Checkout

Checkout is a global payments platform offering a suite of APIs and tools that enable businesses to accept, process, and manage online payments. It provides unified payments API, hosted payment pages, mobile SDKs, fraud detection, authentication, issuing, payouts, and advanced features like AI-driven intelligent acceptance and real‑time account updates. Checkout serves enterprises across e‑commerce, marketplaces, travel, gaming, fintech, and more, delivering high‑performance, secure, and scalable payment solutions worldwide.

Checkout is listed with 4 APIs on the APIs.io network, including Checkout API, Connect API, and 2 more. Tagged areas include Payments, Fintech, E-Commerce, and Global.

The Checkout catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

Checkout’s developer surface includes authentication, support, signup flow, pricing, engineering blog, getting-started guide, documentation, and 25 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.2/100 thin ▼ -9.0 Agent 34/100 agent ready Heartbeat 99/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessEnterprise

4 APIs

Payments Fintech E-Commerce Global

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 34.2/100 · thin

Contract Quality 4.8 / 19

Developer Ergonomics 6.3 / 15

Access Clarity 4.7 / 15

Operational Transparency 2.8 / 10

Contract Governance 2.0 / 9

Discoverability 4.7 / 8

Regulatory Posture 4.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 25.4 — up to +18.7 composite points
Access Clarity scores 31.6 — up to +13.7 composite points
Developer Ergonomics scores 41.7 — up to +11.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/checkout/apis.yml: open an issue on github.com/api-evangelist/checkout to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 4

Individual APIs this provider publishes, each with its own machine-readable definition.

Checkout API

Checkout API provides payment processing endpoints as documented in the API reference.

Checkout Checkout API

The Checkout API API from Checkout — 1 operation(s) for checkout api.

Checkout Connect API

The Connect API from Checkout — 1 operation(s) for connect.

Checkout Payments API

The Payments API from Checkout — 1 operation(s) for payments.

Checkout API pricing

Pricing Plans 1

Published pricing tiers and plan structures.

Checkout Plans Pricing

0 plans

PLANS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Checkout Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Checkout Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Checkout Context

1 classes · 3 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Checkout API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

