ChatGPT answers, unedited

For a solo developer building a headless storefront for digital downloads, I’d usually narrow it to:

1. Lemon Squeezy — simplest “developer-first” option
2. Stripe — best API, but more work
3. Gumroad — simplest selling flow, weaker headless experience
4. Paddle — good if you need merchant-of-record SaaS billing

My pick for a solo dev: Lemon Squeezy. Lemon Squeezy Docs Lemon Squeezy Docs

Why Lemon Squeezy fits a headless digital-download storefront

You can keep your own frontend (Next.js, Astro, Remix, etc.) and let Lemon Squeezy handle the hard commerce pieces:

• Product catalog
• Checkout
• Payment processing
• Digital file delivery
• Taxes/VAT handling
• Customer/order records
• Webhooks for fulfillment flows

Its API is relatively small: create products in the dashboard, generate checkout links, listen for purchase events, then unlock downloads in your app. The API uses standard HTTP requests and webhooks, though it follows JSON:API conventions, which adds a little verbosity. Lemon Squeezy Docs Lemon Squeezy Docs

A typical architecture:

Your storefront
      |
      |  "Buy" button
      ↓
Lemon Squeezy checkout
      |
      | webhook: order_created
      ↓
Your backend
      |
      ↓
Grant download access

When I would choose something else

My rough decision guide

• Selling PDFs, templates, assets, ebooks, courses: Lemon Squeezy or Gumroad
• Selling a developer tool, plugin, app license, or SaaS add-on: Lemon Squeezy
• Building a serious commerce platform: Stripe
• Want the fastest MVP with your own frontend: Lemon Squeezy

For a solo developer, I’d avoid building a full cart/order system unless commerce itself is your product. A lightweight stack like:

• Next.js frontend
• Lemon Squeezy checkout
• Your database for users + entitlements
• Webhooks for fulfillment

is usually the lowest-maintenance path. Lemon Squeezy Docs Lemon Squeezy Docs

If you tell me your stack (Next.js? Laravel? Rails? Svelte?) and whether you need one-time downloads vs subscriptions/licenses, the recommendation may change.

For a solo developer building a headless storefront for digital downloads, I’d look first at Lemon Squeezy if your priority is minimum integration complexity. Its model maps neatly to a custom frontend: create products/variants, generate a checkout URL or checkout via API, then use webhooks to provision the download/access after purchase. Lemon Squeezy Docs Lemon Squeezy Docs Lemon Squeezy Docs

How I’d compare the main options

Why Lemon Squeezy is particularly attractive: its docs explicitly support hosted or overlay checkout, while also letting you create fully customized checkout experiences through the API. Lemon Squeezy Docs You can attach your own user/order identifier as custom checkout data and receive it back in webhooks, which is convenient for connecting purchases to users in your own database. Lemon Squeezy Docs

The webhook side is also fairly clean: events such as order_created and license_key_created arrive as JSON POSTs, with signature validation available. Lemon Squeezy Docs Lemon Squeezy Docs

Paddle is a strong alternative if you expect more sophisticated billing requirements. Its current API revolves around products, prices, transactions and checkout, and its JavaScript checkout can be driven directly from your frontend. Paddle Developer Docs Paddle Developer Docs It also handles payments, tax and compliance as a Merchant of Record. Paddle Developer Docs The tradeoff is that there's somewhat more conceptual machinery than you need for a simple download shop.

My practical recommendation

For a solo developer, I'd structure it roughly:

Your frontend → Lemon Squeezy checkout → webhook → your DB → your download authorization

That keeps payment/tax/order infrastructure out of your codebase while letting you own the actual storefront UX.

If you tell me your stack (e.g. Next.js + Supabase, Astro, Laravel, etc.), I can also compare Lemon Squeezy vs Paddle vs Stripe specifically for that stack, including the approximate amount of code each integration requires.

Lemon Squeezy is probably the simplest fit for a solo developer building a headless digital-download storefront.

• API/SDK: straightforward REST API + JS tooling.
• Headless: easy to keep your own frontend while using hosted/overlay checkout.
• Digital downloads: built-in file delivery and license keys.
• Tax: Merchant of Record handles VAT/sales tax, a big win for a solo dev.
• Webhooks: enough to sync purchases into your own database/access system. lemonsqueezy.com creatorstackclub.com

Paddle is the better choice if you anticipate more sophisticated billing or scaling, but its setup/API ecosystem is heavier. developer.paddle.com

So for “I want the least code and operational headache” → Lemon Squeezy.

For a solo developer building a headless storefront for digital downloads, I’d rank them roughly like this:

Lemon Squeezy Docs LemonSqueezy## My recommendation: Lemon Squeezy for most solo devs

For a headless storefront, Lemon Squeezy is probably the sweet spot:

• Create products in the dashboard.
• Your frontend (Next.js, Remix, Astro, etc.) fetches product data or creates checkout links.
• Use webhooks to unlock downloads after payment.
• They handle tax/VAT complexity as a merchant of record.
• The API model is straightforward REST + webhooks. Lemon Squeezy Docs Lemon Squeezy Docs

A typical stack:

Next.js storefront
        |
        | API
        v
Lemon Squeezy
        |
        | webhook: order paid
        v
Your database
        |
        v
Signed download URL

That lets you avoid building:

• payment flows
• invoices
• tax calculations
• refund handling
• download delivery security

LemonSqueezy## When I would choose Stripe instead

Pick Stripe if your product is more like:

• "I am building my own Shopify/Gumroad competitor"
• complex pricing logic
• custom customer accounts
• marketplace payouts
• deep analytics
• full ownership of checkout UX

Stripe has arguably the cleanest developer ecosystem, but you become responsible for more pieces.

When I would choose Gumroad

Use Gumroad if your goal is:

"I want to sell a PDF/template/course this weekend."

It is extremely simple, but it is less attractive if your storefront itself is a product you are engineering. CreatorStackClub

My default solo-dev stack

For a modern digital-download storefront:

• Frontend: Next.js
• Auth: Auth.js / Clerk / Supabase Auth
• Database: Postgres + Prisma
• Payments: Lemon Squeezy
• Files: Cloudflare R2 or AWS S3
• Emails: Resend
• Analytics: PostHog

You get a custom branded storefront while outsourcing the painful commerce pieces.

If you’re selling ebooks/assets/templates, I’d lean Lemon Squeezy or Gumroad. If you’re selling software downloads with license keys, I’d strongly lean Lemon Squeezy because its API also covers license-related workflows. Lemon Squeezy Docs

If your priority is the simplest API + developer experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — best fit

• Designed around digital products, downloads, licenses, subscriptions, and checkout.
• REST API + webhooks.
• Official TypeScript/JavaScript SDK.
• Merchant-of-record, so you don't have to build as much tax/VAT infrastructure yourself.
• You can keep your own frontend entirely headless and use Lemon Squeezy for commerce/checkout. Lemon Squeezy Docs Lemon Squeezy Docs GitHub
• Dev experience: 9/10
• Stripe — best if you want maximum control

• Excellent API and probably the strongest developer ecosystem.
• Stripe Checkout is deliberately low-code and works well with a headless frontend. Stripe Docs
• But for a digital-download store, you'll end up assembling more pieces yourself: fulfillment/download access, tax considerations, product logic, etc.
• Dev experience: 8/10, but more engineering overall.
• Gumroad — simplest non-technical setup

• Fantastic if you're essentially selling files and don't care much about owning the commerce architecture.
• Less attractive if you're specifically building a custom headless storefront and want your backend to have a clean commerce API.
• Dev experience for headless: ~6/10

What I'd use

For something like:

Next.js / React storefront
        ↓
Your API / server actions
        ↓
Lemon Squeezy
        ↓
Checkout
        ↓
Webhook
        ↓
Your DB → grant download access

Lemon Squeezy is particularly appealing because its API already exposes products, files, orders, customers, discounts, checkouts, and webhooks, rather than making you construct the whole digital-goods layer yourself. Lemon Squeezy Docs

One caveat: Lemon Squeezy's API follows JSON:API, so it's not literally the simplest REST API imaginable—you have to deal with JSON:API headers and conventions. Lemon Squeezy Docs

If you're comfortable building the download entitlement layer yourself and want the cleanest/general-purpose API, I'd choose Stripe. If you want the least code to get a polished digital-download business running, I'd choose Lemon Squeezy.

docs.lemonsqueezy.com
docs.stripe.com

If you tell me whether you're using Next.js, Astro, Nuxt, SvelteKit, or something else, I can recommend the exact stack and show what the purchase → webhook → download flow would look like.

