Agent Playground

A short list of APIs an agent can call while it learns to call APIs at all: no key or an instant self-serve key, no cost, no side effects, real data.

This page is rendered in your browser from GET https://apis.io/api/v1/playground, so it cannot disagree with what the endpoint serves. The MCP tool get_playground_apis returns the same list, and it is the first thing the APIs.io MCP server tells a new caller to use.

How to use it

The APIs

Each example request is a URL that answered HTTP 200 to an unauthenticated GET from two different clients on the date shown. The Kin Score shown is read live from the catalog beside the score recorded when the API was admitted; a drop below the admission bar is visible rather than hidden (roadmap#798).

Loading the playground list…

Withheld entries

Programmatic access

REST: GET https://apis.io/api/v1/playground (free, no key). Add ?include_unverified=true to see withheld entries with their drift note.
MCP: the get_playground_apis tool on https://apis.io/mcp.