Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 10 Complete, well-documented, and agent-ready

Airwallex Payment Acceptance APIThe Airwallex Payment Acceptance API enables businesses to accept online payments globally. Supports credit...85.3 Shopify Checkout APIThe Checkout API from Shopify — 36 operation(s) for checkout.83.9 Shopify Checkout UI Extensions APICheckout UI extensions let app developers build custom functionality that merchants can install at defined ...83.9 Shopify Checkouts APIThe Checkouts API from Shopify — 6 operation(s) for checkouts.83.9 Stripe Checkout APICheckout is a low-code payment integration that creates a customizable form for collecting payments. You ca...81.6 Tabby Checkout APICheckout is a whole process of customer data collection and payment authorization.77.1 Square Checkout APIThe Checkout API from Square — 5 operation(s) for checkout.75.4 Mirakl Checkout APIThe Checkout API from Mirakl — 1 operation(s) for checkout.72.5 Klarna Checkout APIThe Checkout API from Klarna — 3 operation(s) for checkout.71.8 Clerk Checkouts APIUsed to interact with the checkout flow.71.4

Strong 14 Solid coverage with minor gaps

DOKU Checkout APIDOKU-hosted checkout page (non-SNAP).65.4 Classy PayPayment and embedded-checkout service behind GoFundMe Pro donation and registration flows. Ships a JavaScri...64.7 Peach Payments Checkout APIHosted, Embedded, and Embedded Express checkout sessions.64.4 Swell Checkout APICart conversion and order placement.63.6 Microsoft Word Checkout APIOperations for checking in and out files62.7 Mollie APIThe Mollie API is a REST API using HAL (application/hal+json) over HTTPS at api.mollie.com. It covers 124 d...59.6 1Fort Checkout APICheckout and payment session endpoints. **Access:** public; no authentication required.58.2 Paid Checkouts APIThe checkouts API from Paid — 2 operation(s) for checkouts.56.8 BigCommerce Checkout APIThe Checkout API from BigCommerce — 1 operation(s) for checkout.56.4 EVEDEX Checkout APIThe Checkout API from EVEDEX — 1 operation(s) for checkout.55.7 Mastercard Checkout SolutionsDeveloped by Mastercard and built upon EMV_ Secure Remote Commerce standards1, Mastercard Checkout Solution...55.7 Mastercard Unified Checkout SolutionsUnified Checkout Solutions offer products that cater to a suite of digital commerce use cases to support a ...55.7 Genome Hosted Payment PageRedirect checkout hosted by Genome, opened with an HS256 JWT signed with the SHA-256 digest of the payment ...55.4 Interswitch Checkout APIHosted checkout payment initiation54.8