If your priority is the simplest API + best solo-developer experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — best overall

• Straightforward REST API with predictable resource URLs.
• Products, files, orders, customers, checkouts, discounts, and license keys are all exposed through the API. Lemon Squeezy Docs Lemon Squeezy Docs
• Hosted checkout or checkout overlay means you don't have to build payment infrastructure yourself, while still allowing a fully custom headless storefront. Lemon Squeezy Docs
• Webhooks let your backend react to successful purchases and deliver access/downloads. Lemon Squeezy Docs
• Test mode covers checkout, API, and webhooks, which is particularly nice when you're building alone. Lemon Squeezy Docs
• It also handles merchant-of-record responsibilities, so you don't have to build your own global sales-tax machinery.
• Gumroad — simplest if you barely need an API

• Excellent if you're essentially selling a handful of files and want the platform to do almost everything.
• I'd choose it over Lemon Squeezy if your priority were "get a product online with almost no engineering."
• For a genuinely headless storefront, though, I think Lemon Squeezy gives you a better foundation.
• Paddle — powerful, but more infrastructure than you need

• Good choice if you're building something closer to SaaS/B2B commerce.
• For a solo developer selling downloadable products, its additional capabilities generally aren't worth the extra complexity.

For your architecture

I'd keep it very small:

Next.js/your frontend → your API/server → Lemon Squeezy → webhook → your DB

Your storefront owns the product pages and UX. Lemon Squeezy owns checkout, payment, tax, order processing, and file delivery. Your webhook records the purchase and grants the customer whatever access your app needs.

One caveat: Lemon Squeezy's underlying API is JSON:API, so it isn't literally the simplest possible REST interface. Lemon Squeezy Docs But for the complete workflow you're describing, the amount of infrastructure you don't have to build makes the overall developer experience very simple.

Bottom line: for a solo dev building a custom/headless digital-download store, I'd start with Lemon Squeezy. Lemon Squeezy Docs

docs.lemonsqueezy.com

If you tell me your stack (e.g. Next.js + Supabase, Astro, Laravel, etc.), I can also compare Lemon Squeezy vs Stripe vs Paddle vs Gumroad specifically for your architecture.

If your priority is the simplest API + lowest integration overhead as a solo developer, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — simplest overall

• Very straightforward REST API.
• Built specifically around digital products, downloads, licenses, checkout, and webhooks.
• You can start with a hosted checkout URL and only add API complexity where you need it. Lemon Squeezy Docs Lemon Squeezy Docs
• Its API covers products, files, orders, checkouts, and webhooks, so you don't have to stitch together multiple services. Lemon Squeezy Docs
• Particularly nice for a headless storefront: your frontend can own the product/catalog UI while Lemon Squeezy handles checkout/payment/tax.
• Paddle — best if you're building for scale

• Excellent API and documentation, with a very polished developer experience. Paddle Developer Docs Paddle Developer Docs
• Stronger platform if you expect subscriptions, complex pricing, internationalization, etc.
• For digital downloads, the basic flow is still clean: product → one-time price → Paddle Checkout → transaction.completed webhook → grant download. Paddle Developer Docs
• But there's more conceptual machinery than you need for a simple indie storefront.

What I'd build

For a solo headless store, I'd keep your architecture roughly:

Your storefront
      │
      ├── Product/catalog data ──→ your DB/CMS
      │
      └── Buy button
             │
             ↓
       Lemon Squeezy
       hosted checkout
             │
             ↓
        webhook
             │
             ↓
       Your backend
             │
             ↓
       Grant download

The particularly nice part is that you don't need to build payments or checkout yourself. Lemon Squeezy can generate a checkout URL through a single API call, and you can redirect the customer to it. Lemon Squeezy Docs Lemon Squeezy Docs

Bottom line: for a solo developer selling PDFs, templates, ebooks, assets, plugins, etc., I'd choose Lemon Squeezy unless you have a specific reason to want Paddle's more extensive billing infrastructure.

docs.lemonsqueezy.com

If you tell me your stack (e.g. Next.js + Vercel + Supabase), I can also sketch the minimal headless architecture and API calls I'd use.

If your priority is the simplest API + developer experience for a solo-built headless storefront selling digital downloads, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — best overall

• Very straightforward REST API.
• Official JavaScript SDK.
• Hosted checkout or checkout overlay, so you don't have to build payment UI.
• Webhooks for order_created, refunds, customers, license keys, etc.
• Handles taxes/VAT as a merchant of record.
• Designed around digital products, downloads, licensing, and subscriptions. Lemon Squeezy Docs Lemon Squeezy Docs
• You can pass your own user/session ID through checkout and receive it back in the webhook, which is particularly nice for a headless storefront. Lemon Squeezy Docs
• Gumroad — simplest if you want minimal backend

• The API is quite approachable, and for your own Gumroad account you can simply generate an access token. Gumroad
• But it's less attractive if you're building a deeply customized/headless commerce experience where your storefront is the primary product.
• Paddle — powerful, but more machinery

• Excellent for SaaS/digital products and tax compliance.
• Its API is more extensive and structured around catalog/product/transaction concepts. For example, creating a product requires several catalog/tax fields. Paddle Developer Docs
• I'd choose it when Paddle's broader billing infrastructure is more important than minimizing implementation complexity.

What I'd build

For a Next.js/React-style headless storefront, I'd make the architecture roughly:

Your storefront
     │
     ├── Product catalog ──→ Lemon Squeezy API
     │
     ├── Buy button ───────→ Lemon Squeezy checkout
     │
     └── Your /api/webhook
              │
              └── order_created
                    ↓
                 Your DB
                    ↓
              grant download

The particularly nice part is that you don't need to build payments, checkout, tax calculation, receipts, or download fulfillment from scratch. Lemon Squeezy can give you a checkout URL, and your backend mainly needs to listen for the successful purchase webhook. Lemon Squeezy Docs Lemon Squeezy Docs

For a solo developer, I'd therefore choose Lemon Squeezy unless you have a specific reason to own the entire commerce/payment layer.

docs.lemonsqueezy.com docs.lemonsqueezy.com

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

1. Lemon Squeezy — simplest

• Straightforward REST API with predictable resources and JSON responses. Lemon Squeezy Docs
• Very simple checkout model: your storefront can send users to a hosted/overlay checkout, while your backend listens for order_created and related webhooks. Lemon Squeezy Docs Lemon Squeezy Docs
• Custom data can be attached to checkout and returned in webhooks, which is particularly useful for mapping a purchase to your own user/order IDs. Lemon Squeezy Docs
• Handles digital products, payments, tax, and merchant-of-record responsibilities, so there's less infrastructure for you to build.
• Official JS SDK available. Lemon Squeezy Docs
• Paddle — best if you expect to grow into a larger SaaS

• Excellent developer tooling and a polished API.
• Supports one-time digital products and downloads, with checkout → transaction.completed → fulfillment being a clean architecture. Paddle Developer Docs
• But its product/price/transaction model is somewhat more elaborate than you need for a small download store. Paddle Developer Docs
• Great choice if subscriptions, multiple price points, localization, and sophisticated billing are likely later.
• Gumroad — simplest business setup, but less attractive for a headless architecture

• I'd choose it if your priority is "upload product, get a checkout, start selling" rather than building a deeply integrated custom storefront.
• For a developer-controlled headless storefront, I'd rather have Lemon Squeezy's API/webhook model.

What I'd build

For a Next.js/React-style headless storefront, the architecture I'd use is:

Your storefront
      │
      ├── Product/catalog data
      │
      └── "Buy" → Lemon Squeezy checkout
                         │
                         ▼
                    Customer pays
                         │
                         ▼
                  Lemon Squeezy webhook
                         │
                         ▼
                 Your API / database
                         │
                         ▼
                Grant download access

That keeps payment/tax/compliance out of your code, while your application remains the source of truth for the customer experience and download authorization.

Bottom line: if your criterion is specifically "I want to spend the least amount of time fighting the commerce API" → Lemon Squeezy. If you expect the project to evolve substantially toward SaaS/subscriptions → Paddle is worth the extra complexity.

docs.lemonsqueezy.com developer.paddle.com

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall developer experience.

