{"protocolVersion":"0.3.0","name":"obolpay-x402-gateway","description":"Deterministic service agent for this x402 paid-data gateway. Offers FREE discovery, preview, balance lookup and receipt verification only — it is not a conversational AI. PURCHASE happens exclusively via the x402 HTTP 402 flow at https://x402.obolpay.xyz/api/v1/protected-data, never through A2A.","url":"https://x402.obolpay.xyz/a2a","version":"0.5.0","preferredTransport":"JSONRPC","capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"defaultInputModes":["text/plain","application/json"],"defaultOutputModes":["application/json","text/plain"],"skills":[{"id":"discover","name":"Catalog discovery (free)","description":"Return this x402 gateway's machine-readable manifest: price, token, network, recipient, payment flow, capabilities. Same document as GET /.well-known/x402. No payment required. Purchase happens exclusively OUT-OF-BAND via the x402 HTTP 402 flow at https://x402.obolpay.xyz/api/v1/protected-data — never through A2A messages.","tags":["free","keyless","discovery","x402"]},{"id":"preview","name":"Free preview of the paid dataset","description":"Free preview of the paid dataset so you can evaluate BEFORE paying (trustless). Optionally pass a data part {\"skill\":\"preview\",\"args\":{\"types\":[\"…\"]}} to scope the preview to the categories you would actually buy. No invoice is created. Purchase happens exclusively OUT-OF-BAND via the x402 HTTP 402 flow at https://x402.obolpay.xyz/api/v1/protected-data — never through A2A messages.","tags":["free","keyless","preview","x402"]},{"id":"balance","name":"Prepaid balance lookup (free)","description":"Look up a prepaid gasless balance for an address passed as {\"skill\":\"balance\",\"args\":{\"address\":\"0x…\"}}: balance_units, calls_remaining, next_nonce and the voucher message to sign. Read-only; signing happens on YOUR side with YOUR key — this server never asks for a private key. Purchase happens exclusively OUT-OF-BAND via the x402 HTTP 402 flow at https://x402.obolpay.xyz/api/v1/protected-data — never through A2A messages.","tags":["free","keyless","prepaid","x402"]},{"id":"verify_receipt","name":"Verify a proof-of-purchase receipt (free)","description":"Verify a signed purchase receipt issued by this gateway, passed as {\"skill\":\"verify_receipt\",\"args\":{\"message\":\"…\",\"signature\":\"0x…\"}}: recovers the EIP-191 signer and checks it equals the server's receipt signer. Anyone can verify — no payment required. Purchase happens exclusively OUT-OF-BAND via the x402 HTTP 402 flow at https://x402.obolpay.xyz/api/v1/protected-data — never through A2A messages.","tags":["free","keyless","receipt","verification","x402"]}]}