{"slug":"x402-agentindex-world-x402-echo-eb1b6f","title":"Cheapest possible Base-mainnet x402 conformance call","host":"x402.agentindex.world","method":"GET","resource":"https://x402.agentindex.world/x402-echo","category":"other","description":"Cheapest possible Base-mainnet x402 conformance call: settle exactly one atomic unit of USDC ($0.000001) and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.","price_listed":0.001,"price_asked":0.001,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":946,"reported_calls_30d":0,"reported_payers_30d":0,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"message":"hello agent"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"properties":{"message":{"description":"Optional test message to echo after successful settlement.","type":"string"}},"required":[],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"network":{"type":"string"},"ok":{"type":"boolean"},"payer":{"type":["string","null"]},"price_atomic_usdc":{"type":"string"},"price_usdc":{"type":"number"},"purpose":{"type":"string"},"request":{"type":"object"},"x402_receipt":{"type":"object"}},"required":["ok","purpose","network","price_usdc","price_atomic_usdc","request"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-25","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.001,"price_match":true,"latency_ms":946,"error":null}],"description_full":"Cheapest possible Base-mainnet x402 conformance call: settle exactly one atomic unit of USDC ($0.000001) and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.","last_updated":"2026-09-25T17:02:06.91Z","schemes":["exact"]}