My ranking

1. Lemon Squeezy — simplest

• REST API with predictable resource URLs and JSON:API responses.
• First-class products, files, checkouts, orders, customers, discounts, and webhooks.
• Official JavaScript SDK.
• Merchant of record, so it handles sales tax/VAT for you.
• Particularly well suited to digital products and downloads. Lemon Squeezy Lemon Squeezy
• Paddle — best alternative

• Also a merchant of record and explicitly supports digital downloads.
• Very capable API and modern SDKs.
• More elaborate product/price/transaction model, though, so I'd expect a little more integration work for a tiny storefront. Paddle Developer Docs Paddle Developer Docs
• Stripe — best if you want maximum flexibility

• Excellent APIs and arguably the best general developer tooling.
• Checkout can be extremely simple: create a Checkout Session and redirect/embed it.
• But Stripe is fundamentally a payments platform, so you'll be building more of the digital-download/catalog/fulfillment layer yourself. Stripe Docs Stripe Docs

What I'd use

For a storefront like:

Next.js → your product pages → Lemon Squeezy checkout → webhook → grant download → customer

I'd choose Lemon Squeezy. Its API directly models the things a digital-download business needs, rather than making you assemble them from a generic payments API. Lemon Squeezy Lemon Squeezy

If "simplest API" is your #1 criterion, Lemon Squeezy wins. If "most future-proof/general-purpose payments infrastructure" is the priority, I'd choose Stripe. If you want merchant-of-record + a more enterprise-oriented platform, I'd look at Paddle.

docs.lemonsqueezy.com · developer.paddle.com · docs.stripe.com

If your priority is the simplest API + lowest implementation burden as a solo developer, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — best overall for your use case

• REST API with straightforward bearer-token auth.
• Products, files, orders, customers, checkouts, and license keys are already modeled for you. Lemon Squeezy Docs Lemon Squeezy Docs
• You can create a checkout from your headless frontend with a single API operation, while Lemon Squeezy handles payment and delivery infrastructure. Lemon Squeezy Docs Lemon Squeezy Docs
• Webhooks give you order_created, refunds, license events, etc., so your backend only needs to synchronize the state you actually care about. Lemon Squeezy Docs
• You can attach your own user_id or other metadata to a checkout and get it back in the webhook—very useful for a headless storefront. Lemon Squeezy Docs
• There's an official JavaScript SDK as well. Lemon Squeezy Docs
• Gumroad — simplest if you barely need an API

• Very easy if your storefront can mostly link out to Gumroad.
• But it's less attractive when you're building a genuinely headless experience and want your own product/catalog/order model.
• Its license API is particularly geared toward software licensing rather than controlling access to ordinary digital downloads. Gumroad
• Stripe — most flexible, but more work

• I'd choose Stripe if you expect unusual checkout logic, complex pricing, subscriptions, or eventually want to own much more of the commerce stack.
• For a solo developer selling PDFs, assets, templates, courses, etc., you're taking on more plumbing than you need.

What I'd build

For a headless digital-download store, I'd make the architecture roughly:

Your storefront
      ↓
Your API / server action
      ↓
Lemon Squeezy checkout
      ↓
Customer pays
      ↓
Lemon Squeezy webhook
      ↓
Your database
      ↓
Grant customer access to download

The important part is that Lemon Squeezy remains the payment/commerce system, while your application owns the storefront UX and customer authorization.

That gives you a surprisingly small backend: create checkout → receive order_created → record purchase → authorize download.

So if “I want to ship this alone without building an ecommerce company by accident” is the goal, I'd start with Lemon Squeezy. docs.lemonsqueezy.com

If you tell me your stack (e.g. Next.js + Supabase, Astro, Laravel, etc.), I can also compare Lemon Squeezy vs Stripe vs Gumroad specifically for that stack, including what the actual integration code would look like.

For a solo developer building a headless storefront for digital downloads, I’d usually rank the options like this for simplicity of API + speed to ship:

My pick: Lemon Squeezy

For a solo-built headless download store, Lemon Squeezy is probably the lowest-friction choice:

• Create products in the dashboard.
• Use your own frontend (Next.js, Remix, Astro, etc.).
• Generate checkout links through a simple API.
• Receive webhooks after purchase.
• Deliver files or unlock content yourself.
• Avoid building tax/VAT handling and payment flows. Lemon Squeezy Docs Lemon Squeezy Docs

The mental model is simple:

Your frontend
     |
     |  "Buy this PDF"
     ↓
Lemon Squeezy checkout
     |
     | webhook: payment completed
     ↓
Your backend
     |
     ↓
Give customer download access

Their API is REST-based and covers products, orders, checkouts, files, customers, and webhooks. Lemon Squeezy Docs

When I would choose Stripe instead

Pick Stripe if you expect to need:

• custom checkout UI
• complex pricing
• subscriptions with unusual rules
• usage-based billing
• marketplace features
• deep payment customization

Stripe’s developer tooling is excellent, but you’ll assemble more pieces yourself: checkout, tax, customer portal, file delivery logic, webhook handling, etc.

When I would choose Gumroad

Pick Gumroad if your priority is:

“I want a buy button and a download link with almost no engineering.”

It is less attractive if your goal is a polished custom headless storefront where your app owns the customer experience.

A practical solo-dev stack

For a modern digital download store, I’d probably build:

• Frontend: Next.js / Astro
• CMS: optional (Sanity, Contentful, or just your database)
• Payments + tax + checkout: Lemon Squeezy
• Database: Postgres/Supabase
• File storage: S3/R2
• Auth: Clerk/Auth.js/Supabase Auth
• Emails: Resend/Postmark

That gives you a custom storefront without spending weeks rebuilding commerce infrastructure.

If the product is ebooks/templates/assets, I’d lean Lemon Squeezy. If it’s a SaaS product with subscriptions, I’d compare Lemon Squeezy vs Stripe more carefully.

A practical solo-dev stack

For a modern digital download store, I’d probably build:

• Frontend: Next.js / Astro
• CMS: optional (Sanity, Contentful, or just your database)
• Payments + tax + checkout: Lemon Squeezy
• Database: Postgres/Supabase
• File storage: S3/R2
• Auth: Clerk/Auth.js/Supabase Auth
• Emails: Resend/Postmark

That gives you a custom storefront without spending weeks rebuilding commerce infrastructure.

If the product is ebooks/templates/assets, I’d lean Lemon Squeezy. If it’s a SaaS product with subscriptions, I’d compare Lemon Squeezy vs Stripe more carefully.

If you mean which platform to use as the commerce/payment backend for a custom headless digital-download storefront, I’d pick Lemon Squeezy for a solo developer.

Why Lemon Squeezy

• Very little backend to build. It handles checkout, payments, taxes, receipts, and digital-product delivery infrastructure, while your storefront can remain completely custom.
• Straightforward REST API. Products, variants, files, orders, customers, checkouts, and webhooks are exposed through a conventional API. Lemon Squeezy Docs Lemon Squeezy Docs
• Simple headless flow: your frontend → your backend → create Lemon Squeezy checkout → redirect/overlay → webhook → grant download access.
• Custom checkout data. You can pass your own user_id, session ID, etc. through checkout and receive it back in webhook data, which is particularly useful for connecting purchases to your own database. Lemon Squeezy Docs Lemon Squeezy Docs
• Good JavaScript support. There's an official JS SDK, plus Lemon.js for checkout overlays. Lemon Squeezy Docs
• Test mode lets you exercise the integration without building your own payment sandbox. Lemon Squeezy Docs

The basic checkout integration can be remarkably small:

Product page
    ↓
POST /api/checkout
    ↓
Lemon Squeezy API
    ↓
checkout URL
    ↓
Customer pays
    ↓
Webhook
    ↓
Your DB: purchase → user → download entitlement

The API does use JSON:API, so it's not the absolute simplest API ergonomically—there are more nested data / attributes / relationships objects than you'd get from something like Stripe. Lemon Squeezy Docs But for a solo developer, I'd consider that a worthwhile tradeoff because you're outsourcing a lot of commerce complexity.

My ranking for your specific use case:

1. 🥇 Lemon Squeezy — best balance of simplicity + digital products + headless + merchant-of-record
2. Gumroad — arguably simpler conceptually, but less attractive if you're building a deeply custom storefront
3. Stripe — excellent developer experience, but you'll end up building substantially more of the digital-commerce machinery yourself

If your priority is "I want to own the storefront UX but spend the absolute minimum time building commerce infrastructure," Lemon Squeezy is the one I'd start with.

docs.lemonsqueezy.com docs.lemonsqueezy.com

If your priority is the simplest API + lowest solo-developer overhead for a headless digital-download storefront, I’d pick Lemon Squeezy.

Why Lemon Squeezy

• Headless-friendly: you can keep your own storefront/UI and use Lemon Squeezy only for commerce. Its API covers products, customers, orders, files, discounts, payments, and licenses. Lemon Squeezy Docs
• Very simple checkout integration: create a checkout for a product variant via POST /v1/checkouts, then send the customer to the returned checkout URL—or use its checkout overlay. Lemon Squeezy Docs Lemon Squeezy Docs
• Webhooks are straightforward: events arrive as JSON POSTs, with signed requests, and you can associate your own user_id/custom data with purchases. Lemon Squeezy Docs Lemon Squeezy Docs
• Digital products are first-class: file management, downloads, licensing, receipts, etc. are already part of the platform rather than things you have to build yourself. Lemon Squeezy Docs
• Good solo-dev testing workflow: Test mode gives you a separate store/data set and lets you test purchases and webhooks before going live. Lemon Squeezy Docs
• Tax/VAT burden is reduced: Lemon Squeezy acts as merchant of record, which is particularly attractive if you're a one-person operation. Lemon Squeezy Docs

My rough ranking

The key distinction is Stripe vs. Lemon Squeezy: Stripe's API is arguably cleaner and more powerful, but you'd be assembling substantially more of the digital-product infrastructure yourself. For a solo developer, Lemon Squeezy lets you concentrate on the storefront rather than payments, tax, fulfillment, receipts, and licensing.

