Use 402Signal from an agent
Send the capability you need. Pay $0.01 USDC for the live routing check. Get a route with evidence, or a typed miss.
Send POST /route with the capability your agent needs. The unpaid request returns an x402 payment challenge. Sign a matching $0.01 USDC option and retry the request.
curl -sS -D - https://402signal.com/route -H 'Content-Type: application/json' -d '{"need":"YOUR_NEED"}'
A paid check returns HTTP 200 with a route and evidence (live, url, invocable, target), or HTTP 503 with a typed miss_reason.
MCP endpoint: https://402signal.com/mcp. Tools: route (paid live check) and preview (free catalog search).
https://402signal.com/mcp
Point your MCP client at that URL. Call route with need when you want a request-time check. An unpaid route call returns HTTP 402; retry with a matching $0.01 USDC signature.