# Best Ecommerce APIs for Developers in 2026
The best ecommerce APIs for developers in 2026: Shopify, Stripe, Medusa, Saleor, commercetools, BigCommerce, Swell, and Square, compared with real pricing
*Published 2026-09-28*
"Ecommerce API" means something different depending on who you ask: a payments team means Stripe, a headless-commerce team means Medusa or Saleor, and an enterprise architect means commercetools. None of them are wrong, and picking the wrong one for your actual problem is how a two-week integration turns into a two-quarter one. Here's how the real options compare on architecture, auth, rate limits, and pricing, checked against each vendor's own docs in September 2026.
**Bias disclosure:** We build [Your Next Store](https://yournextstore.com/), an AI-native commerce backend with its own REST API. We've included it below, named where we're behind, and won't shade the sections on the other eight. If you spot an error or an out-of-date price, [open an issue on GitHub](https://github.com/yournextstore/yournextstore/issues).
## What "Ecommerce API" Actually Means
Before the comparison, it's worth being precise, because the term covers three genuinely different things:
1. **A commerce backend API** – products, variants, carts, orders, inventory, customers. This is what you integrate against if you're building a custom storefront and don't want to write a catalog and order system from scratch. Medusa, Saleor, commercetools, Shopify's Admin API, and [Your Next Store](https://yournextstore.com) fall here.
2. **A payments API** – takes money, handles cards, subscriptions, refunds, and (sometimes) tax. It has no idea what a "product variant" is unless you build that layer yourself. Stripe and Square's payments endpoints are the clearest examples.
3. **A storefront/read API** – a public, often GraphQL, layer for reading catalog data and building a checkout flow, usually paired with a private admin API for writes. Shopify's Storefront API and BigCommerce's GraphQL Storefront API work this way.
A lot of "which ecommerce API is best" confusion comes from comparing a payments API to a commerce backend API as if they compete. They don't; they usually sit on top of each other. Keep that distinction in mind as you read the table below.
## Ecommerce APIs Compared (September 2026)
Prices are each vendor's own public list price where one exists; "custom quote" means the vendor doesn't publish one. Always check the vendor's current page before you commit: these change often.
| API | Architecture | Auth model | Starting price | Best for |
|-----|--------------|------------|-----------------|----------|
| [Shopify](https://www.shopify.com/) | GraphQL Admin API + GraphQL-only Storefront API (REST deprecated) | Access tokens, OAuth scopes | $29/mo (Basic, annual) | Merchants who want the largest app ecosystem behind the API |
| [Stripe](https://stripe.com/) | REST API (Payments, Billing, Tax, Connect) | Secret/publishable API keys | Pay-as-you-go, 2.9% + 30¢ per US card charge | Payments and billing, not a product catalog |
| [Medusa](https://medusajs.com/) | REST API, modular commerce engine, open source (MIT) | API keys (publishable/secret) + JWT sessions | Free self-hosted; [Medusa Cloud](https://medusajs.com/pricing) from $29/mo | TypeScript/Node teams who want to own the backend |
| [Saleor](https://saleor.io/) | GraphQL-only API, open source | API tokens / OAuth | Free Sandbox; [Saleor Cloud](https://saleor.io/pricing) from $1,599/mo | GraphQL-native teams building composable storefronts |
| [commercetools](https://commercetools.com/) | REST API + GraphQL API | OAuth 2.0 client credentials | Custom quote, no public pricing | Large enterprises with a dedicated platform team |
| [BigCommerce](https://www.bigcommerce.com/) | REST Management API + GraphQL Storefront API (read-only) | API tokens (`X-Auth-Token`) | $29/mo (Core, annual) | Teams who want SaaS reliability with real API access |
| [Swell](https://www.swell.is/) | Backend API (secret key) + Frontend API (public key) | Public/secret keys | $29/mo (Starter, annual) | Small teams who want a fast headless setup |
| [Square](https://squareup.com/) | REST API (Orders, Catalog, Inventory) + GraphQL Explorer (beta) | OAuth access tokens | Free software tier; 2.9% + 30¢ online processing | Sellers who need in-person and online on one API |
| [Your Next Store](https://yournextstore.com/) | REST API via the Commerce Kit SDK | `YNS_API_KEY` | $30/mo (Starter) | AI-native backend for solo devs and small teams |
## Shopify: The Biggest Ecosystem Behind the API
Shopify runs two APIs that matter to developers. The **Admin API** reads and writes everything behind the admin: products, orders, customers, inventory, fulfillment. The **Storefront API** is the buyer-facing layer for building a custom frontend. Both are GraphQL now; [Shopify marked the entire REST Admin API as deprecated in October 2024](https://community.shopify.com/c/technical-q-a/deprecating-rest-api/m-p/2678768), and new public apps and custom apps have been required to build on GraphQL since early 2025. If you're starting a fresh integration in 2026, there's effectively one API to learn, not two.