Recommended architecture:
Your Next.js/React storefront → Lemon Squeezy checkout → webhook → your DB → gated download

That gives you a genuinely headless frontend while keeping the complicated commerce plumbing off your plate. Lemon Squeezy Docs Lemon Squeezy Docs

docs.lemonsqueezy.com

If you tell me whether you're selling one-off PDFs/assets, software licenses, or subscriptions, I can narrow this down between Lemon Squeezy, Gumroad, Paddle, and Stripe.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

Why Lemon Squeezy: its basic integration can literally be a checkout URL for a product/variant, with your backend primarily listening for webhooks after purchase. You can also create checkouts through the API when you need dynamic behavior. Lemon Squeezy Docs Lemon Squeezy Docs

It also supports passing your own data—e.g. user_id or download_id—through checkout and receiving it back in webhook events, which is particularly convenient for a headless storefront. Lemon Squeezy Docs

docs.lemonsqueezy.com

When I'd choose Paddle instead

Paddle is my second choice, and I'd choose it if you expect the business to become more sophisticated. It has a very good checkout experience and explicitly supports one-time digital downloads, while handling payments, tax, fraud, and merchant-of-record responsibilities. Paddle Developer Docs Paddle Developer Docs

The downside for a tiny storefront is that Paddle exposes a somewhat larger conceptual model—products, prices, transactions, customers, addresses, etc. Paddle Developer Docs Paddle Developer Docs

developer.paddle.com

The architecture I'd use

For your use case, I'd keep it extremely thin:

Your frontend
    │
    ├── Product catalog → your DB/CMS
    │
    └── Buy button
          │
          ▼
    Lemon Squeezy checkout
          │
          ▼
       Payment
          │
          ▼
    Webhook → your API
          │
          ▼
    Grant download entitlement
          │
          ▼
    Your private file storage

That lets your app own the storefront/UI/catalog, while Lemon Squeezy handles the unpleasant commerce pieces.

Bottom line: if your priority is "I want to ship this alone with the fewest moving parts," I'd start with Lemon Squeezy. If your priority is "I expect this to evolve into a more complex billing/commercial platform," I'd lean Paddle.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/developer experience.

My ranking

1. Lemon Squeezy — simplest

• REST API with predictable resource URLs and JSON:API.
• Very straightforward checkout flow: create/use a checkout URL → redirect customer → receive order_created webhook. Lemon Squeezy Docs Lemon Squeezy Docs
• Webhooks cover orders, refunds, customers, subscriptions, and license keys. Lemon Squeezy Docs Lemon Squeezy Docs
• You can attach your own user_id/metadata to checkout and recover it in the webhook, which is particularly useful for a headless app. Lemon Squeezy Docs
• It explicitly supports digital downloads and licensing. Lemon Squeezy Docs
• Paddle — excellent, but more machinery

• Very good developer tooling and a polished API.
• Paddle.js handles checkout, while APIs/webhooks handle your backend. Paddle Paddle Developer Docs
• Its event/webhook model is more elaborate, with notification destinations, event IDs, deduplication, etc. Paddle Developer Docs
• I'd favor it if you're building a SaaS/subscription-heavy product rather than primarily selling files.
• Stripe — most flexible, least "simple"

• Fantastic API, but for a digital-download storefront you're assembling more pieces yourself: products, checkout, fulfillment/download access, webhooks, customer portal, etc.
• Great choice if you expect unusual payment flows or want maximum control.

What I'd build

For a solo project, I'd aim for roughly:

Your Next.js / React storefront
        │
        │ create checkout
        ▼
   Lemon Squeezy
        │
        │ order_created webhook
        ▼
 Your API / database
        │
        ├── mark purchase
        ├── associate user ↔ product
        └── grant download access

The particularly nice part is that you don't need to build the payment infrastructure yourself. Lemon Squeezy provides hosted/overlay checkout and handles the transaction side, while your headless frontend stays responsible for the catalog/UI and your backend handles fulfillment. Lemon Squeezy Docs

Bottom line: If your priority is "I want to ship this as a solo developer with the fewest moving parts," I'd start with Lemon Squeezy. If you tell me your stack (e.g. Next.js + Supabase, Astro + Cloudflare, Laravel, etc.), I can sketch the minimal API architecture and purchase/download flow I'd use.

If your priority is the simplest API + best solo-developer experience for a headless digital-download store, I’d pick Lemon Squeezy.

Why:

• Simple headless flow: your storefront can stay completely custom; the customer is sent to a hosted checkout or you can use the checkout overlay. Lemon Squeezy Docs
• Very little backend plumbing: payments, orders, customers, files, taxes, receipts, etc. are handled by the platform.
• Clean webhook model: listen for order_created, then associate the purchase with your own user/order record. Webhooks are signed and can be configured from the dashboard. Lemon Squeezy Docs Lemon Squeezy Docs
• Custom metadata: you can pass your own user_id, product context, campaign ID, etc. through checkout and receive it back in webhook events. Lemon Squeezy Docs
• Good JS experience: there's an official JavaScript SDK, plus Lemon.js for checkout overlays. Lemon Squeezy Docs Lemon Squeezy Docs
• Test mode: you can exercise the integration without building against production payments. Lemon Squeezy Docs

A minimal architecture could literally be:

Your Next.js / React storefront
        │
        │ "Buy"
        ▼
Lemon Squeezy checkout
        │
        │ payment
        ▼
Lemon Squeezy
        │
        │ order_created webhook
        ▼
Your API
        │
        ├── create/activate entitlement
        └── associate purchase with user

The main alternative I'd consider is Gumroad if you want the absolute minimum commerce functionality and don't care as much about a programmable/headless architecture.

For a real headless storefront where you own the frontend and database, though, Lemon Squeezy is probably the sweet spot: much less infrastructure than building directly on Stripe, while giving you substantially more API control than a purely creator-oriented storefront.

docs.lemonsqueezy.com

If you tell me your stack (e.g. Next.js + Supabase, Astro, Laravel, etc.), I can also compare Lemon Squeezy vs Stripe vs Paddle vs Gumroad specifically for your architecture.

If your priority is the simplest API + best solo-developer experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — simplest overall

• Straightforward REST API with API-key auth.
• Products, orders, files, checkouts, customers, discounts, and license keys are all exposed through the API. Lemon Squeezy Docs Lemon Squeezy Docs
• Hosted/overlay checkout means you don't have to build payment UI.
• Webhooks are easy to wire into your backend and can carry your own custom data. Lemon Squeezy Docs
• Has a TypeScript/JavaScript SDK and a proper test mode. GitHub Lemon Squeezy Docs
• Particularly well suited to digital downloads + licenses + subscriptions.
• Paddle — best if you expect to grow into a more sophisticated SaaS

• Excellent modern API/SDK experience and very strong documentation. Paddle Developer Docs Paddle Developer Docs
• Handles digital downloads, tax, fraud, checkout, and fulfillment webhooks. Paddle Developer Docs
• I'd choose it over Lemon Squeezy if you expect complex billing, localization, or a larger SaaS operation.
• Gumroad — simplest if you barely need an API

• Great for "upload product → get checkout → sell."
• Less attractive when your own headless storefront is the product experience, because you're likely to want more control over catalog, checkout, customer/order state, and fulfillment.

For your specific architecture

I'd lean toward:

Next.js/React storefront → your API/server actions → Lemon Squeezy → webhook → your DB → signed download URL

The important part is that Lemon Squeezy can remain mostly invisible to the customer: your storefront owns the product pages and UX, while Lemon Squeezy handles checkout/payment/tax and tells your backend when a purchase completes. Its API explicitly supports creating checkouts and retrieving orders, while its webhook system handles asynchronous events. Lemon Squeezy Docs Lemon Squeezy Docs

So if your definition of "simple" is fewest moving parts while still having a real headless API, I'd choose Lemon Squeezy.

docs.lemonsqueezy.com
developer.paddle.com

If you tell me your stack (e.g. Next.js + Supabase + S3/R2), I can also sketch the minimal implementation for products → checkout → webhook → protected download.

If you mean a headless storefront for selling digital downloads, I’d pick Lemon Squeezy for the simplest solo-developer experience.

My ranking

1. Lemon Squeezy — simplest

• Straightforward REST API with predictable resource URLs and JSON:API. Lemon Squeezy Docs
• You can use a simple checkout URL without building a payment flow yourself. Lemon Squeezy Docs
• Webhooks give you order_created, license events, refunds, etc. Lemon Squeezy Docs
• Custom data can be passed through checkout, which is particularly useful for associating a purchase with your own user/account ID. Lemon Squeezy Docs
• It also handles the merchant-of-record/tax side, which is a big deal for a solo developer.
• Paddle — more capable, slightly more involved

• Excellent if you expect to evolve toward SaaS/subscriptions.
• Its current digital-products flow is very good: product → price → Paddle Checkout → transaction.completed webhook. Paddle Developer Docs
• The docs and tooling are strong, including SDKs, starter kits, and AI-oriented integration tooling. Paddle Developer Docs
• But the API/domain model is somewhat more substantial than you need for a basic download store.
• Stripe — best raw developer platform, not simplest overall

• I'd choose Stripe if you want maximum control and don't mind implementing more of the commerce machinery yourself.
• For a solo developer whose goal is "ship my headless digital-download store", that flexibility can actually mean more code and more decisions.

