{"name":"ERC-8004 Agent Liveness","description":"Checks whether an ERC-8004-registered agent is actually alive right now, not just registered once.","url":"https://erc8004-agent-liveness-325572559480.us-central1.run.app","version":"1.0.0","documentationUrl":"https://erc8004-agent-liveness-325572559480.us-central1.run.app/docs","provider":{"organization":"nexus-mcp-infra","url":"https://github.com/nexus-mcp-infra"},"capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"defaultInputModes":["application/json"],"defaultOutputModes":["application/json"],"additionalInterfaces":[{"url":"https://erc8004-agent-liveness-325572559480.us-central1.run.app/mcp","transport":"MCP"}],"skills":[{"id":"nexus_erc8004_agent_liveness_verify_registered_agent","name":"Verify Registered Agent Liveness","description":"Check whether an ERC-8004-registered agent is actually alive right now via a real MCP handshake against its declared endpoint.","tags":["erc-8004","agent-identity","liveness","trust","web3"]}],"metadata":{"protocol_note":"This service implements the Model Context Protocol (MCP) at /mcp, not A2A's own task methods. POST /verify-registered-agent is charged $0.10 via x402 (Base Sepolia TESTNET, not real funds); the MCP tool is currently free -- see README. Payment settles BEFORE this handler runs: a call is charged even on AGENT_NOT_FOUND or a 422. Checks the real ERC-8004 Identity Registry on Base Sepolia testnet -- no exclusive data access, the value is the real-time MCP liveness check a raw registry lookup can't give you."}}