Swell
Swell is a customizable, API-first headless commerce platform powering modern B2C, B2B, subscription, and marketplace experiences. It exposes a server-side Backend API for managing the full commerce data model (products, variants, carts, orders, payments, refunds, shipments, returns, subscriptions, accounts, invoices, coupons, promotions, gift cards, content, files, events, webhooks) plus a public-key client-side Frontend API for storefronts and an experimental GraphQL endpoint. The platform ships official Node and PHP libraries, a universal JavaScript SDK (Swell.js), headless storefront starters for Next.js (Horizon, verswell-commerce, nextjs-commerce) and Nuxt (Origin), a Swell Apps platform with CLI and Apps SDK for extending the data and logic layers via custom data models, events, notifications, webhooks, and edge functions running in 200+ locations, plus AI coding-agent skills and Claude Code plugins.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Swell the way a machine reads it — 125 machine-readable artifacts across 34 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Swell scores 68.3/100 (strong), with a separate agent-readiness read of 48/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Swell
Each block below is one kind of artifact we hold for Swell. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 34
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Swell GraphQL API
Experimental (alpha) GraphQL endpoint that exposes a curated subset of the storefront commerce model — products, attributes, categories, accounts, sessions, carts, orders, payme...
Swell Webhooks
Event-driven HTTP callbacks for cart, order, subscription, payment, account, and product lifecycle events. Configurable via the dashboard (Developer → Webhooks) or programmatica...
Swell Apps Platform
Swell Apps extend the platform with custom data models (added fields or new entities), events (triggering functions, webhooks, and notifications), edge functions deployed to 200...
Swell Account Addresses API
Saved shipping/billing addresses on an account.
Swell Account API
Authenticated customer account operations.
Swell Account Cards API
Saved payment cards on an account.
Swell Account Credits API
Store credit balances and transactions per account.
Swell Account Session API
Login, logout, and session recovery.
Swell Accounts API
Customer accounts including billing/shipping, saved cards, and history.
Swell Attributes API
Product attributes used for filtering and faceted search.
Swell Cart API
Session-scoped shopping cart for the current visitor.
Swell Carts API
Pending purchase requests that can be converted into orders.
Swell Categories API
Category tree and product taxonomy.
Swell Checkout API
Cart conversion and order placement.
Swell Content API
Pages, custom data models, and stored records.
Swell Coupons API
Coupon definitions with codes, redemptions, and discount rules.
Swell Events API
Event records emitted by the platform.
Swell Files API
Stored files (images, attachments) served via Swell CDN.
Swell Gift Cards API
Gift cards, debit transactions, and gift card products.
Swell Invoices API
Invoices generated for subscription billing cycles and B2B orders.
Swell Orders API
Customer orders, line items, financial totals, and lifecycle.
Swell Payments API
Payment transactions, refunds, and gateway settlement.
Swell Products API
Product catalog including variants, options, bundles, gift cards, and subscription products.
Swell Promotions API
Automatic promotion rules applied at cart and checkout.
Swell Purchase Links API
Shareable purchase links that prefill a cart.
Swell Refunds API
Refund records linked to a payment.
Swell Returns API
Customer return merchandise authorizations.
Swell Shipments API
Fulfillment shipments, tracking, and split fulfillment.
Swell Stock API
Stock levels and stock adjustments across locations.
Swell Store API
Public store settings, currencies, payment settings, and menus.
Swell Subscription Plans API
Plan templates that define billing schedule and price for recurring products.
Swell Subscriptions API
Recurring billing subscriptions and plans.
Swell Variants API
Variant-level inventory and pricing under a parent product.
Swell Webhooks API
Webhook subscriptions for receiving event callbacks.
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Postman Collections 2
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Swell Backend API
POSTMANSwell Frontend API
POSTMANOpen Collections 2
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Swell Backend API
OPEN COLLECTIONSwell Frontend API
OPEN COLLECTIONArazzo Workflows 13
Real integrations are rarely a single call. Arazzo describes the multi-step sequences — auth, then create, then confirm — so both a human and an agent can follow the choreography, not just the endpoints.
Multi-step API workflows described with the Arazzo specification.
Swell Create Cart and Apply Coupon
Create a backend cart with items and apply a coupon code to it.
ARAZZOSwell Build Cart and Convert to Order
Create a cart, populate its items, then convert it into an order.
ARAZZOSwell Find and Cancel Active Subscription
Locate an account's active subscription and cancel it, branching when none exists.
ARAZZOSwell Capture and Refund Payment
Record a payment against an order, then issue a refund against that payment.
ARAZZOSwell Create Category and Product
Create a category and then create a product assigned to that category.
ARAZZOSwell Create and Verify Product
Create a product in the catalog and immediately retrieve it to confirm it was stored.
ARAZZOSwell Create and Verify Subscription
Create a recurring subscription for an account and product, then read it back.
ARAZZOSwell Find-or-Create Customer and Order
Look up a customer by email and reuse it or create it, then place an order.
ARAZZOSwell Onboard Customer and Place Order
Create a customer account and immediately place an order for that account.
ARAZZOSwell Storefront Validate and Apply Coupon
Validate a coupon code, then apply it to the session cart only when it is valid.
ARAZZOSwell Storefront Add Item and Submit Order
Look up a product, add it to the session cart, then submit the cart as an order.
ARAZZOSwell Storefront Register and Log In
Create a storefront customer account and immediately authenticate the session.
ARAZZOSwell Storefront Adjust Cart Item Quantity
Read the session cart, then update the quantity of one of its line items.