Auth is access tokens gated by OAuth scopes, and the rate limit is [cost-based rather than request-based](https://shopify.dev/docs/apps/build/apis/graphql-admin/rate-limits): every field and mutation has a point cost, standard plans get a 1,000-point bucket that refills at 50 points/second, and Shopify Plus doubles both numbers. That's a real design choice worth knowing before you write your first query: a deeply nested query can burn your whole budget in one call, and Shopify's own Bulk Operations API exists specifically to route big data pulls around this limit rather than through it.
Shopify's own plans run $29-$399/month depending on tier and billing cycle (see our [Shopify transaction fees breakdown](/blog/shopify-transaction-fees) for the full math including card processing), and the API itself is included at every tier, though some endpoints and higher rate-limit tiers are gated to Plus. The trade-off for that ecosystem: the API models Shopify's own commerce concepts, and if your business logic doesn't map cleanly onto Shopify's object model, you'll spend time working around it rather than with it.
## Stripe: Payments Infrastructure, Not a Catalog
Stripe is the API most developers reach for first, and for the specific job of moving money it's hard to beat: [100+ payment methods across 195 countries](https://stripe.com/pricing), a well-documented REST API, and SDKs in every language that matters. But it's worth saying plainly: **Stripe does not have a product catalog in the sense a commerce backend does.** Its "Products" and "Prices" objects exist to describe what a Checkout Session or subscription charges for, not to model variants, stock levels, or a storefront's browsing experience.
That makes Stripe the right choice when payments are the whole problem (a SaaS paywall, a one-off checkout, invoicing) and the wrong one to reach for alone when you need a real catalog with inventory, since you'd be building that layer yourself on top of it. [Stripe's card processing runs 2.9% + 30¢ for US domestic cards](https://stripe.com/pricing), with add-ons like Billing (subscription management, starting around $620/month on the annual plan or 0.7% of billing volume pay-as-you-go) and Tax (starting around $90/month) priced separately. Auth is a secret/publishable API key pair, among the simplest of any API here, and there's no cost-based rate limiting to think about the way there is with Shopify's GraphQL API.
If you only need "accept a payment" and nothing else, Stripe Checkout or Payment Links get you there without writing a catalog layer at all. We cover exactly where that stops being enough in [how to sell online with Stripe](/blog/how-to-sell-online-with-stripe).
## Medusa: Open-Source, TypeScript-Native Commerce Backend
[Medusa](https://medusajs.com/) is a modular commerce engine built in Node.js and TypeScript, organized into separate modules (cart, payment, product, pricing, promotion, order, inventory, fulfillment, tax) that you can use individually or together. The API is REST, authenticated with publishable keys for storefront calls and secret keys plus JWT sessions for admin access. It's MIT-licensed and free to self-host, with no license or transaction fees on the open-source path.
The managed option is [Medusa Cloud](https://medusajs.com/pricing), which moved to general self-serve availability in 2026: a Develop plan around $29/month, Launch around $99/month, and Scale around $299/month, plus usage-based add-ons for compute, preview environments, and data transfer that can push the real bill above the sticker price depending on how you deploy. Autoscaling, automatic backups, and zero-downtime deploys start at the Launch tier, not Develop, which matters if you're evaluating the cheapest plan as your production target. For a fuller cost breakdown and alternatives, see our [Medusa alternatives guide](/blog/medusa-alternatives).
