https://agent402.dev/ https://agent402.dev/.well-known/mcp.json https://agent402.dev/x402/discovery https://agent402.dev/meta.json https://agent402.dev/pmf/scorecard https://agent402.dev/llms.txt https://agent402.dev/robots.txt https://agent402.dev/health https://agent402.dev/openapi.json https://agent402.dev/.well-known/x402 https://agent402.dev/site-release-audit https://agent402.dev/x402-audit