt emailed

Your application/site
→ accepts the license key
→ calls Lemon Squeezy's licensing API
→ verifies validity/activation status
→ grants access to the asset

That gives you a fairly complete system without having to build payments, file delivery, license generation, and customer receipts yourself.

Runner-up: Gumroad

Gumroad is probably the simpler choice if you're primarily selling creative assets and don't need sophisticated licensing.

Gumroad supports license keys, and customers can receive their key in the receipt/download experience. It also provides an API for verifying keys. gumroad.comgumroad.com

The important distinction is that Gumroad's license enforcement is largely something you implement yourself: Gumroad provides the key and verification API, but your application determines how/when the key is actually enforced. gumroad.comgumroad.com

My pick

Bottom line: if these are things like plugins, software, templates with license restrictions, fonts, 3D assets, or other assets where the license itself matters, I'd start with Lemon Squeezy. If they're mostly downloadable creative files and you want the quickest possible creator storefront, Gumroad is worth considering. www.lemonsqueezy.com

Lemon Squeezy licensing documentation is a good place to look next if you're planning to validate keys from your own application.

For one-off digital assets + automatic license-key delivery, my top pick is Lemon Squeezy.

Why I’d choose Lemon Squeezy

• Built for digital products: upload ZIPs, software, templates, assets, etc., and sell them through a hosted storefront or checkout links. www.lemonsqueezy.com
• Automatic license keys: each purchase can generate a unique key, which the customer receives in their receipt and order area. You can configure license duration and activation limits. docs.lemonsqueezy.comwww.lemonsqueezy.com
• Good for one-time purchases: you can use a single-payment product rather than a subscription. docs.lemonsqueezy.com
• Secure file delivery: their digital-download system uses signed download links and throttling. www.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles sales-tax/VAT responsibilities as the seller of record, which is particularly attractive if you're selling internationally. www.lemonsqueezy.com
• API/webhooks: if your asset is software and you want your app/server to validate keys, there's a License API and webhooks. docs.lemonsqueezy.com
• No monthly fee: its current published pricing is 5% + $0.50 per transaction. www.lemonsqueezy.com

Runner-up: Gumroad

Gumroad is worth considering if you prioritize an extremely simple creator storefront. It supports digital downloads and license keys, and customers can receive keys through receipts/download pages. gumroad.com

The important distinction is that Gumroad leaves license enforcement largely to you: its API lets your application verify keys, but Gumroad doesn't itself enforce how many times your software accepts a key. gumroad.com

My recommendation

For your specific use case, I'd start with Lemon Squeezy. You can essentially have:

Product page → one-time checkout → payment → unique license key + download → your app validates key

without having to build the storefront, payment flow, file delivery, and basic licensing infrastructure yourself. docs.lemonsqueezy.comwww.lemonsqueezy.com

If you're selling software plugins/apps rather than ordinary files, I can also compare Lemon Squeezy against Paddle, Gumroad, Keygen, and Cryptlex specifically for licensing/activation architecture.

For your use case, I’d recommend Lemon Squeezy.

Lemon Squeezy

Why it fits

• One-off digital sales: You can sell individual files/assets with a single payment, rather than requiring subscriptions. docs.lemonsqueezy.com
• Automatic license keys: Each purchase can automatically generate a unique key, which appears in the buyer's receipt and order page. docs.lemonsqueezy.comdocs.lemonsqueezy.comgumroad.com
• License controls: You can specify license duration and activation limits—for example, one activation per customer or three devices. docs.lemonsqueezy.comdocs.lemonsqueezy.comgumroad.com
• Secure asset delivery: It hosts your files and provides customers with download access after purchase; downloads use signed links and rate limiting. www.lemonsqueezy.comwww.lemonsqueezy.com
• Hosted storefront: You don't have to build the ecommerce infrastructure yourself. You can use its storefront, checkout links, or embed checkout into your own site. www.lemonsqueezy.com
• API/webhooks: If your asset is software or your own site needs to verify licenses, there's a License API and webhooks for integrating activation and validation. docs.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles payment processing and sales-tax/VAT obligations as the merchant of record, which can substantially reduce ecommerce plumbing. www.lemonsqueezy.com

Pricing is currently 5% + 50¢ per transaction with no monthly fee, according to its pricing page. www.lemonsqueezy.comwww.lemonsqueezy.com

Runner-up: Gumroad

Gumroad

Gumroad is worth considering if you want an especially creator-friendly storefront. It supports one-time digital products, hosted/embedded stores, and license-key generation. gumroad.com

The distinction I'd make is:

My pick: if "buyer purchases asset → gets download + unique license key → my app/site validates that key" is the core workflow, go with Lemon Squeezy. Its licensing model is designed specifically around this flow. docs.lemonsqueezy.com

If you tell me what kind of digital assets you're selling (software, plugins, templates, 3D assets, fonts, etc.), I can narrow this down further and suggest the ideal checkout + delivery architecture.