PostRequest

3 properties

JSON SCHEMA

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Checkout Authentication

1 scheme

SECURITY

Checkout Domain Security

TLSv1.3 · DMARC

SECURITY

Checkout Vulnerability Disclosure

Bugcrowd

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: checkout
name: Checkout
accessModel:
  pricing: enterprise
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Enterprise
  confidence: low
  probe_state: gated
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://cdn.prod.website-files.com/64db80a5e88c6b1723ff760b/67e2bd4ddf0a87a1400c020d_website-thumbnail.jpg
description: Checkout is a global payments platform offering a suite of APIs and tools that enable businesses to accept, process,
  and manage online payments. It provides unified payments API, hosted payment pages, mobile SDKs, fraud detection, authentication,
  issuing, payouts, and advanced features like AI-driven intelligent acceptance and real‑time account updates. Checkout serves
  enterprises across e‑commerce, marketplaces, travel, gaming, fintech, and more, delivering high‑performance, secure, and
  scalable payment solutions worldwide.
url: https://raw.githubusercontent.com/api-evangelist/checkout/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-08 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-08'
modified: '2026-10-08'
tags:
- Payments
- Fintech
- E-Commerce
- Global
tags_raw:
- Payments
- Fintech
- API
- E-commerce
- Global
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/checkout-plans-pricing.yml
- type: Spectral
  url: rules/checkout-rules.yml
- type: JSONLD
  url: json-ld/checkout-context.jsonld
- type: Vocabulary
  url: vocabulary/checkout-vocabulary.yml
- type: Webhooks
  url: asyncapi/checkout-webhooks.yml
- type: DataModel
  url: data-model/checkout-data-model.yml
- type: Security
  url: security/checkout-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/checkout-authentication.yml
- type: Conformance
  url: conformance/checkout-conformance.yml
- type: LLMsTxt
  url: llms/checkout-llms.txt
- type: WellKnown
  url: well-known/checkout-well-known.yml
- type: Hosts
  url: hosts/checkout-hosts.yml
- type: Vendors
  url: vendors/checkout-vendors.yml
- type: SDKs
  url: packages/checkout-packages.yml
- type: Packages
  url: packages/checkout-packages.yml
- type: TrustCenter
  url: https://trust.checkout.com/
- type: TermsOfService
  url: https://www.checkout.com/legal/terms-and-policies
- type: Support
  url: https://support.checkout.com
- type: StatusPage
  url: https://identity.checkout.com/app/statuspage_saml/exk1izzuix2ptvgqk0h8/sso/saml?SAMLRequest=fZLLbsIwEEV%2FJTuvnPfDWASJFlVFoioC2kU3yHUcYkHskHEQ5eubhFJoFyws2dK9Z%2B7MeAis3FV03JhCLcS%2BEWCsMYCojdTqUStoSlEvRX2QXLwtZikqjKmAOk7JFNsIGwwzDVTdVWoHoD0t0OFnJ7ImLVAq1tGuXpkJZaT5snkh%2BFY3xua6dFhVOVfcuueI49aTp1Mjj35lDpv91i3IbxVkPemaiz57inK2g7bgdJKidZKLgISej3MS%2BTgUCcHEHeQ49qIwicmAhTFppQCNmKq2pjIp8l0%2Fxp6LXbLyXBpFNAw%2BkDWvtdFc7x6kyqTapKipFdUMJFDFSgHUcLocv8yob7v08ywC%2BrxazfH8dblC1ruooW%2B%2BFSDrWO4U0C78fRK7rODWUt33VD9R0WjYqWnfXj26DJ2TjAwGcY4zPw9xyLiHSRb7mLOM5V4SBBn%2Fv86hcws6v%2F7%2BldE3&RelayState=https%3A%2F%2Fcheckout-services.statuspage.io%2F&SigAlg=http%3A%2F%2Fwww.w3.org%2F2001%2F04%2Fxmldsig-more%23rsa-sha256&Signature=bc0Uml1jiH3UR8BJDHFDVIDwkTg%2FUMkz1HyfQJZTSgjFUDb87cGZFo1HnSVjCjNyGnb7P756QWVdqy%2B5S3SSaAbVDOcaMPjm3dXbajeGe8EIb3CfyIEUdyOeoJ6caRoqTjo0zzsRIzOma4x6jYv6wJIwPGVGNJ1ZZ3uISuSoom4sGoYtBGbcQpYxsXdgFcDB6pqSl%2FVpgAoaZRjodT%2FlaeDPTFSNqXY4Z3lunCl0iKSkhEQ80epunGS9gWMPdv%2Bp%2F%2FFl6YdKHWV8vsN3Jgh0uZIfino1gE42Bt9tQDNasLU04pP7Yvr6nR4x%2Bpo9Kgm0b2Uee27rCRxpYaU9PVuvDQ%3D%3D
- type: SignUp
  url: https://www.checkout.com/events/register-interest-padel
- type: PrivacyPolicy
  url: https://www.checkout.com/legal/privacy-notice
- type: Pricing
  url: https://www.checkout.com/pricing
- type: Newsroom
  url: https://www.checkout.com/newsroom
- type: Leadership
  url: https://www.checkout.com/leadership
- type: Blog
  url: https://www.checkout.com/blog
- type: GettingStarted
  url: https://www.checkout.com/docs/card-issuing/card-program-setup
- type: Documentation
  url: https://docs.checkout.com/
- type: APIReference
  url: https://api-reference.checkout.com/
- type: GitHubOrganization
  url: https://github.com/checkout
- type: VulnerabilityDisclosure
  url: security/checkout-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/checkout-domain-security.yml
- type: Website
  url: https://www.checkout.com
apis:
- name: Checkout API
  description: Checkout API provides payment processing endpoints as documented in the API reference.
  humanURL: https://api-reference.checkout.com/
  aid: checkout:checkout-api
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/checkout-openapi-generated.yml
    x-provenance: generated
- aid: checkout:checkout-checkout-api-api
  name: Checkout Checkout API
  description: The Checkout API API from Checkout — 1 operation(s) for checkout api.
  humanURL: https://api-reference.checkout.com/
  tags:
  - Checkout API
  properties:
  - type: OpenAPI
    url: openapi/checkout-checkout-api-api-openapi.yml
  - type: JSONSchema
    url: json-schema/checkout-post-request-schema.json
- aid: checkout:checkout-connect-api
  name: Checkout Connect API
  description: The Connect API from Checkout — 1 operation(s) for connect.
  humanURL: https://api-reference.checkout.com/
  tags:
  - Connect
  properties:
  - type: OpenAPI
    url: openapi/checkout-connect-api-openapi.yml
  - type: JSONSchema
    url: json-schema/checkout-post-request-schema.json
- aid: checkout:checkout-payments-api
  name: Checkout Payments API
  description: The Payments API from Checkout — 1 operation(s) for payments.
  humanURL: https://api-reference.checkout.com/
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/checkout-payments-api-openapi.yml
  - type: JSONSchema
    url: json-schema/checkout-post-request-schema.json
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-08'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://identity.checkout.com/mcp
    status: 403
  - url: https://www.checkout.com
    status: 200
x-enrichment:
  date: '2026-10-08'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Checkout API — frequently asked questions

Does Checkout have an API?

Yes. APIs.io lists 4 APIs from Checkout, including Checkout API, Checkout Checkout API and Checkout Connect API, and 1 more.

Is there an OpenAPI specification for the Checkout API?

Yes. APIs.io indexes 4 OpenAPI specifications for Checkout, each linked for download from this page.

How do I authenticate with the Checkout API?

Checkout documents its authentication (1 scheme). The details are profiled on APIs.io as Checkout Authentication.

Is the Checkout API ready for AI agents?

Checkout has a Kin Score of 34.2 out of 100 (thin) and an Agent Readiness score of 33.8 (agent-ready), scored by API Evangelist on 2026-11-06.

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