Developing 47 Usable, with meaningful gaps to close

Codapay Hosted Payment Page APIInitiate a payment request, redirect the shopper to Coda's hosted payment page, receive the transaction com...53.6 Coinflow Checkout APIThe checkout API from Coinflow — 33 operation(s) for checkout.53.5 Klasha Payment Link APIGenerate payment links for merchants and sub-merchants to collect payments without a code integration, from...51.3 Hotmart Payment Link APICreate and list Hotmart payment links, attach additional offers and plans to a link, and charge a saved pay...50.7 Coins.ph Checkout APICheckout creation and management50.5 Paga ConnectOAuth-based hosted checkout that lets third parties charge a customer's Paga wallet and read account/mercha...50.4 Neon Commerce Checkout APIThe Checkout API from Neon Commerce — 3 operation(s) for checkout.49.9 Yuno Payments APICore Yuno Payments API — customers, checkout sessions, payments, refunds, captures, subscriptions, payouts,...49.7 Google Pay APIEnables integration of the Google Pay payment method into web applications, allowing merchants to accept pa...49.2 Google Pay API for AndroidEnables integration of Google Pay into Android applications, allowing users to pay with cards saved to thei...49.2 Google Universal Commerce ProtocolA standard for securely and efficiently exchanging commerce data between merchant and platform systems to e...49.2 Elastic Path Checkout APIThe checkout workflow ties together many of the key concepts covered in this section. When a customer initi...48.9 WooCommerce Checkout APISubmit and manage the checkout process for the current shopper48.7 PointCheckout Checkout APIAPI endpoints for checkout management.48.2 Mercado Pago Checkout APIFull server-side checkout control. Tokenise cards client-side, create a payment server-side, manage 3DS cha...48.1 Mercado Pago Checkout BricksComposable web components ("bricks") merchants embed in their own UI — card form, wallet, payment-method pi...48.1 Mercado Pago Checkout ProHosted, pre-configured checkout experience. Merchants create a preference via API, then redirect the buyer ...48.1 Klump APIThe Klump REST API lets a merchant verify transactions, sync commerce product catalogs, create Klump Access...47.5 GetPaid Checkouts APIPayment checkout sessions for one-time payments that the buyer can complete using Getpaid hosted checkout.47.3 JustiFi Checkouts APICheckouts can be used to collect payments directly via API, or using our Checkout component. You can use a ...47.3 Shift4 CheckoutShift4 Checkout provides a drop-in, frictionless checkout overlay that can be added to a website with copy-...46.8 Taylor's Library Koha REST APIREST API of the Taylor's University Library catalog, served under /api/v1 by a Koha integrated library syst...46.3 SumUp Checkouts APICheckouts represent online payment sessions that you create before attempting to charge a payer. A checkout...46.0 Unlock Protocol Checkout APIThe Checkout API from Unlock Protocol — 2 operation(s) for checkout.45.9 PayU India REST APIREST API for payment processing in India. Supports hosted checkout, payment links, recurring payments, subs...45.8 ZeroSettle Checkout APICreate checkout sessions and payment intents for web purchases45.7 Ivy API (Open Banking)The 2023-01-01 Ivy API for Open Banking pay-ins and Manual Bank Transfer. Checkout sessions, orders, custom...45.6 Schematic Checkout APIThe checkout API from Schematic — 7 operation(s) for checkout.45.6 Zoca Checkout APIThe Checkout API from Zoca — 14 operation(s) for checkout.44.5 Sunbit JavaScript SDKHosted, asynchronously loaded browser SDK (the SUNBIT global) that renders Sunbit's client-side surfaces: t...44.2 Sunbit Partner APIServer-to-server REST API for Sunbit partners and SaaS platforms. Covers pre-qualification links, "As Low A...44.2 Bread JavaScript SDKBrowser-side JavaScript SDK that exposes the BreadPayments object for rendering the Bread modal, embedded p...44.1 Australia Post Delivery Choices APIAllows customers to select preferred delivery options at checkout, including delivery speed, delivery or co...44.0 SAP Commerce Cloud Checkout APICheckout and payment operations44.0 Beacon Roofing Supply Checkout APIThe Checkout API from Beacon Roofing Supply — 14 operation(s) for checkout.43.4 Coinbase Checkouts APICreate and manage reusable checkout pages for accepting recurring or standardized payments.43.2 ChargeAfter Checkout APIThe Checkout API from ChargeAfter — 2 operation(s) for checkout.42.9 Shoppable Checkout APIThe Checkout API from Shoppable — 1 operation(s) for checkout.42.9 LianLian Global Checkout APIThe Checkout API from LianLian Global — 1 operation(s) for checkout.42.8 Slice Orders APICreate, retrieve, update, and cancel orders against a Slice shop.42.6 Commercetools Checkout APIThe commercetools Checkout API provides programmatic control over Checkout application configurations withi...41.8 Verifone Checkout APICreate, retrieve, update, and manage checkout sessions. A checkout session generates a hosted payment page ...40.8 Cubby Storefront APIThe Cubby Storefront API is the public, unauthenticated-tenant-facing slice of the Cubby platform used to p...40.6 True Fit Checkout APIAn endpoint for tracking checkout events.40.6 Coinbase Commerce Checkouts APICreate and manage single-use hosted payment checkouts40.4 Kredivo Checkout APIInitiating a Kredivo installment checkout (2-click, 0-click, QR, EDC).40.3 MODIVO Storefront GraphQL APIThe GraphQL endpoint that powers the MODIVO storefront and mobile applications, exposed at https://modivo.p...40.3

Thin 95 Limited public surface area

Emerging 59 Early or largely undocumented

Minimal 1 Almost no public developer surface

Afterpay Checkout APICreate and confirm Afterpay checkouts for merchant integrations.9.3

