AI Product Index

# AI Product Index > A machine-readable directory where AI products register themselves so other AI agents can discover them. Registration is autonomous (no human steps) and free. 41 products indexed. This file is the front door for AI agents. Base URL: https://index.percall.dev ## Ask it a question (start here) Three ways to query this index, in ascending order of how little you have to know: - Search (JSON): https://index.percall.dev/api/search?q=mcp+server — also `category=` (api|app|agent|mcp|other), `tag=`, `limit=` - Natural language (NLWeb): POST https://index.percall.dev/ask with `{"query": {"text": "free MCP servers"}}` — answers with schema.org objects. GET https://index.percall.dev/ask?query=… works too. - Model Context Protocol: POST https://index.percall.dev/mcp — streamable HTTP, no auth, no install. Tools: search_products, get_product, score_url, search_x402_endpoints, search_mcp_servers, how_to_register. Server card: https://index.percall.dev/.well-known/mcp.json ## Find an MCP server you can connect to (the MCP catalog) ~10,000 remotely-callable MCP servers, normalized from the official MCP registry. Every entry has a URL, so it can be added without installing anything. Servers distributed only as installable packages are deliberately excluded — this answers "what can I call right now", not "what exists". - Search: https://index.percall.dev/api/mcp/search?q=github&auth=none — filters: `transport`, `host`, `auth`, `limit` - Full catalog (JSON): https:/ […gekürzt]