## Saleor: GraphQL-Only, Python-Backed
[Saleor](https://saleor.io/) is open source and built on Python and Django, but the API surface you actually work with is entirely GraphQL: there's no REST alternative at all, which is a meaningfully different developer experience from Medusa or Shopify's older REST endpoints. If your team already thinks in GraphQL (single request for exactly the fields you need, a typed schema, one endpoint to reason about) that consistency is Saleor's strongest pitch.
Saleor's cloud plans are enterprise-shaped: [Saleor Cloud's Select tier lists at $1,599/month](https://saleor.io/pricing) for stores up to $200,000 in monthly GMV, with usage fees on top past that ceiling; Volume runs $3,999/month for higher volume, and Enterprise is custom-quoted. There's a free Sandbox tier for prototyping before you commit to either. That pricing shape puts Saleor Cloud closer to commercetools than to Medusa Cloud or Swell on cost, even though the open-source core is free to self-host either way. See our [Saleor alternatives guide](/blog/saleor-alternatives) if the cloud pricing is the sticking point.
## commercetools: Enterprise MACH, Custom-Quoted
[commercetools](https://commercetools.com/) is one of the platforms that popularized the "composable commerce" and MACH (microservices, API-first, cloud-native, headless) framing in the first place, and its API reflects that: both REST and GraphQL are available, authenticated through OAuth 2.0 client credentials, built around fine-grained resource permissions and multi-region deployment. It's genuinely powerful for a large, multi-brand, multi-market retailer with an engineering org to match.
commercetools doesn't publish pricing; [its own pricing page](https://commercetools.com/pricing) states the model is "order-based" rather than GMV-based and routes everyone to a sales conversation. Third-party cost analyses that track real deals [put typical enterprise contracts somewhere between roughly $40,000 and $300,000+ a year](https://costbench.com/software/enterprise-ecommerce/commercetools/) depending on order volume, SKU count, and which add-ons (advanced B2B APIs, extra regions, premium support) you need, but treat that as a rough planning number, not a quote. If your team doesn't have the headcount to run a true composable stack, our [commercetools alternatives guide](/blog/commercetools-alternatives) covers options with published pricing and no sales cycle.
## BigCommerce: SaaS Reliability, Real API Access
[BigCommerce](https://www.bigcommerce.com/) sits between Shopify and the open-source options: it's a hosted SaaS platform, but it exposes a genuinely capable **REST Management API** for products, orders, customers, and inventory, plus a **GraphQL Storefront API** for headless frontends. One detail worth knowing if you're planning a headless build: the GraphQL Storefront API is [read-only for catalog data](https://developer.bigcommerce.com/docs/storefront/graphql); writes (creating or updating products) still go through the REST API, so a fully headless BigCommerce build typically uses both APIs, not just the GraphQL one.
Pricing runs $29/month (Core, annual) up to $299/month (Scale, annual), with a custom Enterprise tier ("Performance") starting around $1,499/month for higher-volume merchants, and each tier scales automatic plan upgrades to trailing-twelve-month sales. Auth is a simple API token (`X-Auth-Token` header) scoped per store. We go deeper on where BigCommerce fits against the field in our [BigCommerce alternatives guide](/blog/bigcommerce-alternatives).
## Swell: Fast Headless Setup for Small Teams
[Swell](https://www.swell.is/) splits its API in two: a **Backend API** with full CRUD access via a secret key for server-side use, and a **Frontend API** with restricted, public-key access safe to call from the browser. That split is a sensible default for teams who don't want to think hard about which endpoints are safe to expose client-side. Headless storefront hosting is included at every tier, and there's a dedicated Checkout API for custom payment flows.