ARAZZOScroll within the panel for all 13 ·
GraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Swell GraphQL API
Experimental (alpha) GraphQL endpoint that exposes a curated subset of the storefront commerce model — products, attributes, categories, accounts, sessions, carts, orders, payme...
GRAPHQLPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Swell Io Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Swell Io Finops
FINOPSFeatures 11
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Customizable, API-first core
Every commerce primitive — products, carts, orders, subscriptions — is exposed as a REST resource with full CRUD and rich querying.
Headless storefront
Build any storefront — Next.js, Nuxt, Astro, mobile, native — against the public-key Frontend API and Swell.js SDK.
Native subscriptions
First-class recurring billing with plans, trials, intervals, billing limits, and dunning baked into products and orders.
B2B and wholesale
Account groups, volume pricing, invoicing, and price lists for B2B and wholesale alongside D2C flows.
Marketplaces
Multi-vendor selling with split fulfillment, vendor accounts, and per-vendor reporting.
230 currencies, 170 languages
Built-in internationalization for global stores including priced currencies on higher plans.
Apps platform with edge functions
Extend the data model, events, notifications, and admin UI via the Swell Apps platform; functions run in 200+ locations with no cold start.
Custom wire protocol
Official Node and PHP libraries use a custom protocol on port 8443 for improved performance and caching versus plain HTTPS.
MongoDB-style querying
Powerful `where` filters with comparison, logical, and array operators, plus `expand`, `include`, `sort`, `search`, and field projection.
Webhooks with retries and IP allowlist
Reliable event delivery with documented retry schedule, auto-disable, and a published source-IP allowlist for inbound verification.
AI coding-agent skills
Official Claude Code plugins and AI coding-agent skills for Swell-aware development workflows.
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Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Swell Io Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Swell API Rules
SPECTRALSwell API Rules
SPECTRALJSON Schema 7
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Swell Account
JSON SCHEMASwell Cart
JSON SCHEMASwell Order
JSON SCHEMASwell Payment
JSON SCHEMASwell Product
JSON SCHEMASwell Subscription
JSON SCHEMASwell Webhook Subscription
JSON SCHEMAScroll within the panel for all 7 ·
JSON Structure 4
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Swell Account Structure
JSON STRUCTURESwell Order Structure
JSON STRUCTURESwell Product Structure
JSON STRUCTURESwell Subscription Structure
JSON STRUCTUREExamples 6
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Swell Account Create Example
EXAMPLESwell Cart Add Item Example
EXAMPLESwell Order Create Example
EXAMPLESwell Product Create Example
EXAMPLESwell Webhook Event Example
EXAMPLESecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 7
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Direct-to-consumer brands
Power D2C storefronts with full control over product, cart, checkout, and payment UX.
Subscription commerce
Box-of-the-month, SaaS-style, replenishment, and membership models with native subscription billing.
B2B and wholesale
Account-group pricing, invoicing, net terms, and bulk ordering for wholesale channels.
Multi-vendor marketplaces
Operate marketplaces with vendor onboarding, split fulfillment, and per-vendor payouts.
Headless omnichannel
Serve web, native mobile, in-store, and AI-agent surfaces from a single commerce backend.
AI-driven commerce
Back conversational commerce agents and AI shopping assistants with a clean, query-rich API.
Composable enterprise commerce
Combine Swell with best-of-breed CMS, search, payments, ERP, and analytics for enterprise stacks.
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Integrations 23
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Stripe
Default card processing and tokenization for most Swell stores.
PayPal
PayPal Express, billing agreements, and subscription processing.
Braintree
Multi-currency card processing.
Authorize.net
Card processing gateway.
Amazon Pay
Fast, account-based checkout via Amazon.
Apple Pay
Mobile wallet payments.
Google Pay
Digital wallet payments.
Klarna
Buy-now-pay-later installments.
Affirm
Buy-now-pay-later financing.
Paysafecard
Prepaid voucher payments.
QuickPay
Payment service provider integration.
99Minds.io
Omnichannel gift card and loyalty programs.
Klaviyo
Email, SMS, mobile push, and web marketing automation.
Mailchimp
Email marketing and automation.
Omnisend
Email and SMS marketing platform.
Churn Buster
Subscription retention and dunning.
Oppizi
Offline marketing campaign attribution.
Algolia
Hosted product search and discovery.
Avalara
Sales-tax calculation and filing.
Contentful
Headless CMS via the official Swell Contentful app.
Builder.io
Visual page-building CMS.
Vercel
Frontend deployment and edge hosting for Swell storefronts.
Anthropic Claude
Official Claude Code plugins and AI coding-agent skills for Swell development workflows.
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Solutions 6
Packaged solutions the provider offers on top of the raw API surface.
Packaged solutions this provider offers.
D2C Commerce
Headless storefronts for direct-to-consumer brands.
B2B Commerce
Wholesale catalogs, account groups, invoicing, and net-terms billing.
Subscriptions
Native recurring billing with flexible plans, trials, and limits.
Marketplaces
Multi-vendor selling with split fulfillment and per-vendor reporting.
Omnichannel
Serve web, native, in-store, and agent surfaces from a single commerce backend.
Enterprise
Custom-priced plans for merchants exceeding $10M annual sales with negotiated SLAs.
Resources
Every other property we hold for Swell — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 6
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 16
Pagination, idempotency, versioning, errors, and events
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Build 8
SDKs, sample code, and the tooling you integrate with
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Access & Security 2
Authentication, authorization, and security posture
Operate 6
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 14
Properties that don't map to a standard resource type
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← All providers · Data indexed from github.com/api-evangelist/swell-io · machine-readable index on apis.io