# Checkout — API Agent Score

> Score: 76/100 (Grade: B) | Domain: checkout.com | Rubric: 1.0.0 | Checked: July 24, 2026

Checkout scored 76/100 (B), classified "partially-ready".

[View full report](https://www.postman.com/ai/ai-ready-apis/company/checkout)
[All organizations](https://www.postman.com/ai/ai-ready-apis/llms.txt)

## Summary

- Overall: 76/100 (B)
- Classification: partially-ready

## Category Scores

- API Design: 87/100 (A)
- Developer Experience: 63/100 (C)
- Agent Discovery: 77/100 (B)
- Agent Understanding: 78/100 (B)
- Agent Usability: 74/100 (B)

## Check Results

### API Design

- [pass] Machine-readable, versioned contract — Versioning declared (info.version="v1.0.0") and header-versioning detected. Investigated: spec 100%, docs 100%.
- [pass] Schema coverage & depth — 5/5 (100%) public params are fully typed (no any/**kwargs). Analyzer confirms all methods have a derivable input schema. Investigated: sdk 100%, spec 67%.
- [pass] Auth declared & discoverable — authentication documented in the docs site at https://www.checkout.com/products/authentication-3ds. Investigated: spec 100%, docs 100%, wellknown 0%.
- [pass] Example coverage — README is present and includes a runnable quickstart. Investigated: sdk 100%, spec 0%, docs 0%.
- [fail] Security & governance hygiene — 2 credential-shaped strings detected in spec: bearer-jwt (×2). Investigated: spec 0%, wellknown 0%.

### Developer Experience

- [pass] Quickstart present — Quickstart at https://www.checkout.com/docs/get-started with a runnable first-call sample. Investigated: docs 100%.
- [pass] Description completeness — 78% description completeness (target 90%+). Investigated: spec 100%, sdk 100%.
- [pass] Changelog published — Newest official SDK activity 0 day(s) ago. Investigated: sdk 100%, spec 0%, docs 0%.
- [fail] Self-service developer portal — No signup page detected across conventional paths (/signup, /sign-up, /register, /get-started, /console/signup, /dashboard/signup, /try, /try-free, /free, /free-trial, /start, /start-free). Investigated: docs 0%.
- [fail] Code samples in docs — No detectable code samples across 20 sampled docs pages. Investigated: docs 0%.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (git_code_forgejo_org/actions_checkout, 634 snippets). Investigated: docs 100%, sdk 92%, cli 0%, mcp 0%, wellknown 0%.
- [warn] Docs reachable, not hard auth-gated — Server ignores Accept: text/markdown header (0/1 pages return markdown). Investigated: docs 75%.
- [warn] llms.txt present, valid & comprehensive — No llms.txt directive found in HTML of any of 1 pages. Investigated: docs 44%, sdk 0%.
- [warn] Crawlable / AEO — Sitemap present (1548 entries) but carries no lastmod values. Investigated: wellknown 75%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — 16 distinct 4xx/5xx response codes documented. Investigated: docs 100%, spec 50%, sdk 0%.
- [pass] Operation purpose clarity — 97% of operations have a clear summary + operationId an agent can select on. Investigated: spec 100%.
- [warn] Agent-navigable, token-efficient docs — No pages support .md URLs (0/1 tested). Investigated: docs 75%.
- [warn] Docs structured data — JSON-LD on 2/20 assessed pages, but coverage is sparse or dateModified is missing. Investigated: docs 50%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 2 surfaces (spec, docs) is 1% (threshold 35% for full credit).
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.

### Agent Usability

- [pass] Idempotency documented — Built-in retry machinery is present (grep-derived). Investigated: sdk 100%, spec 0%, docs 0%.
- [pass] Pagination documented & consistent — Pagination params detected on 19 list endpoint(s). Investigated: spec 100%, docs 100%.
- [pass] Sandbox separation — sandbox documented in the docs site at https://www.checkout.com/get-test-account. Investigated: spec 100%, docs 100%, sdk 100%.
- [fail] Rate-limit signaling — No rate-limit response headers documented. Investigated: spec 0%, docs 0%.
- [fail] Runnable collection with test scripts — No public Postman workspace discovered for the org. Investigated: platform 0%.

## Executive Summary

Checkout.com's API program shows strong API design fundamentals, but two areas create meaningful friction for partners and their AI agents: agent understanding and developer onboarding. Partners and coding agents currently lack the structured context files, runnable examples, and self-service portal they need to integrate confidently and quickly. Prioritizing an agent-ready documentation experience and executable onboarding materials will unlock faster partner integrations and reduce the support burden on your team.