402Signal

Gold402 Verified. Hand-reviewed and on the curated list — curation is the bar. The stamp means a human read this entry and the endpoint answered when we knocked. It is not a delivery test: we have not paid this service and graded what came back, so treat it as "reachable and speaks the protocol," never as "this is worth the money."

Fail-closed live-endpoint x402 router. POST /route returns a currently-alive x402 URL or an honest miss. $0.01 USDC on Base, Solana, and Algorand. Example: POST {"need":"weather"}. ([OpenAPI](https://402signal.com/openapi.json)) ([MCP](https://402signal.com/mcp.json)) ([Manifest](https://402signal.com/.well-known/x402.json))