For one-off digital assets + automatic license-key delivery, my top pick is Lemon Squeezy.

Why I’d choose Lemon Squeezy

• Built specifically for digital products: upload files such as ZIPs, software, audio, video, ebooks, etc., and deliver them automatically after purchase. www.lemonsqueezy.comdocs.lemonsqueezy.com
• One-time purchases: supports single-payment products, not just subscriptions. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Automatic license keys: it generates a unique key per purchase and can display it in the receipt/order area. docs.lemonsqueezy.com
• License controls: you can set expiration periods and activation limits, e.g. one computer vs. five computers. docs.lemonsqueezy.com
• API/webhooks: if your asset is software, you can have your application validate keys against Lemon Squeezy's License API. docs.lemonsqueezy.com
• Hosted storefront: you don't need to build ecommerce infrastructure yourself; it provides a storefront as well as checkout links/embeds. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles payment/tax responsibilities as the merchant of record, which is particularly attractive if you're selling internationally. www.lemonsqueezy.comdocs.lemonsqueezy.comdocs.lemonsqueezy.com
• Current pricing: its published pricing is 5% + $0.50 per transaction, with no monthly fee. www.lemonsqueezy.com

Runner-up: Gumroad

Gumroad is probably the better choice if you prioritize extreme simplicity and a creator-oriented storefront. It supports one-time digital products and automatically generates license keys; customers can receive keys in their receipt/download page. gumroad.com

The important distinction is that Gumroad's license-key system is primarily designed for software. Its keys don't themselves restrict access to things like audio, video, or ebook files. gumroad.com

My recommendation

For your specific description—one-off assets where each buyer should receive a license key—I'd start with Lemon Squeezy. It gives you the storefront, payment, file delivery, key generation, activation limits, and license API without having to stitch together several services. www.lemonsqueezy.comdocs.lemonsqueezy.comdocs.lemonsqueezy.com

Lemon Squeezy licensing documentation

If you tell me what kind of digital assets you're selling (software, fonts, 3D models, design files, datasets, etc.), I can narrow this down further—especially around license enforcement, piracy protection, and whether you should use Lemon Squeezy vs. Gumroad vs. a custom storefront.

For one-off digital assets + automatic license-key delivery, my first choice is Lemon Squeezy.

Why Lemon Squeezy fits

• Hosted storefront: you can launch a storefront without building ecommerce infrastructure yourself. www.lemonsqueezy.comdocs.lemonsqueezy.com
• One-time purchases: supports single-payment products, variants, and downloadable files. docs.lemonsqueezy.com
• Automatic license keys: it can generate a unique key after purchase, email it to the buyer, and let you control activation limits and license length. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• File delivery: you can upload ZIPs, apps, PDFs, audio, etc., with customers receiving downloads through their purchase/receipt flow. www.lemonsqueezy.com
• License API: if your asset is software, your app can validate, activate, deactivate, and manage keys programmatically. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles payments and sales-tax/VAT responsibilities, which is particularly attractive if you're selling internationally. www.lemonsqueezy.com

The setup I'd use

Lemon Squeezy → Product → one-time price → downloadable asset + license key → buyer receipt

For example:

Photoshop Plugin — $49 one-time
Purchase → ZIP download + XXXX-XXXX-XXXX-XXXX license key
Your plugin calls your backend/Lemon Squeezy API to validate the key.

If you're selling software rather than just files, this is substantially better suited than a generic creator storefront because licensing is a native feature rather than something you'd have to bolt on.

Runner-up: Paddle

Paddle is the other option I'd seriously consider. It supports one-time digital products/software licenses and acts as a Merchant of Record, with APIs and webhooks for custom fulfillment. developer.paddle.com

I'd choose Paddle if you're building a more developer-heavy/software business and expect to need sophisticated checkout, billing, APIs, and global payment infrastructure.

My recommendation:
Lemon Squeezy for a small catalog of one-off digital assets and straightforward license delivery; Paddle if you're building a larger software business around the store.

If you tell me what kind of assets you're selling (plugins, fonts, 3D models, templates, datasets, apps, etc.) and roughly how many products, I can narrow this down to the best 2–3 options and compare their current fees/features.

For your use case, I’d recommend Lemon Squeezy.

It’s particularly well suited if you’re selling one-time digital assets where each purchase should produce a unique license key.