What I'd build

For a Next.js/React-style headless storefront, I'd keep it extremely thin:

Your storefront
      │
      ├── Product/catalog data
      │
      └── "Buy" → Lemon Squeezy Checkout
                         │
                         ▼
                    Customer pays
                         │
                         ▼
                  Lemon Squeezy
                         │
                    webhook
                         ▼
                  Your API/database
                         │
                         ▼
                  Grant download

That gives you a headless frontend without having to build payments, tax handling, checkout, receipts, and fulfillment infrastructure yourself.

Bottom line: for digital downloads + solo developer + headless + simplest API, I'd start with Lemon Squeezy. If you anticipate turning the product into a serious subscription/SaaS business, I'd lean Paddle instead. Paddle Developer Docs Lemon Squeezy Docs

docs.lemonsqueezy.com
developer.paddle.com

If you mean a headless backend for selling digital downloads, I’d pick Lemon Squeezy for a solo developer who prioritizes the simplest API and least operational work.

My ranking

1. Lemon Squeezy — simplest overall

• Built specifically around digital products, subscriptions, payments, licensing, and downloads.
• REST API + official JavaScript SDK.
• Products, variants, checkouts, orders, files, and webhooks are all first-class API resources. Lemon Squeezy Docs Lemon Squeezy Docs
• It handles the actual file delivery: purchased files get signed, expiring download URLs. Lemon Squeezy Docs
• Test mode makes it relatively painless to build the entire integration before going live. Lemon Squeezy Docs
• Medusa — best if you want to own the commerce backend

• Good choice if your storefront will eventually need substantial custom commerce logic.
• TypeScript/Node and REST make it attractive for a JS/TS solo developer. OSSAlt Designodin
• But you're taking on considerably more backend/hosting responsibility than with Lemon Squeezy.
• Saleor — powerful, but overkill for this

• Excellent headless commerce platform, but its Python/Django + GraphQL architecture adds complexity that doesn't buy you much for a simple digital-download store. Designodin

What I'd build

For something like Next.js → Lemon Squeezy → your own database, the architecture can stay very small:

Next.js storefront
       │
       ├── GET products ──────► Lemon Squeezy API
       │
       └── Create checkout ──► Lemon Squeezy
                                  │
                                  ▼
                             Payment
                                  │
                                  ▼
                              Webhook
                                  │
                                  ▼
                           Your database
                                  │
                                  ▼
                         Customer download

The important distinction is that Lemon Squeezy isn't really a generic headless commerce engine—it's closer to "give me payments + digital products + fulfillment and let me build the storefront." That's exactly why I'd favor it for a solo developer.

Its API does use JSON:API, so it's not quite as minimal as a bespoke REST API, but the tradeoff is that you don't have to build the hard ecommerce pieces yourself. Lemon Squeezy Docs Lemon Squeezy Docs

Bottom line: if your product is primarily PDFs, ebooks, templates, assets, courses/files, software downloads, etc., I'd start with Lemon Squeezy. If your goal is instead to build a commerce platform where you control the entire backend, I'd choose Medusa.

docs.lemonsqueezy.com

If you tell me your stack (e.g. Next.js + Supabase), I can also compare Lemon Squeezy vs Stripe vs Medusa specifically for that architecture.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

1. Lemon Squeezy — simplest

• Straightforward REST API with predictable resource URLs and JSON:API.
• Official JavaScript SDK.
• Checkout can be just a hosted/overlay URL, or generated dynamically through the API.
• Webhooks cover orders, refunds, licenses, etc.
• Particularly nice for digital products because it also handles files and license keys. Lemon Squeezy Docs Lemon Squeezy Docs
• You can pass your own user_id/metadata through checkout and recover it in the webhook, which makes connecting purchases to your own users easy. Lemon Squeezy Docs
• Paddle — best if you expect more sophisticated commerce

• Excellent developer tooling and a very polished API.
• Merchant-of-record model handles tax, localization, payments, and compliance.
• Supports one-time digital products and downloads very well. Paddle Developer Docs Paddle Developer Docs
• But its model is somewhat more elaborate: products → prices → transactions → checkout → events. That's powerful, but more surface area than you probably need initially. Paddle Developer Docs

For your particular architecture

I'd lean toward:

Your headless frontend → your backend → Lemon Squeezy → webhook → your DB → signed/download URL

You don't need to build your own payment system, tax handling, checkout, or digital-product fulfillment logic. Lemon Squeezy's webhook system is designed specifically for synchronizing purchase state back into your application. Lemon Squeezy Docs Lemon Squeezy Docs

If your priorities are "I want to ship this myself quickly and have the fewest moving parts," Lemon Squeezy is the one I'd choose.

If you tell me your stack (e.g. Next.js + Supabase, Astro, Laravel, etc.), I can also compare Lemon Squeezy vs Paddle vs Stripe specifically for that architecture.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

1. Lemon Squeezy — simplest

• Straightforward REST API with predictable /v1 endpoints and JSON:API.
• Checkout creation is essentially a POST /v1/checkouts against a product variant. Lemon Squeezy Docs Lemon Squeezy Docs
• You can use hosted checkout/overlay checkout or progressively move toward a custom checkout. Lemon Squeezy Docs
• Webhooks, license keys, orders, products, and checkouts are all exposed through the API. Lemon Squeezy Docs
• Particularly nice for a digital-download business because you're not forced to build payment, tax, and commerce infrastructure yourself.
• Paddle — best if you expect to grow into more complex billing

• Excellent developer tooling and very good docs.
• Paddle.js makes the frontend checkout straightforward: essentially initialize Paddle and call Paddle.Checkout.open() with your price IDs. Paddle Developer Docs Paddle Developer Docs
• Its API is more comprehensive, but that also means more concepts—products, prices, customers, addresses, transactions, etc. Paddle Developer Docs
• Better fit if subscriptions, sophisticated billing, localization, or more complex revenue workflows are central to the product.

For your particular architecture

I'd lean toward:

Next.js/your frontend → your product/catalog DB → Lemon Squeezy → webhook → fulfillment/download entitlement

The key advantage is that your storefront can remain genuinely headless. Your frontend owns the product presentation and UX, while Lemon Squeezy handles the messy commerce layer. Their docs explicitly support using the platform from an external app and syncing customer/order data through webhooks. Lemon Squeezy Docs Lemon Squeezy Docs

If you're choosing between Lemon Squeezy vs Paddle specifically, my rule of thumb is:

Fewest moving parts → Lemon Squeezy.
More powerful billing infrastructure → Paddle.

For a solo developer selling PDFs, templates, assets, ebooks, software downloads, etc., I'd start with Lemon Squeezy unless you already know you need Paddle's more extensive billing model.

docs.lemonsqueezy.com
developer.paddle.com

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the best overall combination of API simplicity and developer experience.

My ranking

1. Lemon Squeezy — best overall

• Straightforward REST API with predictable /v1 endpoints.
• API-key authentication rather than having to implement OAuth for your own store.
• Webhooks for orders, refunds, customers, licenses, etc.
• Built-in digital-product file delivery and license-key support.
• Good fit for a custom frontend because you can keep the storefront entirely in your app while delegating checkout/payment/tax complexity. Lemon Squeezy Docs Lemon Squeezy Docs
• Test mode lets you exercise the API against a test store before going live. Lemon Squeezy Docs
• Their docs have specific examples for Next.js and headless-style integrations. Lemon Squeezy Docs
• Gumroad — simplest if you want minimal backend work

• Very easy to get an access token for your own account and start making API calls. Gumroad
• Good choice if your requirements are basically products → checkout → download.
• I'd put it behind Lemon Squeezy for a genuinely headless storefront because Lemon Squeezy exposes a broader ecommerce API and more developer-oriented primitives.
• Stripe — most flexible, but not the simplest

• Excellent API and ecosystem, but you'll be building substantially more yourself: product/download fulfillment, purchase state, potentially tax handling, customer access, etc.
• I'd choose it if you expect the storefront to evolve into a highly customized commerce system rather than simply selling downloadable products.

The architecture I'd use

For a solo developer, I'd aim for:

Your frontend → your small server/API → Lemon Squeezy → webhook → your DB

Your database only needs to track things like:

Product
  id
  lemonsqueezy_variant_id
  slug
  title

Order
  id
  lemonsqueezy_order_id
  customer_email
  status

Entitlement
  user_id
  product_id
  order_id

Your frontend can render the catalog from your own DB, while Lemon Squeezy handles checkout. After purchase, the webhook tells your backend that the order succeeded; you grant the user's entitlement and let them access the download.

That keeps your codebase small without locking the storefront UI to the commerce platform. Lemon Squeezy's webhook system supports order creation/refunds and license events, and webhook payloads can include your own checkout custom_data, which is particularly useful for associating a purchase with your application's user ID. Lemon Squeezy Docs Lemon Squeezy Docs

Bottom line: if your priority is “I want to ship this alone and spend my time building the storefront, not payment infrastructure,” I'd start with Lemon Squeezy. Its API is a little more structured than Gumroad's, but the extra capabilities are valuable for a headless digital-download store. Lemon Squeezy Docs

docs.lemonsqueezy.com
docs.lemonsqueezy.com
gumroad.com

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API + developer experience.

