{"name":"onyx_mcp_catalog_diff","tier":"free","price_usdc":"0","endpoint":"https://onyx-actions.onrender.com/v1/onyx_mcp_catalog_diff","method":"POST","input_schema":{"type":"object","properties":{"server_a":{"type":"string","description":"Base URL of the first MCP server (e.g. https://onyx-actions.onrender.com)."},"server_b":{"type":"string","description":"Base URL of the second MCP server."}},"required":["server_a","server_b"]},"description":"Side-by-side tool catalog diff between any two MCP servers. Fetches each server's /manifest (with /openapi.json fallback), normalizes the tool lists, and returns: only-in-A, only-in-B, same in both, price delta, schema delta. Free tier — useful for competitor analysis, regression detection, and migration planning.","when_to_use":"An MCP server operator wants to compare their catalog against a competitor (pricing power, missing tools), check for regression after a deploy, or plan a migration. One call, two URLs.","vs_alternatives":"Existing options: open two manifest pages in browser tabs and squint, or write your own diff script. No public tool. This is the first.","example_request":{"server_a":"https://onyx-actions.onrender.com","server_b":"https://oatp.cc"},"example_response":{"ok":true,"counts":{"in_a":47,"in_b":12,"in_both":5,"only_a":42,"only_b":7,"price_deltas":3,"schema_deltas":0,"fully_same":2},"only_in_a":["onyx_aml_screen","..."],"price_deltas":[{"name":"tool_x","a_price":0.05,"b_price":0.1,"delta":0.05}]},"settle_to":"0x3fD9ee1373562f894D322B37DFFAd7a5D2b2d78f","network":"base","facilitator":"https://facilitator.xpay.sh","payment_required":false,"free_introspection":true,"note":"GET this URL = free introspection card. POST with x402 payment header to call."}