Why Lemon Squeezy fits

• One-off payments: You can sell products with a single upfront charge rather than a subscription. www.lemonsqueezy.comdocs.lemonsqueezy.com
• Automatic license keys: Each buyer can receive a unique key automatically, with configurable license duration and activation limits. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.com
• Digital-file delivery: You can upload the asset directly and Lemon Squeezy handles hosted delivery after purchase. www.lemonsqueezy.com
• Hosted storefront: You can use its storefront directly, or embed/share checkout links from your own site. www.lemonsqueezy.com
• Variants: Useful if you eventually want, say, a Personal license, Commercial license, and 5-seat license under one product. Each variant can have its own price, files, and licensing settings. www.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of record: Lemon Squeezy handles sales-tax/VAT responsibilities as the merchant of record, which is a substantial advantage for selling internationally. www.lemonsqueezy.com
• API/webhooks: If the license needs to be validated by your software, it has a License API and webhooks for integrating purchase/license events into your application. docs.lemonsqueezy.com

Current pricing: Lemon Squeezy lists 5% + $0.50 per transaction, with no monthly fee. www.lemonsqueezy.com

Runner-up: Gumroad

Gumroad is worth considering if simplicity and creator-oriented storefronts are more important than sophisticated licensing.

Gumroad can generate license keys, put them in the buyer's receipt/download experience, and exposes an API for your application to verify them. gumroad.com

The key distinction is that Gumroad leaves license enforcement largely up to you: your application needs to decide how and when a key is verified/revoked. gumroad.com

My pick

Bottom line: If these are things like plugins, apps, templates with license restrictions, fonts, design assets, or other downloadable products where every buyer needs a distinct key, I'd start with Lemon Squeezy. It gives you the storefront + payment + file delivery + license issuance without requiring you to build the ecommerce backend yourself. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.com

If you tell me what kind of digital assets you're selling and roughly how many products/sales you expect, I can also recommend the best architecture (including whether you need a license server of your own).

For one-off digital assets + automatic license-key delivery, my first choice is Lemon Squeezy.

Why I’d pick Lemon Squeezy

• One-time purchases: You can sell individual products with a single payment, rather than requiring subscriptions. docs.lemonsqueezy.com
• Digital-file delivery: Upload your ZIP/PDF/assets directly and customers receive secure download access after purchase. www.lemonsqueezy.com
• License keys are built in: Each purchase can automatically generate a unique key, which appears in the buyer's receipt/order area. You can configure license duration and activation limits. docs.lemonsqueezy.comdocs.lemonsqueezy.comgumroad.com
• Good storefront: It provides a hosted storefront, checkout links, checkout overlays, and custom-domain support, so you don't necessarily need to build an ecommerce backend yourself. www.lemonsqueezy.com
• API/webhooks: If your asset is software or you need your own activation server, Lemon Squeezy provides an API for activating, validating, and managing licenses. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles payment-related tax/VAT responsibilities as the merchant of record, which is particularly useful if you're selling internationally. www.lemonsqueezy.com

A good setup

I'd structure it like:

Your storefront → Lemon Squeezy checkout → payment → automatic delivery

For each product:

1. Upload the digital asset (e.g. product.zip).
2. Enable Generate License Keys.
3. Set activation limit — e.g. 1 for a single-user license.
4. Set license duration — e.g. perpetual, 1 year, etc., depending on your licensing model.
5. Put the license key in the purchase receipt.
6. If it's software, have the app call the Lemon Squeezy License API to activate/validate the key. docs.lemonsqueezy.comdocs.lemonsqueezy.com

Runner-up: Gumroad

Gumroad is worth considering if you prioritize the simplest creator-oriented storefront. It supports digital products and automatically generated license keys, and buyers can retrieve their keys from receipts/download pages. gumroad.com

The important distinction is that Gumroad's license enforcement is largely your responsibility: your application calls its verification API and decides how to enforce the license. gumroad.com

My ranking for your use case:

If these are software/plugins/templates where the license key actually unlocks functionality, I'd go with Lemon Squeezy. If they're mostly files/assets and the key is secondary, Gumroad becomes more compelling.

For one-off digital assets with automatic license-key delivery, I’d generally avoid a generic download store and choose a platform with digital delivery + licensing + payments + tax handling built in.