Pricing is revenue-tiered: [$29/month (Starter) for stores under $50K in annual sales, up to $2,250/month (Unlimited) for stores approaching $10M](https://www.swell.is/pricing), with overage fees (2% down to 0.4% depending on tier) once you exceed your plan's sales ceiling. That structure rewards small stores with a genuinely low entry price and gets expensive fast if you outgrow a tier mid-year without upgrading ahead of it.
## Square: One API for Online and In-Person
[Square](https://squareup.com/) is the pick if in-person sales are actually part of your business, not a hypothetical. The [Developer API](https://developer.squareup.com/) covers Orders, Catalog, and Inventory as REST endpoints that work identically whether the sale happened at a physical terminal or through an online storefront, with a GraphQL Explorer available in beta for querying the same data differently. Auth is OAuth access tokens, standard for a platform that also has to authorize physical hardware.
[Square's US online processing rate is 2.9% + 30¢](https://squareup.com/us/en/payments/our-fees) across its Free, Plus, and Premium software tiers, meaning the API-level processing cost doesn't change as you upgrade, only the software features do. If your roadmap is online-only, this consolidation doesn't buy you much over Stripe or a commerce-native API; it earns its place specifically when a customer might buy the same product both online and at a register.
## REST vs. GraphQL, in Actual Requests
Docs pages describe the difference; seeing both side by side for the same task, fetching a page of products, makes it concrete. A REST call against Medusa's Store API looks like this:
```bash
curl 'https://your-medusa-app.com/store/products?limit=10' \
-H 'x-publishable-api-key: pk_...'
```
One endpoint, a fixed response shape, query parameters for filtering and pagination. The same task against Shopify's GraphQL Admin API looks like this:
```graphql
query GetProducts {
products(first: 10) {
nodes {
id
title
variants(first: 3) {
edges { node { id displayName } }
}
}
}
}
```
One endpoint for everything, but you name every field you want, including nested variant data in the same round trip that would be a second REST call on most systems. That's GraphQL's real pitch for storefronts with deep, nested data needs. The cost is the point-based rate limiting described in the Shopify section above: a platform has to price that flexibility somehow, and Shopify does it by charging more for queries that ask for more.
## Rate Limits: The Detail Every Pricing Page Skips
Pricing pages sell you on features. None of them lead with rate limits, and that's exactly where a proof-of-concept quietly breaks in production. A few things worth confirming before you build against any API on this list, not just trusting the marketing copy:
- **Is the limit request-based or cost-based?** Shopify's GraphQL Admin API charges by query complexity, not by request count, which changes how you write queries, not just how often you call them.
- **Does bulk data export bypass the live limit?** Shopify's Bulk Operations API does; check whether your chosen platform has an equivalent before you plan a nightly full-catalog sync against the standard endpoint.
- **What happens to a self-hosted API under load?** Medusa and Saleor's open-source cores don't have a vendor-imposed rate limit at all: the limit is whatever your own infrastructure can handle, which is a different kind of risk (yours to manage) rather than a solved problem.
- **Does the vendor publish numbers at all?** commercetools and BigCommerce both publish rate-limit documentation but the exact figures vary by plan and change with the product, so confirm current numbers in each vendor's docs rather than trusting a blog post (including this one) to still be accurate by the time you build.
## A Note for EU and UK Sellers
If tax is part of what you're integrating, name your jurisdiction before you pick a tool. Stripe Tax and Square's built-in tax settings can calculate and collect VAT once configured, but neither one automatically registers you or files returns; the VAT registration thresholds and filing obligations in each EU country, and separately in the UK, stay your responsibility regardless of which API calculated the number. commercetools and Saleor both support external tax providers rather than shipping one natively, so budget for that integration separately if you're building for EU or UK customers on either platform.
