Free Public API Directory

saxi.ai is an open-source directory of 1,500+ free public APIs, organized for AI agents and developers. Every listing links to real documentation and is tagged by auth type, protocol, and capability (search, geocoding, browser automation, LLM, scraping, and more). Browse 68 categories, 16 capability types, and hand-picked collections like "Best APIs for AI Agents" or "Search and RAG APIs." The entire project is open source on GitHub. Submit new APIs, report broken listings, or contribute directly. Built on top of established open-source API lists (public-api-lists, public-apis) with validation and structured tagging on top. Free. No login. No API key. Just data.