My top recommendations:

My default recommendation: Lemon Squeezy

For your exact use case, I’d start with Lemon Squeezy:

• Product page/storefront
• Checkout
• Payment processing
• Automatic delivery of files
• License key generation
• Key management (revoke/reissue)
• Support for one-time purchases and subscriptions
• Merchant-of-record tax handling features www.lemonsqueezy.com

A typical flow:

1. Customer buys “Asset X”
2. Payment clears
3. Lemon Squeezy creates a unique license key
4. Buyer receives:
   • download link
   • license key
   • receipt
5. Your app/plugin validates the key through your licensing endpoint

If you need more control

A more developer-oriented stack:

• Frontend: your own website
• Payments: Stripe Checkout
• Licensing: your own API/database or a license-management service
• Delivery: object storage (S3/R2/etc.)

This gives you ownership of the customer experience, but you take on:

• tax compliance
• fraud handling
• email delivery
• license infrastructure

What I would choose by product type

• WordPress plugins, desktop apps, SaaS tools: Lemon Squeezy
• Fonts, icons, 3D models, design packs: Lemon Squeezy or Gumroad
• Courses, PDFs, small creator products: Gumroad or Payhip
• Large catalog + branding requirements: Shopify + a licensing add-on

If you tell me what the assets are (software licenses, game keys, art packs, CAD files, templates, etc.) and whether buyers need activation limits/device tracking, I can narrow this down further.

For one-off digital assets + automatic license-key delivery, my top recommendation is Lemon Squeezy.

Why Lemon Squeezy fits

• One-time purchases: You can sell individual products with a single payment rather than subscriptions. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Automatic license keys: Each purchase can generate a unique key, with configurable license duration and activation limits. docs.lemonsqueezy.comdocs.lemonsqueezy.comgumroad.com
• Digital file delivery: Upload ZIPs, apps, PDFs, audio, etc., and Lemon Squeezy handles customer delivery. www.lemonsqueezy.com
• Hosted storefront: You get a storefront without having to build ecommerce infrastructure yourself, while also having the option to use checkout links/embeds on your own site. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles sales-tax/VAT obligations as part of its MoR model, which is particularly useful if you're selling internationally. www.lemonsqueezy.com
• API/webhooks: If your asset is software, you can validate keys from your application and react to events such as purchases, refunds, or license changes. docs.lemonsqueezy.com
• Pricing: Its current listed standard transaction fee is 5% + $0.50, with no monthly platform fee. www.lemonsqueezy.com

A good alternative: Gumroad

Gumroad is worth considering if you prioritize an extremely simple creator storefront. It also supports automatic license keys and provides a license-verification API. gumroad.com

The important distinction is that Gumroad's license enforcement is largely up to you: your application needs to call its verification API and decide how to enforce activations/revocations. gumroad.com

My pick

I'd choose Lemon Squeezy if you're selling things like plugins, templates, fonts, creative assets, desktop software, or other downloadable products where every buyer should receive both the asset and a unique license key.

A particularly clean setup would be:

Storefront → Lemon Squeezy checkout → payment → automatic license key + download → your app/site validates key via Lemon Squeezy API.

Lemon Squeezy licensing documentation 

For your use case, I’d recommend Lemon Squeezy.

It’s particularly well suited if each purchase is essentially “one digital asset + one license key.”

Why Lemon Squeezy fits

• One-off purchases: You can sell products with a single upfront charge, not just subscriptions. docs.lemonsqueezy.com
• Automatic license keys: Enable license generation per product/variant; a unique key is generated for each buyer and included in their receipt. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Activation limits: You can specify license length and the number of activations allowed. docs.lemonsqueezy.comwww.lemonsqueezy.com
• Digital-file delivery: Upload your ZIP/app/assets directly and Lemon Squeezy handles secure delivery after purchase. docs.lemonsqueezy.comwww.lemonsqueezy.comdocs.lemonsqueezy.comdocs.lemonsqueezy.com
• Hosted storefront: It gives you a ready-made storefront, while also allowing checkout links or embedded checkout on your own site. docs.lemonsqueezy.com
• License API/webhooks: If your asset is software, your application can validate licenses and respond to activation/deactivation events programmatically. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of record: Lemon Squeezy handles payment/tax responsibilities as the merchant of record, which can substantially simplify selling internationally. www.lemonsqueezy.com

A good alternative: Gumroad

Gumroad is arguably simpler if you just want to get a storefront online quickly. It also supports generated license keys, multi-seat licenses, and an API for verifying keys. gumroad.com

The important distinction is that Gumroad's license system is primarily designed for software; its license keys don't themselves restrict access to things like audio, video, or ebook files. gumroad.com

My pick

Bottom line: I'd start with Lemon Squeezy unless you specifically want Gumroad's creator-centric ecosystem. It gives you the cleanest combination of storefront, one-time payments, file delivery, and actual license management without having to stitch together several services. docs.lemonsqueezy.comwww.lemonsqueezy.com

If your “digital assets” are things like Figma templates, Photoshop files, 3D models, plugins, fonts, or downloadable software, the best choice can differ slightly—especially depending on whether the license needs to be enforced inside an application.

