Best Free APIs to Practice With

A developer-friendly payments API with clean documentation, libraries for every language, and instant webhooks.

The API for OpenAI's models, including GPT, embeddings, and image generation, with function calling support.

Cloud communications APIs for SMS, voice, video, and email that developers can wire into any app.

Custom mapping and location APIs with beautiful vector tiles, geocoding, routing, and navigation.

The official API for automating GitHub — repos, issues, PRs, releases, and actions — from your own scripts.

A desktop API client for designing, testing, and debugging REST and GraphQL APIs with a clean UI.

A community-curated GitHub repository listing thousands of free public APIs, organized by category.

An API marketplace where you discover, connect to, and manage thousands of third-party APIs in one place.

The open-source tool that turns OpenAPI specs into interactive, self-documenting API pages.

A lightweight, open-source API testing tool that runs entirely in the browser with a clean workspace.