{"slug":"underground-substratesymposium-com-api-merchant-key-f55fad10","name":"underground.substratesymposium.com/api/merchant-key","summary":"x402 conformance verification for wallet developers. Pay $1.00 USDC on Base or Solana; receive an Ed25519-signed attestation that your client completed a real 402→auth→settle→deliver cycle on production infrastructure. Includes @maraventano/map decoder source (src/read.js) inline for URL parsing in future transactions. Use in CI pipelines, before SDK releases, or as agent-to-agent trust anchor.","status":"live","indexable":true,"listed_since":"2026-10-25T17:54:03.448483Z","sources":[{"source":"x402_bazaar","external_id":"https://underground.substratesymposium.com/api/merchant-key","owner_address":"0xa3babb36564b0383a82c617050306ee30fd18e08","seen_at":"2026-10-27T21:43:43.674293Z","removed_at":null}],"endpoints":[{"url":"https://underground.substratesymposium.com/api/merchant-key","host":"underground.substratesymposium.com","protocol":"x402","state":"live","last_probe_at":"2026-10-27T03:07:32.978502Z","last_ok_at":"2026-10-27T03:07:32.978502Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"underground-substratesymposium-com-3a33f32d","name":"underground.substratesymposium.com"}],"payment_options":[{"endpoint_url":"https://underground.substratesymposium.com/api/merchant-key","network":"eip155:8453","scheme":"exact","rail":"exact","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","coin":"USDC","asset_label":"USD Coin","amount":"1000000","pay_to":"0xa3babb36564b0383a82c617050306ee30fd18e08","observed_at":"2026-10-27T03:07:32.978502Z"},{"endpoint_url":"https://underground.substratesymposium.com/api/merchant-key","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","scheme":"exact","rail":"exact","asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","coin":"USDC","asset_label":null,"amount":"1000000","pay_to":"5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN","observed_at":"2026-10-27T03:07:32.978502Z"}],"usage":{"source":"x402_bazaar","unique_payers_30d":1,"paid_calls_30d":1,"last_paid_at":"2026-10-09T21:59:44.700Z","reported_at":"2026-10-27T21:43:43.674293Z"},"assessment":{"method":"2026.10.2","checks":[{"id":"answers","state":"pass","reason":"Answered a check 21 hours ago."},{"id":"owner","state":"fail","reason":"No one has proven control of its domain or of the wallet it is paid at."},{"id":"track_record","state":"fail","reason":"Listed for 2 days; 30 are needed."},{"id":"real_customers","state":"fail","reason":"1 different wallets paid it in 30 days, as the x402 Bazaar reports (not yet counted by addrbook); 10 are needed."},{"id":"clean_scan","state":"not_applicable","reason":"Not an MCP server."}],"passed":1,"applicable":4,"contradicted":false,"computed_at":"2026-10-28T00:41:28.705833Z"},"identity":{"endpoint_domains":["substratesymposium.com"],"proven_domains":[],"proven_wallets":[],"namesakes":[],"namesake_count":0,"identity_checks":[],"wallet_attestations":[],"human_backings":[]},"replies":[],"customers":null,"scan":null,"notice":"Not affiliated with addrbook — claim or request removal."}