Public APIs

Public APIs Categories API

Endpoints for category metadata.

Documentation GitHub OpenAPI

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/public-apis-categories-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.0.3
info:
  title: Public APIs Categories API
  description: 'A RESTful API for programmatically accessing the public-apis directory data. The API supports CORS and requires no authentication. All responses are served over HTTPS. Original source: davemachado/public-api.'
  version: '1.0'
  contact:
    name: Dave Machado
    url: https://github.com/davemachado/public-api
  license:
    name: MIT
    url: https://github.com/davemachado/public-api/blob/master/LICENSE
servers:
- url: https://api.publicapis.org
  description: Production
tags:
- name: Categories
  description: Endpoints for category metadata.
paths:
  /categories:
    get:
      summary: List categories
      description: List all categories used to organize entries.
      operationId: listCategories
      tags:
      - Categories
      responses:
        '200':
          description: List of categories
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string