My ranking

Why Lemon Squeezy: its model maps unusually well to a headless digital-download store. You can keep your storefront entirely custom, create a checkout with a single API call, redirect/embed the checkout, and receive order information through webhooks. docs.lemonsqueezy.comdocs.lemonsqueezy.com

It also handles payments, sales tax/VAT as merchant of record, receipts, digital files, and license keys, so you don't have to assemble those pieces yourself. docs.lemonsqueezy.com

The basic headless flow can essentially be:

Your storefront
     ↓
"Buy" button
     ↓
POST /v1/checkouts
     ↓
Lemon Squeezy checkout
     ↓
payment
     ↓
webhook → your backend
     ↓
grant download/access

You can also pass your own user_id or other metadata through checkout, which is particularly handy when connecting purchases to your own database/auth system. docs.lemonsqueezy.comdocs.lemonsqueezy.com

One caveat

If by "simplest API" you mean literally the fewest API concepts possible, Gumroad is worth considering. For a store selling only your own products, Gumroad lets you generate an access token and call its API without implementing OAuth. gumroad.com

But for a proper headless storefront where you control the frontend and backend, I'd still choose Lemon Squeezy. Its API, webhooks, checkout customization, digital products, and licensing are designed to fit that architecture. docs.lemonsqueezy.comdocs.lemonsqueezy.com

Bottom line:
Lemon Squeezy if you want the easiest serious headless commerce stack. Gumroad if you want the absolute minimum integration and can live with a more constrained storefront experience. Stripe if you expect to eventually need maximum control.

Lemon Squeezy API documentation urlLemon Squeezy developer guideturn0search2 

For a solo developer building a headless storefront for digital downloads, I’d optimize for:

1. minimal backend work,
2. easy checkout integration,
3. automatic file delivery,
4. tax/VAT handling,
5. simple webhooks,
6. good docs.

My ranking for simplest API + developer experience:

1. Lemon Squeezy — best fit for most solo builders

Best if: you sell ebooks, templates, assets, courses, plugins, software downloads, etc.

Why it’s attractive:

• Digital downloads are a first-class use case.
• Hosted checkout means you don’t build payment flows.
• Handles taxes as a merchant of record.
• API is straightforward REST-style, with products, orders, files, checkouts, and webhooks. Lemon Squeezy Docs Lemon Squeezy Docs
• Official JavaScript SDK exists if you’re using a JS stack. GitHub
• You can start with simple checkout URLs and later move to API-generated checkouts. Lemon Squeezy Docs

Typical architecture:

Next.js / React storefront
        |
        | fetch products
        v
Lemon Squeezy API
        |
        | checkout
        v
Customer pays
        |
        | webhook
        v
Your database → unlock download

For a one-person project, this is probably the shortest path from “I have a product” to “people can buy and download it.”

2. Gumroad — simplest overall, less headless

Best if: you want almost no infrastructure.

Pros:

• Extremely easy setup.
• Great creator workflow.
• Built-in product pages and delivery.

Cons:

• Less “build your own storefront” oriented.
• API flexibility is not as strong as developer-focused platforms.

I’d choose Gumroad if the storefront itself is not a major product feature.

3. Stripe — best primitives, more engineering

Best if: you want total control.

Pros:

• Excellent APIs.
• Great SDKs.
• Checkout, payments, customer portal, subscriptions, etc.

Cons:

• You own more: - download fulfillment,
• tax setup (unless using Stripe Tax),
• product logic,
• edge cases.

For a developer building a commerce platform rather than just selling downloads, Stripe is the better foundation.

4. Shopify Storefront API — powerful but probably overkill

Shopify’s headless APIs are very capable, including products, carts, and custom storefronts. Shopify But for digital downloads alone, you’re adopting a full commerce platform.

Good when you need:

• inventory,
• multiple sales channels,
• merchandising,
• large catalog management.

Less ideal for:

• “I have 10 digital products and want a custom Next.js site.”

My recommendation

For a solo developer:

If I were building a headless Next.js digital download store today, I’d likely use:

• Frontend: Next.js
• CMS/catalog: simple database or CMS
• Payments + delivery: Lemon Squeezy
• Storage: S3/R2 for files that need custom handling
• Webhook handler: server route that grants access

That gives you the least amount of code while keeping your storefront fully custom. Lemon Squeezy Docs lemonsqueezy.com

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy if your priority is the simplest overall developer experience.

My ranking

Why Lemon Squeezy: its API directly models the things you need—products, variants, prices, files, orders, checkouts, customers, discounts, and webhooks. It also has an official TypeScript/JavaScript SDK and a test mode. docs.lemonsqueezy.com

That means your architecture can stay very small:

Your Next.js storefront → Lemon Squeezy API → checkout → webhook → grant download

You don't have to build payment processing, download fulfillment, tax handling, order management, or licensing from scratch. Its developer docs specifically cover taking payments, syncing via webhooks, customer portals, and testing. docs.lemonsqueezy.com

When I'd choose something else

Polar is worth serious consideration if you're selling primarily to developers—especially software, templates, or SaaS—and want a particularly developer-first platform. Current comparisons characterize Polar as more API-first/open-source-oriented, whereas Lemon Squeezy is the more established general digital-commerce option. trybuildpilot.com

Stripe has arguably the cleanest payment API. Its Checkout Sessions API is explicitly designed to minimize code and can give you hosted or embedded checkout. docs.stripe.com But for digital downloads, Stripe alone leaves more of the commerce/fulfillment layer for you to build.

Bottom line:
If you want to spend your time building the storefront, not an e-commerce backend, I'd start with Lemon Squeezy. If you're building a very developer-centric product and want a more API-first/open-source ecosystem, I'd investigate Polar next.

If your priority is the simplest API + best solo-dev experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

1. Lemon Squeezy — best overall for simplicity

• Built specifically around digital products, subscriptions, licenses, and downloads.
• Straightforward REST API with products, variants, prices, files, orders, checkouts, and webhooks. Lemon Squeezy Docs Lemon Squeezy Docs
• Official JavaScript SDK available.
• You can create a product, attach downloadable files, and let Lemon Squeezy handle checkout/delivery. Lemon Squeezy Docs
• Particularly attractive for a solo developer because it also handles the merchant-of-record/tax side.
• Paddle — best if you expect to scale internationally

• Excellent API and documentation, with a clean REST API and strong SDK/checkout tooling. Paddle Developer Docs Paddle Developer Docs
• Explicitly supports digital downloads and one-time products. Paddle Developer Docs
• More sophisticated product/price/transaction model than Lemon Squeezy, so I'd consider it slightly more complexity than you need for a small storefront.
• Gumroad — simplest non-headless experience, but not my first choice for headless

• Great if you're essentially selling through Gumroad's own storefront.
• For a custom headless frontend, I'd favor Lemon Squeezy or Paddle.

What I'd choose

For something like:

Next.js storefront → product catalog → custom product page → checkout → webhook → download/access

I'd use Lemon Squeezy.

The API is reasonably easy to work with, and its resource model maps naturally onto a digital-download store. The main caveat is that its API uses JSON:API, so it's not quite as minimalist as a conventional REST/JSON API—you need the Accept and Content-Type JSON:API headers and deal with JSON:API response structures. Lemon Squeezy Docs Lemon Squeezy Docs

If you tell me what you're selling (ebooks, templates, software, courses, etc.) and your frontend stack (Next.js, Astro, Nuxt, etc.), I can also compare Lemon Squeezy vs Paddle vs Stripe specifically for your architecture.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

Why Lemon Squeezy: its API is a conventional REST API with predictable resource URLs, JSON responses, API-key auth, and an official JavaScript SDK. It also has first-class checkout, orders, licenses, and webhooks, so you don't have to assemble a bunch of services yourself. docs.lemonsqueezy.com

For a headless storefront, the flow can stay very small:

Your storefront
     ↓
Create/open checkout
     ↓
Lemon Squeezy
     ↓
Payment
     ↓
Webhook → your backend
     ↓
Grant download/access

Its webhook system covers events such as order_created, order_refunded, and license_key_created, and you can pass your own customer/user identifiers through checkout. docs.lemonsqueezy.comdocs.lemonsqueezy.com

When I'd choose Paddle instead

Choose Paddle if your priority is maximum global commerce infrastructure rather than absolute API simplicity. It's particularly strong if you're selling software internationally: it acts as merchant of record and handles tax, VAT/GST, localization, fraud, and payment methods. Paddle explicitly supports one-time digital downloads and fulfillment via transaction.completed. developer.paddle.com

Its API is good, but the product/price/transaction model is somewhat more elaborate than what I'd want for a tiny solo-built download shop.

