# OpenRouter — API Agent Score

> Score: 94/100 (Grade: A+) | Domain: openrouter.ai | Rubric: 1.0.0 | Checked: July 24, 2026

OpenRouter scored 94/100 (A+), classified "ai-ready".

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

## Summary

- Overall: 94/100 (A+)
- Classification: ai-ready

## Category Scores

- API Design: 100/100 (A+)
- Developer Experience: 85/100 (A)
- Agent Discovery: 98/100 (A+)
- Agent Understanding: 96/100 (A+)
- Agent Usability: 92/100 (A+)

## Check Results

### API Design

- [pass] Machine-readable, versioned contract — Versioning declared (info.version="1.0.0") and url-versioning detected. Investigated: spec 100%, docs 100%.
- [pass] Auth declared & discoverable — Authentication required (global or on every operation). Investigated: spec 100%, docs 100%.
- [warn] Schema coverage & depth — 2844/2860 (99%) public params are fully typed (no any/**kwargs). Analyzer reports not all methods have a derivable input schema. Investigated: sdk 99%, spec 83%.
- [pass] Security & governance hygiene — No credential-shaped strings detected in spec. Investigated: spec 100%, wellknown 50%.
- [pass] Example coverage — 100% example coverage across params + responses. Investigated: spec 100%, sdk 100%, docs 0%.

### Developer Experience

- [pass] Self-service developer portal — Signup page at https://openrouter.ai/signup (CSR-rendered — body classifier inconclusive); free tier / sandbox documented in pricing/docs. Investigated: docs 100%.
- [pass] Quickstart present — Quickstart at https://openrouter.ai/docs/quickstart has a runnable sample in the .md variant (https://openrouter.ai/docs/quickstart.md). Investigated: docs 100%.
- [pass] Description completeness — 90% of operations + parameters have substantive descriptions. Investigated: spec 100%, sdk 91%.
- [pass] Changelog published — changelog documented in the docs site at https://openrouter.ai/api/changelog. Investigated: spec 100%, docs 100%, sdk 100%.
- [fail] Code samples in docs — No detectable code samples across 20 sampled docs pages. Investigated: docs 0%.

### Agent Discovery

- [pass] Docs reachable, not hard auth-gated — All 1 pages are publicly accessible. Investigated: docs 100%.
- [pass] Registry & SDK presence — Indexed on Context7 (websites/openrouter_ai, 7382 snippets). Investigated: docs 100%, sdk 100%, cli 0%, mcp 0%, wellknown 0%.
- [warn] llms.txt present, valid & comprehensive — llms.txt contains parseable links but doesn't fully follow the proposed structure: https://openrouter.ai/docs/llms.txt: No blockquote summary found. Investigated: docs 92%, sdk 0%.
- [pass] Crawlable / AEO — Docs paths crawlable by all monitored AI agents. Investigated: wellknown 100%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — 16 distinct 4xx/5xx response codes documented. Investigated: docs 100%, sdk 100%, spec 50%.
- [pass] Operation purpose clarity — 100% of operations have a clear summary + operationId an agent can select on. Investigated: spec 100%.
- [pass] Agent-navigable, token-efficient docs — All 1 pages contain server-rendered content. Investigated: docs 100%.
- [pass] Agent instructions file (AGENTS.md) — Agent instructions file found at https://openrouter.ai/agents.md. Investigated: wellknown 100%.
- [pass] Docs structured data — JSON-LD Article markup on 19/19 assessed pages (100%) with dateModified present. Investigated: docs 100%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 3 surfaces (spec, docs, sdk) is 13% (threshold 35% for full credit).

### Agent Usability

- [pass] Idempotency documented — idempotency documented in the docs site at https://openrouter.ai/api/idempotency. Investigated: spec 100%, docs 100%, sdk 100%.
- [pass] Rate-limit signaling — rate-limit behavior documented in the docs site at https://openrouter.ai/api/rate-limits. Investigated: spec 100%, docs 100%.
- [pass] Pagination documented & consistent — Pagination params detected on 26 list endpoint(s). Investigated: spec 100%, docs 100%, sdk 78%.
- [pass] Sandbox separation — sandbox documented in the docs site at https://openrouter.ai/api/sandbox. Investigated: spec 100%, docs 100%, sdk 100%.
- [fail] Runnable collection with test scripts — No public Postman workspace discovered for the org. Investigated: platform 0%.

## Executive Summary

OpenRouter's API program shows strong fundamentals across design, discoverability, and documentation quality — partners can find and understand the surface well. The two areas that need immediate attention are runnable truth and onboarding speed: partners and their AI agents currently lack an executable, tested collection to build against confidently, and in-docs code samples that let developers go from reading to calling in minutes are missing. Closing these two gaps will materially accelerate partner integrations and reduce support burden.