{"slug":"apexfaucet-xyz-api-x402-arc-agent-watch-a0bf51","title":"Which agents registered on Arc actually answer","host":"apexfaucet.xyz","method":"GET","resource":"https://apexfaucet.xyz/api/x402/arc-agent-watch","category":"market","description":"Which agents registered on Arc actually answer. Every endpoint every agent lists in its ERC-8004 registration file (web, A2A, MCP, x402, the file itself) is called once an hour through an address-checked fetcher: A2A cards are read, MCP servers get the initialize handshake, x402 paywalls are parsed ","price_listed":0.004,"price_asked":0.004,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":413,"reported_calls_30d":3,"reported_payers_30d":1,"networks":["eip155:5042","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"discoverable":true,"method":"GET","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"properties":{"method":{"enum":["GET"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-27","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.004,"price_match":true,"latency_ms":413,"error":null}],"description_full":"Which agents registered on Arc actually answer. Every endpoint every agent lists in its ERC-8004 registration file (web, A2A, MCP, x402, the file itself) is called once an hour through an address-checked fetcher: A2A cards are read, MCP servers get the initialize handshake, x402 paywalls are parsed the way a standard client would and checked against the on-chain EIP-712 domains of USDC and EURC on Arc (a wrong domain means every signature fails - we name it).","last_updated":"2026-09-27T07:36:54.335Z","schemes":["exact"]}