For your use case, I’d pick Lemon Squeezy.

It’s unusually well matched to one-off digital products + automatic license-key delivery:

• One-time purchases: You can sell individual assets/products without subscriptions. docs.lemonsqueezy.comwww.lemonsqueezy.com
• Hosted storefront: It provides a customizable storefront, so you don't need to build checkout infrastructure yourself. www.lemonsqueezy.com
• Digital file delivery: Upload ZIPs, apps, ebooks, audio, etc., and customers can access them after purchase. docs.lemonsqueezy.comwww.lemonsqueezy.com
• Automatic license keys: Enable license generation on a product/variant; a unique key is generated for each purchase and delivered in the customer's receipt. docs.lemonsqueezy.com
• Activation limits: You can specify license length and activation limits, and use its License API to validate/revoke keys. docs.lemonsqueezy.comdocs.lemonsqueezy.com
• Merchant of record: Lemon Squeezy handles payments, sales tax/VAT, and related compliance, which is particularly useful if you're selling internationally. www.lemonsqueezy.com
• No monthly platform fee: Its current pricing page advertises $0/month, with transaction-based pricing. www.lemonsqueezy.com

How I'd structure it

Storefront → Product page → Checkout → Automatic fulfillment

For each asset, create a product with:

1. Product description/screenshots
2. One-time price
3. Downloadable ZIP/file
4. Generate license keys enabled
5. Appropriate activation limit
6. Optional custom confirmation/download instructions

After payment, the buyer gets the asset and license key automatically. If the asset is software, your app can call the Lemon Squeezy License API when the user activates it. docs.lemonsqueezy.comdocs.lemonsqueezy.com

Alternatives

Gumroad is the easiest competitor if you want maximum simplicity. It also has native license keys and an API for verification/revocation. gumroad.com The downside is that its license system is more creator-oriented: you determine enforcement based on verification calls, rather than getting as much licensing infrastructure built around the product. docs.lemonsqueezy.comwww.lemonsqueezy.comwww.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.comgumroad.com

Paddle is my pick if you're building something more software-company-like. It supports one-time software licenses and digital downloads, provides webhooks for fulfillment, and acts as merchant of record. developer.paddle.com It's more developer/integration-oriented than Lemon Squeezy.

My ranking for your specific requirement:

Bottom line: Start with Lemon Squeezy unless you specifically need a highly customized checkout/licensing architecture. It gives you the shortest path from “I have a digital asset” to “customer paid, downloaded it, and received a usable license key.”

For your use case, I’d pick Lemon Squeezy.

It’s particularly well suited if “one-off digital assets” means things like software, plugins, templates, fonts, design assets, or downloadable files where each purchase should generate a license key.

Why Lemon Squeezy

• Hosted storefront: You can launch a standalone storefront without building your own ecommerce backend. www.lemonsqueezy.comdocs.lemonsqueezy.com
• One-time purchases: Products can be sold as one-off purchases, with variants for different editions or license tiers. www.lemonsqueezy.comdocs.lemonsqueezy.com
• Automatic license keys: Enable licensing on a product/variant and Lemon Squeezy generates a unique key for each purchase. docs.lemonsqueezy.com
• Activation limits: You can specify license length and activation limits, which is useful for software or other assets where you don't want unlimited sharing. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.com
• Digital delivery: Upload files directly and have them delivered to customers after purchase. www.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.comdocs.lemonsqueezy.comgumroad.com
• API/webhooks: If you're selling software, you can have your application validate keys against their licensing API and respond to purchases, refunds, expirations, etc. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.com
• Merchant of Record: Lemon Squeezy handles payment/tax responsibilities as the merchant of record, which considerably reduces the infrastructure you'd otherwise need to build. www.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.comdocs.lemonsqueezy.comgumroad.com

The main alternative: Gumroad

Gumroad is probably the easiest alternative. It also has a hosted storefront, digital delivery, and built-in license keys with an API for verification. gumroad.com

I'd choose:

My recommendation: start with Lemon Squeezy unless you specifically want Gumroad's creator-oriented ecosystem. You can have a setup like:

Storefront → Checkout → Payment → License generated → Customer receives key + download → Your app validates key via API

That gives you a fairly complete solution without having to build payments, file delivery, licensing, and tax infrastructure yourself. docs.lemonsqueezy.comdocs.lemonsqueezy.comwww.lemonsqueezy.com

Lemon Squeezy licensing documentation