Most sites have no MCP server, no WebMCP, no OpenAPI — just an internal REST API their own app calls. API Capture observes that traffic and synthesizes an OpenAPI spec + tools an AI agent can actually run. The third connection type, alongside MCP and WebMCP.
The QuickCatch extension (opt-in, per-site) records a page's fetch/XHR calls — or POST them yourself.
We collapse id-like paths into params, infer request/response schemas, and emit a clean OpenAPI 3 spec.
Each operation becomes a tool an agent can call — wmcp runs the real upstream request.
Paste observed HTTP exchanges (or use the prefilled sample) and synthesize tools in your browser.
Tools appear here…
One click on any site — opt-in, current-tab only, auth fields redacted. Get QuickCatch.
POST your captured exchanges directly:
curl -X POST https://wmcp.sh/api/v1/flows \
-H "content-type: application/json" \
-d '{"flows":[{"method":"GET","url":"…"}]}'Synthesis is free (read tier). Executing the captured tools against the real API is the paid tier — get a key.