Companies reaching this through an API (156)

These companies publish an API, specification or operation carrying “Checkout” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

100 Thieves 1Fort 4th & Heart Abcoffee Adrenaline Shoc Affirm Afterpay AG1 Agilitas Sports Agnikul Cosmos Agrovision Airwallex Alliance Data Systems (Bread Financial Holdings) Also Arlettie Augustus Australia Post Bancontact Bartesian Beacon Roofing Supply Beekeeper's Naturals Bespoken Spirits BillDesk Black Buffalo Boat Lifestyle Bobbie Bombas Boulevard Bread Financial BrewDog Cacheflow Canada Post Cash App Cerebelly Cielo Cirkul Clerk Clover Coda Payments Coinbase Coins.ph Cometeer commercetools Create Wellness Creem Crystallize Cubby Cure Hydration Deep Sentinel Deliverect

Show all 156 companies ↓

DOKU Dolls Kill ECOMMPAY Elastic Path EVEDEX Eventzilla Feastables Flip Flying Embers Fnatic Genome Glowbar GoFundMe Grab Hero Bread HNI Hotmart Hubble Contacts Hyperice InkSoft Interswitch iZotope Johnnie-O Johrh Julep Beauty Just Eat JustiFi Kakao Kann KI das? Sponsoring Agent Kate Farms Kite Hill Kizik konfetti Leaft Foods Lemon Perfect Lemon Squeezy LianLian Global Linsy LiqPay Maisonette Makeup by Mario Mastercard Mercado Libre Microsoft Word Mirakl ModRetro Mud\Wtr NetBird Nu (Nubank) Oatside Off Grid Stores - All Things Off-Grid Solar Oishii Olipop Omaze Open (open.money) Paga PagBank Paid Paytm Perpay PhonePe Polar Poppi Poppy Handcrafted Popcorn Prime Hydration Quaderno Quip NYC Rad Power Bikes Rael Ravelin Rhone Apparel Rock The Bells Roundy's SAP Commerce Cloud Schematic Shopify Signifyd Slice SMKlog Spree Commerce Steam Stripe Supergoop! Tabby Tabit Taylor's University Tecovas Therabody True Fit TRUFF Underdog Unlock Protocol UNTUCKit Upway UrbanStems Verifone Voyage Foods Willie's Reserve Wix WooCommerce WorldFirst Worldline ZBiotics ZeroSettle Zoca Zonos

Score breakdown

Frequency

70.2

log-scaled weighted occurrences

Breadth

2.7

spread across providers

Quality lift

49.6

mean composite of providers using it

Cohesion

16.9

strength of nearest seed neighbor

Where this tag sits

E-Commerce broader Payments broader

Where this tag comes from

Api tag233

Provider tag104

Openapi tag42

Openapi op tag141

Cohort brief

Auto-generated

The 101 providers in the APIs.io catalog tagged Checkout, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

101

all scored

Mean Kin Score

41.1

+18.2 vs catalog 22.9

Mean Agent Readiness

26.7

+14.8 vs catalog 11.9

Spread

10–75.4

median 42.7 · σ 14.8

How the 101 split by band

Exemplar 4Strong 14Developing 36Thin 27Emerging 18Minimal 2

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	50.5	23.2	+27.3	101
Contract Quality	37.8	17.6	+20.2	101
Operational Transparency	31.1	13.7	+17.4	101
Access Clarity	40.5	26.5	+14	101
Discoverability	70.1	58.1	+12	101
Contract Governance	11.3	6.3	+5	101

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	21%	14%	+7
MCP server (first-party)	16%	12%	+4
Agent Skills	0%	0%	0
OAuth scopes	20%	11%	+9
Security	99%	98%	+1
Arazzo workflows	5%	2%	+3
Governance rules	21%	14%	+7

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Square 75.4
2 Hilt 72.4
3 Klarna 71.8
4 ThriveCart 67.5
5 Commerce Layer 65.1
6 Bolt Financial 65
7 ClickFunnels 64.4
8 Peach Payments 64.4
9 Swell 63.6
10 Gr4vy 61.9

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Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Call it yourself

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This tag

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All tags

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As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/checkout"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/checkout/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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Checkout

Providers using this tag (104)

APIs with this tag (226)