## Where Your Next Store Fits
We built [Your Next Store](https://yournextstore.com) because most of the options above ask you to choose between "fast to start" and "you own the backend." The managed platform exposes a REST API (documented with OpenAPI) covering products, variants, carts, orders, customers, inventory, and search, authenticated with a scoped `YNS_API_KEY`. **(Bias flag: this is our product.)**
The open-source [storefront template](https://github.com/yournextstore/yournextstore) talks to that API through the `commerce-kit` npm package rather than to Stripe directly: Stripe only handles payment processing behind the YNS backend, so the storefront has zero Stripe dependencies of its own. What's different from the rest of this list: an AI assistant (we call it Elliot) can scaffold and edit the storefront by chat, the whole stack is TypeScript end to end, and every plan carries 0% platform transaction fees, only Stripe's standard processing on top. Paid plans start at $30/month (Starter), same order of magnitude as Medusa Cloud's Develop tier or BigCommerce's Core plan.
**Where we're honestly behind:** no GraphQL API today, REST only. No public rate-limit page as detailed as Shopify's, because we haven't needed one at our current scale, ask us directly if you're planning high-volume server-to-server sync. And there's no enterprise MACH ecosystem the way commercetools has built one over a decade; if that's genuinely your requirement, commercetools or Saleor Enterprise are the more mature choice.
Your Next Store is open source. Star the repo on GitHub: [github.com/yournextstore/yournextstore](https://github.com/yournextstore/yournextstore)
**Want a commerce API with an AI assistant that can build the storefront around it?** Get a scoped API key and a working store in minutes, not a sales call.
## How to Choose
**You need to take payments and nothing else:** Stripe or Square, whichever matches your in-person/online mix.
**You want the biggest app ecosystem and don't mind GraphQL:** Shopify.
**You're a TypeScript team that wants to own an open-source backend:** Medusa, or [Your Next Store](https://yournextstore.com) if you also want an AI assistant driving the storefront.
**You're GraphQL-only by conviction and building composable:** Saleor.
**You're a large, multi-brand enterprise with a platform team:** commercetools.
**You want SaaS reliability with real API access, not full headless commitment:** BigCommerce.
**You're small, fast-moving, and want headless without the setup overhead:** Swell.
## FAQ
### Is Shopify's API free to use?
The API itself is included with every Shopify plan ($29-$399/month depending on tier and billing cycle as of September 2026); you're not charged separately per API call at normal usage. Some endpoints and higher GraphQL rate-limit tiers are reserved for Shopify Plus. Confirm current plan pricing on [Shopify's pricing page](https://www.shopify.com/pricing) before committing, since it changes.
### Can I use Stripe as my entire ecommerce backend?
You can process payments entirely on Stripe, but Stripe doesn't model a product catalog with variants, stock counts, or a browsing experience: its Products and Prices objects exist to describe what a checkout charges for. Most teams either pair Stripe with a commerce backend API (Medusa, Saleor, commercetools, BigCommerce, or Your Next Store all use Stripe or a similar processor underneath) or build that catalog layer themselves on top of Stripe directly.
### What's the difference between a REST and a GraphQL ecommerce API?
REST exposes fixed endpoints that return a predetermined shape of data, so complex screens often need multiple calls. GraphQL exposes one endpoint where you request exactly the fields you need in a single query, which is efficient for storefronts but shifts complexity into query design and (as with Shopify) cost-based rate limiting. Saleor is GraphQL-only; Medusa and Swell are REST; Shopify, BigCommerce, and commercetools offer both to different degrees.
## Related Blog Posts
- [Best Ecommerce Platform for Developers in 2026](/blog/best-ecommerce-platform-for-developers)
- [14 Best Headless Ecommerce Platforms (2026), Compared](/blog/best-headless-commerce-platforms)
- [Headless Checkout: How It Works and Which to Choose](/blog/headless-checkout)
- [How to Sell Online with Stripe in 2026: 5 Options](/blog/how-to-sell-online-with-stripe)
- [Composable Commerce: What It Is and the Best Platforms](/blog/composable-commerce)
The best ecommerce API isn't the one with the longest feature list: it's the one whose model of "product," "order," and "payment" already matches how your business actually works. Get that match right and the integration is a few days of reading docs. Get it wrong and you'll spend the next year fighting the API's opinions instead of shipping your own.
Want a commerce API with an AI assistant that scaffolds the storefront for you? [Try Your Next Store](https://yournextstore.com/) and get a scoped API key in minutes.