# Square — API Agent Score

> Score: 67/100 (Grade: C) | Domain: squareup.com | Rubric: 1.0.0 | Checked: July 24, 2026

Square scored 67/100 (C), classified "partially-ready".

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

## Summary

- Overall: 67/100 (C)
- Classification: partially-ready

## Category Scores

- API Design: 71/100 (B)
- Developer Experience: 88/100 (A)
- Agent Discovery: 76/100 (B)
- Agent Understanding: 47/100 (F)
- Agent Usability: 68/100 (C)

## Check Results

### API Design

- [warn] Schema coverage & depth — 4946/5494 (90%) public params are fully typed (no any/**kwargs). Analyzer reports not all methods have a derivable input schema. Investigated: sdk 90%.
- [pass] Example coverage — Code samples present on 1/1 pages across 1 language(s); broader multi-language coverage missing. Investigated: docs 100%, sdk 100%.
- [fail] Security & governance hygiene — No security.txt at /.well-known/security.txt or /security.txt. Investigated: wellknown 0%.
- [skip] Machine-readable, versioned contract — No surface produced evidence for this capability in this run.
- [skip] Auth declared & discoverable — No surface produced evidence for this capability in this run.

### Developer Experience

- [pass] Self-service developer portal — Signup page at https://squareup.com/us/en/point-of-sale; no free-tier language detected in docs/pricing. Investigated: docs 100%.
- [pass] Code samples in docs — Code samples present on 1/1 pages across 1 language(s); broader multi-language coverage missing. Investigated: docs 100%.
- [warn] Description completeness — 1795/2017 operations carry a description. Investigated: sdk 89%.
- [pass] Changelog published — Newest official SDK activity 9 day(s) ago. Investigated: sdk 100%.
- [warn] Quickstart present — Quickstart page reachable (1 variants scanned starting at https://squareup.com/us/en) but no runnable code sample detected in HTML or .md variant. Investigated: docs 50%.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (websites/developer_squareup, 11441 snippets). Investigated: docs 100%, sdk 58%, cli 0%, mcp 0%, wellknown 0%.
- [warn] Docs reachable, not hard auth-gated — Server ignores Accept: text/markdown header (0/50 sampled pages return markdown); 37 rate-limited (HTTP 429). Investigated: docs 75%.
- [warn] llms.txt present, valid & comprehensive — No llms.txt directive found in HTML of any of 26 sampled pages; 24 failed to fetch. Investigated: docs 38%, sdk 0%.
- [warn] Crawlable / AEO — Sitemap present (1 entries) but carries no lastmod values. Investigated: wellknown 75%.

### Agent Understanding

- [warn] Agent-navigable, token-efficient docs — No sampled pages support .md URLs (0/50 tested). Investigated: docs 50%.
- [warn] Docs structured data — OpenGraph/meta tags only across 1 assessed pages — no JSON-LD for answer engines to cite. Investigated: docs 50%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 2 surfaces (docs, sdk) is 11% (threshold 35% for full credit).
- [fail] Machine-readable errors (RFC 9457) — No single common SDK base error class was found; errors do not share one root. Investigated: sdk 0%.
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.
- [skip] Operation purpose clarity — No surface produced evidence for this capability in this run.

### Agent Usability

- [pass] Idempotency documented — Built-in retry machinery is present (grep-derived). Investigated: sdk 100%.
- [pass] Sandbox separation — Sandbox environments are exposed (sandbox). Investigated: sdk 100%.
- [fail] Pagination documented & consistent — None of the 249 measured list method(s) return an auto-paginating iterable. Investigated: sdk 0%.
- [fail] Runnable collection with test scripts — No public Postman workspace discovered for the org. Investigated: platform 0%.
- [skip] Rate-limit signaling — No surface produced evidence for this capability in this run.

## Executive Summary

Square's API program shows genuine strengths in developer onboarding and schema quality, giving partners a solid foundation to build against. However, the program has critical gaps in two areas that directly limit partner and agent success: agents cannot reliably interpret errors or discover how to work with the API autonomously, and partners lack runnable, verifiable examples that prove real-world workflows. Prioritizing machine-readable error contracts, agent-facing context files, and a runnable collection with test coverage will unlock self-serve partner integration and make the API program AI-agent ready.