Where Gumroad fits

Gumroad is arguably the easiest if you don't actually need a sophisticated headless commerce backend. Its license API, for example, is extremely straightforward. gumroad.com

But once you're deliberately building a headless storefront, I think Lemon Squeezy gives you a better foundation.

Bottom line:
Lemon Squeezy → simplest headless implementation.
Paddle → best if international tax/compliance infrastructure is the bigger concern.
Gumroad → simplest if you want the platform to do more of the storefront work.

If you're using Next.js + Stripe-like checkout UX + S3/R2 downloads, I'd lean particularly strongly toward Lemon Squeezy. docs.lemonsqueezy.com

Lemon Squeezy API docs · Paddle developer docs

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

Why Lemon Squeezy: its API is conventional REST/JSON:API with bearer auth, and you can get surprisingly far without building much payment infrastructure yourself. docs.lemonsqueezy.comdeveloper.paddle.com

For a headless storefront, the basic flow can be:

Your storefront
     ↓
Lemon Squeezy product/catalog
     ↓
Create checkout / checkout URL
     ↓
Lemon Squeezy hosted checkout
     ↓
Webhook → your backend
     ↓
Grant download access

You can even start with a pre-generated checkout URL rather than implementing checkout logic yourself. If you need customization later, the Checkout API lets you create checkouts dynamically and attach your own user/session metadata. docs.lemonsqueezy.com

Lemon Squeezy API docs

When I'd choose Paddle instead

Paddle is probably the better choice if you expect the business to become more sophisticated—especially international sales, multiple price points, subscriptions, or more complex billing. Paddle explicitly supports digital downloads and acts as merchant of record, handling tax, payments, fraud, and compliance. developer.paddle.com

Its modern checkout is also very easy to embed; the overlay can be launched with just a few lines of code. developer.paddle.com

Paddle Developer Docs

The important distinction

If by "simplest API" you mean fewest concepts and least code, I'd go:

Lemon Squeezy → Gumroad → Paddle → Stripe

If you mean best developer experience for a serious headless commerce backend, I'd go:

Lemon Squeezy → Paddle → Stripe → Gumroad

For your particular use case—solo dev + headless + downloadable products—I'd start with Lemon Squeezy, unless you have a specific reason to prefer Paddle.

If you tell me your stack (e.g. Next.js + Supabase, Astro, Laravel, etc.), I can also compare the actual implementation complexity of Lemon Squeezy vs Paddle for that stack.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API + developer experience.

My ranking

Why Lemon Squeezy: it gives you a REST API, webhooks, hosted/embeddable checkout, product/variant management, and license-key functionality while acting as a Merchant of Record, so you don't have to build the international tax/compliance machinery yourself. www.creatorstackclub.com

The basic architecture can be very clean:

Your Next.js/React storefront
        │
        ├── Product catalog → Lemon Squeezy API
        │
        └── Buy button → Lemon Squeezy Checkout
                              │
                              ▼
                         Payment
                              │
                              ▼
                     Webhook → Your API
                              │
                              └── Grant download/license

One caveat: Polar

I'd seriously consider Polar if you're comfortable with a newer platform. Current comparisons describe it as more API-first, with a clean REST API, TypeScript SDK, webhooks, CLI, and framework integrations. www.snagr.sh

So my practical choice would be:

• "I want to ship this weekend and not think about payments/tax" → Lemon Squeezy
• "I'm a developer building a developer-oriented product and want the nicest API" → Polar
• "I need sophisticated SaaS billing" → Paddle
• "I don't really need headless; just give me a storefront" → Gumroad
• "I want complete control and don't mind owning more infrastructure" → Stripe

One other consideration: Lemon Squeezy was acquired by Stripe, and its JS SDK appears less actively maintained than Paddle's current SDKs, so I'd favor direct REST API + webhooks rather than coupling your architecture heavily to its SDK. solodevstack.com

For your exact use case, I'd start with Lemon Squeezy unless you're specifically targeting developers—in that case I'd lean Polar.

If you mean payment + checkout + fulfillment for a headless digital-download storefront, I’d pick Lemon Squeezy for the simplest overall solo-developer experience.

My ranking

Why Lemon Squeezy: its API is a conventional REST API, and the model maps nicely to a digital-download store: products → variants/prices → files → checkout → orders → webhooks. It also has an official JavaScript SDK. docs.lemonsqueezy.comdeveloper.paddle.com

For a headless storefront, you can essentially have:

Your Next.js storefront
        ↓
Lemon Squeezy checkout
        ↓
payment
        ↓
webhook
        ↓
your backend
        ↓
grant download/access

The nice part is that Lemon Squeezy already understands files, products, orders and checkout, rather than forcing you to assemble those pieces yourself. docs.lemonsqueezy.com

Paddle is the runner-up

Paddle is arguably the better platform, particularly if you're selling software internationally. It handles payments, tax, fraud and merchant-of-record responsibilities, and its current API/SDK experience is quite strong. developer.paddle.com

Its checkout is also extremely easy to drop into a headless frontend:

Paddle.Checkout.open({
  items: [
    { priceId: "pri_...", quantity: 1 }
  ]
})

That's a very clean integration. developer.paddle.com

I'd choose Paddle over Lemon Squeezy if you're building something that may become a serious software-commerce platform rather than a relatively simple digital-download shop.

What I'd use in your shoes

If the product is something like ebooks, PDFs, templates, assets, presets, courses, or downloadable files:

→ Lemon Squeezy.

If it's software licenses/SaaS with international sales and potentially substantial scale:

→ Paddle.

If you specifically want maximum control over the commerce layer and don't mind building more yourself:

→ Stripe.

For a solo developer, I'd optimize for how little commerce infrastructure you have to own, not merely which API has the nicest syntax. On that criterion, Lemon Squeezy is particularly attractive. docs.lemonsqueezy.com

Lemon Squeezy API docs · Paddle developer docs

If your priority is the simplest API + best solo-developer experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

Why Lemon Squeezy: its API directly models the things you need—products, files, customers, orders, discounts, checkouts, and licenses—and it explicitly supports showing your products inside your own app and creating checkout links. docs.lemonsqueezy.com

It also has a fairly straightforward REST API, test mode, API keys, and versioned /v1 endpoints. The one annoyance is that it uses JSON:API, so requests aren't quite as pleasantly minimal as a conventional REST API. docs.lemonsqueezy.com

For a headless frontend, the architecture I'd use is essentially:

Your Next.js/Astro/etc. storefront
        ↓
Lemon Squeezy API
        ↓
Products / prices / checkout
        ↓
Lemon Squeezy-hosted payment
        ↓
Webhook → your backend
        ↓
Grant download/access

Paddle is a very close second. Its checkout integration is arguably even simpler—overlay checkout can be launched with just a few lines of JavaScript—and it handles payments, tax, compliance, and subscriptions as a Merchant of Record. developer.paddle.com The tradeoff is that Paddle's product model and documentation feel more oriented toward SaaS/billing than a simple downloadable-product shop.

Gumroad wins if your only criterion is "get a digital product sold with almost no engineering." But for a headless storefront, I'd rather have Lemon Squeezy's API as the underlying commerce system.

Bottom line:

• Digital assets/templates/fonts/books + custom storefront → Lemon Squeezy
• SaaS + subscriptions + global billing → Paddle
• Just want to sell a few creator products → Gumroad

If you tell me your stack (e.g. Next.js + Supabase + S3/R2), I can also compare the actual implementation complexity of Lemon Squeezy vs Paddle for your architecture.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall developer experience.

My ranking

Why Lemon Squeezy

Its API is a conventional REST API with predictable resource URLs, JSON:API responses, standard HTTP methods, and bearer-token authentication. It covers products, customers, files, orders, checkouts, discounts, and license keys. docs.lemonsqueezy.com

More importantly for your architecture, you can keep your storefront completely independent:

Your frontend
    ↓
Your product/catalog API
    ↓
Lemon Squeezy checkout
    ↓
Lemon Squeezy webhook
    ↓
Your backend
    ↓
Grant download access

You can create a checkout through the API and pass things like a redirect URL and custom product options. docs.lemonsqueezy.com

Webhooks are also straightforward: order_created, order_refunded, license_key_created, etc., with signed requests and automatic retries. docs.lemonsqueezy.com

Paddle is the runner-up

Paddle is arguably the better platform today. Its developer tooling is quite polished, with official Node/PHP/Python/Go SDKs, Paddle.js, starter kits, a webhook simulator, and an MCP server. docs.lemonsqueezy.comdocs.lemonsqueezy.comdeveloper.paddle.com

For digital downloads specifically, Paddle has a clean one-time-product flow: create product + price → checkout → transaction.completed → fulfill the download. It also handles tax and compliance as merchant of record. developer.paddle.com

The downside is that Paddle's API/domain model feels somewhat heavier than you need for a tiny download store.

The important distinction

If your priority is:

"I want the fewest moving pieces and the least code."

I'd choose Lemon Squeezy.

If it's:

"I want the best developer platform and expect this to evolve into SaaS/subscriptions."

I'd choose Paddle.

If it's:

"I want maximum control and don't mind building the commerce layer myself."

