# Hey API

**Canonical:** https://apis.io/providers/hey-api/  
**Website:** https://heyapi.dev/  
**APIs profiled:** 7

Hey API builds open-source OpenAPI code generators and a hosted specification registry. @hey-api/openapi-ts turns an OpenAPI document into production-grade TypeScript — SDKs, types, Zod/Valibot/TypeBox validators, TanStack Query and SWR hooks, MSW and Playwright test doubles, and Fastify/NestJS/Hono/Express server handlers — across more than twenty plugins and eight HTTP client runtimes, with a sibling Python generator emitting Pydantic models. It draws over four million npm downloads a week and is used by Vercel, PayPal, AWS, Autodesk and OpenCode. The Hey API Platform (api.heyapi.dev) adds a build-attested registry: CI uploads each OpenAPI document with its repository, branch, commit and workflow provenance, and consumers resolve it back by branch, tag, version or exact commit for reproducible client generation.

## Kin Score — 45.7 / 100 (developing)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 45.7).

| Facet | Score |
|---|---|
| Discoverability | 72.2 |
| Contract Quality | 48.9 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 42.1 |
| Developer Ergonomics | 78.0 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## Agent readiness — 34.7 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | yes |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (7)

- **Hey API Openapi-Ts** — @hey-api/openapi-ts is an OpenAPI to TypeScript code generator that emits production-grade SDKs, types, validators, query hooks, mocks and web framework handlers from any OpenAP...
- **Hey API Get API** — The Get API from Hey API — 1 operation(s) for get.
- **Hey API Hey API API** — The Hey API API from Hey API — 1 operation(s) for hey api.
- **Hey API Internal API** — The Internal API from Hey API — 3 operation(s) for internal.
- **Hey API Organizations API** — The Organizations API from Hey API — 13 operation(s) for organizations.
- **Hey API Specifications API** — The Specifications API from Hey API — 1 operation(s) for specifications.
- **Hey API Users API** — The Users API from Hey API — 6 operation(s) for users.

## Agentic access (1)

- **Hey Api Agentic Access** — 38 operations · 23 acting

## Security (2)

- **Hey Api Authentication** — http · 2 schemes
- **Hey Api Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Hey Api Plans Pricing**

## Tags

Code Generation, Developer Tools, OpenAPI, SDK, TypeScript, Python, API Design, Specifications, Registry, Open-Source

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/hey-api/). Scores are computed from the provider's own public artifacts under a published rubric.