ChatGPT answers, unedited

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