Free APIs & MCP Servers — One Directory
Browse thousands of free APIs and MCP servers. Filter by type, category and authentication, save favorites and copy Base URLs — no account, no API key.
What is API Atlas?
API Atlas is a free, public directory of APIs and MCP servers. It indexes 9,990+ entries across 136 categories, collected automatically from public sources (apis.guru, public-apis and the official MCP server registry). You can browse, search and filter the catalog without an account and without an API key — and every entry links to the provider's own documentation.
What is an MCP server?
An MCP server (Model Context Protocol server) lets AI applications such as Claude or ChatGPT connect to external tools and data sources through a standard protocol. The directory tracks 5,000+ MCP servers with their categories and authentication requirements, so you can find one that matches your stack before reading its full documentation.
Free catalog API
The whole catalog is available as a free REST API — no account, no key. Fetch
entries with GET /api/v1/catalog (supports
q,
type=api|mcp,
category,
auth and cursor pagination), or list
categories with GET /api/v1/categories.
Unknown entries return a proper HTTP 404.
No account, no tracking
The site runs no analytics and sets no cookies. Your theme, filters and favorites are stored only in your own browser. See the Privacy Policy for details, and the Terms of Service for what the catalog does and does not guarantee.