# Plaid — API Agent Score

> Score: 72/100 (Grade: B) | Domain: plaid.com | Rubric: 1.0.0 | Checked: July 21, 2026

Plaid scored 72/100 (B), classified "partially-ready".

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

## Summary

- Overall: 72/100 (B)
- Classification: partially-ready

## Category Scores

- API Design: 91/100 (A+)
- Developer Experience: 76/100 (B)
- Agent Discovery: 81/100 (A)
- Agent Understanding: 73/100 (B)
- Agent Usability: 51/100 (D)

## Check Results

### API Design

- [pass] Machine-readable, versioned contract — API versioning documented in the docs site at https://plaid.com/docs/api/versioning/. Investigated: spec 100%, docs 100%.
- [pass] Auth declared & discoverable — Authentication required (global or on every operation). Investigated: docs 100%, spec 50%.
- [warn] Schema coverage & depth — Only 50% of operations have documented schemas. Investigated: spec 61%.
- [pass] Security & governance hygiene — No credential-shaped strings detected in spec. Investigated: spec 100%, wellknown 0%.
- [pass] Example coverage — 51% example coverage (target 80%+). Investigated: spec 100%, docs 100%.

### Developer Experience

- [pass] Quickstart present — Quickstart at https://plaid.com/docs/quickstart/ with a runnable first-call sample. Investigated: docs 100%.
- [pass] Code samples in docs — Code samples present on 11/20 pages across 1 language(s); broader multi-language coverage missing. Investigated: docs 100%.
- [pass] Description completeness — 0% description completeness. Investigated: spec 100%.
- [pass] Changelog published — changelog documented in the docs site at https://plaid.com/docs/changelog/. Investigated: spec 100%, docs 100%, sdk 100%.
- [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%.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (websites/plaid, 18142 snippets). Investigated: docs 100%, sdk 100%, cli 0%, mcp 0%, wellknown 0%.
- [warn] llms.txt present, valid & comprehensive — No llms.txt directive found in HTML of any of 50 sampled pages. Investigated: docs 75%.
- [warn] Docs reachable, not hard auth-gated — 50 JavaScript redirect(s) detected across 50 sampled pages. Investigated: docs 50%.
- [pass] Crawlable / AEO — Docs paths crawlable by all monitored AI agents. Investigated: wellknown 100%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — error codes documented in the docs site at https://plaid.com/docs/errors/. Investigated: docs 100%, spec 50%.
- [warn] Operation purpose clarity — 50% of operations are agent-inferable. Investigated: spec 67%.
- [warn] Agent-navigable, token-efficient docs — 14 of 50 pages have substantive content differences between markdown and HTML (avg 13% missing). Investigated: docs 65%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 2 surfaces (spec, docs) is 23% (threshold 35% for full credit).
- [warn] Docs structured data — OpenGraph/meta tags only across 19 assessed pages — no JSON-LD for answer engines to cite. Investigated: docs 50%.
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.

### Agent Usability

- [pass] Sandbox separation — sandbox documented in the docs site at https://plaid.com/docs/sandbox/. Investigated: spec 100%, docs 100%.
- [warn] Runnable collection with test scripts — No test scripts found in the workspace's collections. Investigated: platform 50%.
- [fail] Idempotency documented — 1% of mutating operations document idempotency. Investigated: spec 0%, docs 0%.
- [fail] Rate-limit signaling — No rate-limit response headers documented. Investigated: spec 0%, docs 0%.
- [skip] Pagination documented & consistent — No surface produced evidence for this capability in this run.

## Executive Summary

Plaid's API program stands out for its schema quality and documentation discoverability, which give partners and agents a strong structural foundation. However, two areas demand immediate attention: agents lack the machine-readable instruction context needed to navigate Plaid's APIs confidently, and critical operational reliability signals — idempotency documentation and rate-limit signaling — are missing, exposing partner integrations to silent failures and unpredictable behavior in production. Prioritizing these fixes will close the gap between Plaid's strong contract quality and the reliable, agent-ready experience partners expect.