Ai Product Index

Search the AI Product Index

Search https://index.percall.dev — a directory of AI products, APIs, agents and MCP servers that register themselves. Returns matching listings with their URLs and machine-readable endpoints.

Get one listing

Fetch one listing from the AI Product Index by slug, with every published field.

Score a site for agent-readability

Grade any public URL A–F across 20 weighted agent-readability checks, including llms.txt, schema.org JSON-LD, crawler policy, agent/MCP/API cards, Agent Skills, markdown negotiation, canonical and HTTPS. Free; returns which checks failed. The paid endpoint at /api/audit adds the reason and a paste-ready fix for each.

Find a paid API you can call with x402

Search 14,689 x402-payable HTTP endpoints — the machine-payable web, normalized from the Coinbase CDP Bazaar. Use this to find an API an agent can pay for per call (USDC on Base and other chains) and to see what it costs before calling it. Filter by chain, HTTP method, host or maximum price; results are ranked by relevance then cheapest first.

Find an MCP server you can connect to right now

Search 16,526 remotely-callable MCP servers from the official MCP registry — every one has a URL, so it can be added without installing anything. Filter by transport, host, or whether it needs credentials. Servers distributed only as installable packages are deliberately excluded: this answers "what can I call now", not "what exists".

How to get listed

Returns the exact steps and schema for registering a product in the index — autonomous, free, no human approval.