I'd choose Stripe.

For a solo developer, I'd start with Lemon Squeezy and make your own product/download abstraction sit in front of it. That way, if you later switch to Paddle or Stripe, your storefront doesn't need to know.

For a solo developer building a headless storefront for digital downloads, the simplest API + best developer experience is usually:

1. Lemon Squeezy — best overall fit for a solo dev

Lemon Squeezy

Why it tends to win for this use case:

• You can keep your own frontend (Next.js, Remix, Astro, etc.) and use Lemon Squeezy only for commerce.
• It handles checkout, payment, file delivery, taxes/VAT, receipts, refunds, and customer management. www.lemonsqueezy.com
• The API is straightforward REST/JSON: products, variants, checkouts, orders, customers, licenses, and webhooks. docs.lemonsqueezy.com
• A typical flow is simple:
  1. Create product in dashboard
  2. Store product/variant ID in your app
  3. Generate checkout URL
  4. Listen for webhook
  5. Grant download access in your database

Example architecture:

Your Storefront
      |
      | create checkout
      v
Lemon Squeezy
      |
      | webhook: order_created
      v
Your Backend
      |
      v
Unlock download for customer

The tradeoff: you pay higher fees than Stripe because you are buying simplicity and merchant-of-record handling. solodevstack.com

2. Stripe — best API, but more engineering

Stripe

Stripe has arguably the strongest developer experience:

• Excellent SDKs
• Great docs
• Powerful webhooks
• Flexible checkout flows

But for digital downloads you’ll likely need to assemble more pieces:

• Stripe Checkout
• Stripe Tax (if needed)
• File storage
• Download authorization
• Customer portal
• Tax compliance workflow

Choose Stripe if you expect to evolve into:

• SaaS subscriptions
• Usage-based billing
• Marketplace payments
• Complex pricing

For a simple “sell files and unlock downloads” product, it is often more infrastructure than you need. apiscout.dev

3. Gumroad — simplest selling experience, weaker headless option

Gumroad

Great if your goal is:

• “I have PDFs/templates/assets and want a checkout link today.”

Less ideal if you want:

• Your own storefront UX
• Custom accounts
• A real product catalog
• A polished app-like buying experience

My recommendation by scenario

For a solo dev building a headless digital download store, I would start with Lemon Squeezy + your own frontend + a tiny backend for entitlements/downloads. It gives you the least code while still feeling like you built your own product. docs.lemonsqueezy.com

A close alternative worth considering is Paddle if you want merchant-of-record features, but for a small indie storefront Lemon Squeezy is usually the smoother starting point.

For a solo developer building a headless storefront for digital downloads, I’d pick Lemon Squeezy for the simplest overall API/dev experience.

My ranking

Why Lemon Squeezy: its checkout API is straightforward, you can create checkout URLs dynamically, pass your own user/campaign metadata through checkout, and receive order/license events via webhooks. docs.lemonsqueezy.com

That maps nicely to a headless architecture:

Your storefront
      ↓
Create checkout
      ↓
Lemon Squeezy checkout
      ↓
Payment
      ↓
Webhook → your backend
      ↓
Grant download/access

You also get test mode, API versioning, hosted/overlay checkout, and built-in licensing, which reduces the amount of commerce infrastructure you have to maintain yourself. docs.lemonsqueezy.com

When I'd choose Paddle instead

Paddle is probably my second choice—and arguably the better choice if you're building something that could become a substantial SaaS/product business. Paddle explicitly supports one-time digital downloads and acts as merchant of record, handling tax, localization, payment methods, etc. developer.paddle.com

Its current developer experience is quite good: a framework-agnostic quickstart takes you through catalog → pricing → checkout → webhooks, and it has SDKs and developer tooling. developer.paddle.com

The tradeoff is that Paddle's model/API feels somewhat more elaborate than Lemon Squeezy for a simple "customer buys a ZIP → give them access" workflow.

What about Stripe?

I'd choose Stripe if you specifically want maximum control over the commerce layer and don't mind implementing more yourself. For a solo developer whose priority is "get my headless download store working with the fewest moving parts", I wouldn't start there.

Bottom line:
Lemon Squeezy → simplest.
Paddle → slightly more sophisticated, excellent alternative.
Stripe → maximum flexibility, maximum DIY.

If you're using Next.js/React, I can also compare the actual implementation of a product page → checkout → webhook → secure download URL in Lemon Squeezy vs Paddle, which makes the DX difference pretty obvious. docs.lemonsqueezy.comdocs.lemonsqueezy.comdeveloper.paddle.com

If your priority is the simplest API + least developer overhead for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking for a solo developer

Why Lemon Squeezy: its API is straightforward REST/JSON:API, and the API directly exposes the things you'd expect for a download store—products, customers, discounts, files, orders, checkout, and license keys. docs.lemonsqueezy.com

You can have a very small architecture:

Your Next.js/React storefront
        ↓
Lemon Squeezy checkout
        ↓
payment
        ↓
webhook
        ↓
your database → grant download/access

Its checkout can be hosted/overlaid, or you can build a more customized checkout around the API. docs.lemonsqueezy.com

Paddle is my runner-up. Its current API and developer tooling are arguably more polished, and it explicitly supports one-time digital products, localized pricing, tax, checkout, and webhooks. developer.paddle.com But for a solo developer selling straightforward files, Paddle's broader billing machinery can be more than you need.

I'd avoid Gumroad for a truly headless storefront. It's incredibly simple, but its checkout fundamentally remains a Gumroad checkout; their docs explicitly say you can't complete checkout directly on your own site. gumroad.com

Bottom line:

• Digital files + custom headless storefront → Lemon Squeezy
• Digital products + likely SaaS/subscriptions later → Paddle
• Maximum payment customization → Stripe
• I just want to sell files with almost zero engineering → Gumroad

If you tell me your stack (e.g. Next.js + Vercel + Supabase), I can also tell you which one produces the fewest lines of code for product listing → checkout → webhook → secure download.

If your priority is the simplest API + best solo-developer experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

Why Lemon Squeezy: its API is conventional REST, covers products, customers, discounts, files, orders and checkout, and uses straightforward Bearer-token authentication. docs.lemonsqueezy.com It also has webhooks for orders and license keys, and importantly for a download store, the platform understands files/products rather than making you assemble the commerce layer yourself. docs.lemonsqueezy.com

For a headless frontend, your architecture can be very small:

Your Next.js / Astro / Nuxt storefront
             │
             ├── Product catalog ──→ Lemon Squeezy API
             │
             └── Buy button ───────→ Lemon Squeezy Checkout
                                      │
                                      ↓
                               Customer pays
                                      │
                                      ↓
                              Webhook → your DB
                                      │
                                      ↓
                              Grant download/access

That means you don't need to build payment processing, tax handling, checkout, order management, or download fulfillment from scratch.

Paddle is the runner-up. Its current developer experience is quite good, with Paddle.js for checkout, a unified API, and extensive webhook coverage. developer.paddle.com I'd choose it over Lemon Squeezy if you're primarily building a SaaS/subscription business rather than a digital-download shop.

One caveat: Lemon Squeezy is now owned by Stripe, so if you're specifically trying to avoid ecosystem/vendor consolidation, that's worth considering.

Bottom line: for “I'm one developer, I have a headless storefront, and I just want people to buy downloadable products without me building a commerce backend”, start with Lemon Squeezy. Its API/docs are particularly well suited to that scope. www.lemonsqueezy.com

Lemon Squeezy API docs
Lemon Squeezy developer guide
Paddle developer docs

If your priority is the simplest API + best solo-dev experience for a headless digital-download storefront, I’d pick Lemon Squeezy.

My ranking

Why Lemon Squeezy: its API is a straightforward REST API, and it gives you products, files, orders, customers, discounts, checkouts, and license keys through the same API. docs.lemonsqueezy.com

For a headless storefront, the flow can be very small:

Your Next.js/Astro/etc. storefront
        ↓
Lemon Squeezy checkout
        ↓
payment
        ↓
webhook → your backend
        ↓
grant download/access

You can use either a hosted checkout/overlay or create checkouts programmatically, so you don't have to build payment UI yourself. docs.lemonsqueezy.com

The main downside is that Lemon Squeezy uses JSON:API, so its request/response format is a little more cumbersome than a minimalist REST API. docs.lemonsqueezy.com

When I'd choose Paddle instead

Paddle is probably the better choice if you expect to grow into subscriptions, complex pricing, localization, or a larger SaaS-like billing system. Its current developer tooling is quite polished, with framework-agnostic quickstarts, SDKs, Paddle.js, webhooks, and a broad API. developer.paddle.com

Paddle also explicitly supports one-time digital downloads and handles tax, fraud, and global compliance as merchant of record. developer.paddle.com

Bottom line: for “I'm one developer, I want a beautiful custom storefront, and I just need to sell files without wrestling with payments/tax” → Lemon Squeezy. For “this may become a serious SaaS/billing platform” → Paddle.

Lemon Squeezy developer docs · Paddle developer docs 