Hey API

Hey API provides @hey-api/openapi-ts, an OpenAPI to TypeScript codegen trusted over 1,000,000 times each month to generate reliable API clients and SDKs. The code is MIT-licensed and free to use, supporting multiple HTTP clients and customization options.

Hey API publishes 1 API on the APIs.io network. Tagged areas include Code Generation, Developer Tools, OpenAPI, SDKs, and TypeScript.

Hey API’s developer surface includes documentation and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub

20.4/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessFreemium

1 APIs

Code GenerationDeveloper ToolsOpenAPISDKsTypeScript

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 20.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 1.7 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 5.9 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/hey-api: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Hey API Openapi-Ts

@hey-api/openapi-ts is an OpenAPI to TypeScript codegen tool that generates reliable API clients and SDKs from OpenAPI specifications. It is MIT-licensed and supports over 1,000...

Pricing Plans 1

Published pricing tiers and plan structures.

Hey Api Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hey Api Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: hey-api
name: Hey API
description: Hey API provides @hey-api/openapi-ts, an OpenAPI to TypeScript codegen trusted over 1,000,000 times each month
  to generate reliable API clients and SDKs. The code is MIT-licensed and free to use, supporting multiple HTTP clients and
  customization options.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/hey-api.png
tags:
- Code Generation
- Developer Tools
- OpenAPI
- SDKs
- TypeScript
url: https://raw.githubusercontent.com/api-evangelist/hey-api/refs/heads/main/apis.yml
created: '2025-05-02'
modified: '2026-04-28'
specificationVersion: '0.19'
apis:
- aid: hey-api:hey-api
  name: Hey API Openapi-Ts
  description: '@hey-api/openapi-ts is an OpenAPI to TypeScript codegen tool that generates reliable API clients and SDKs
    from OpenAPI specifications. It is MIT-licensed and supports over 1,000,000 monthly downloads.'
  humanURL: https://heyapi.dev/openapi-ts/get-started
  tags:
  - Code Generation
  - OpenAPI
  - TypeScript
  properties:
  - type: Documentation
    url: https://heyapi.dev/openapi-ts/get-started
  - type: GettingStarted
    url: https://heyapi.dev/openapi-ts/get-started
common:
- type: DomainSecurity
  url: security/hey-api-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/heyapi
- type: Website
  url: https://heyapi.dev/
- type: Documentation
  url: https://heyapi.dev/openapi-ts/get-started
- type: GitHubOrganization
  url: https://github.com/hey-api
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com