{"protocolVersion":"1.0","name":"Agent Contract Proof","description":"Verify that a public agent or API endpoint matches its advertised payment and schema contract.","author":"Skowron Works","wellKnownURI":"https://agent-contract-proof.mattskowronis.workers.dev/.well-known/agent-card.json","url":"https://agent-contract-proof.mattskowronis.workers.dev/a2a","version":"1.0.0","provider":{"organization":"Skowron Works","url":"https://skowronworks.com/agent-tools/agent-contract-proof/"},"documentationUrl":"https://skowronworks.com/agent-tools/agent-contract-proof/","iconUrl":null,"supportsAuthenticatedExtendedCard":null,"security":[{"x402":[]}],"securitySchemes":{"x402":{"in":"header","name":"PAYMENT-SIGNATURE","type":"apiKey","description":"x402 exact scheme, $0.01 USDC on eip155:8453"}},"capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false,"extensions":null},"defaultInputModes":["application/json"],"defaultOutputModes":["application/json"],"skills":[{"id":"verify_agent_contract","name":"Verify Agent Contract","description":"Compare an agent's advertised contract with its live x402 challenge and return deterministic proof.","tags":["x402","agent-contract","payment-proof","schema-verification","dependency-monitoring"],"examples":["Check whether this agent still charges one cent to the advertised wallet.","Compare the current contract hash with the hash saved on the last successful run.","Verify the advertised route, method, price, network, wallet, asset, and schemas before paying."],"inputModes":[],"outputModes":[]}],"conformance":true,"conformance_errors":null,"homepage":null,"repository":null,"license":null,"pricing":null,"contact":null,"id":"78a92f45-ee64-4ba9-9847-1509e32aa89e","created_at":"2026-08-30T17:01:54.350999Z","updated_at":"2026-10-13T02:17:19.258002Z","hidden":false,"flag_count":0,"maintainer_notes":"Agent card is valid but the A2A endpoint returns **404 Not Found** when sending messages. The `message/send` endpoint does not exist at the URL declared in the agent card.","category":"trust-safety","category_secondary":null,"uptime_percentage":100.0,"avg_response_time_ms":1137,"last_health_check":"2026-10-13T02:17:19.151078Z","is_healthy":true,"status_notes":[],"task_conformance":{"category":"404","passed":false,"checked_at":"2026-10-12T06:34:55.156284Z","response_ms":907}}