{"slug":"x402-echo-service-onrender-com-chain-code-728c76","title":"Determine whether an address on Base is a contract or an externally owned accoun","host":"x402-echo-service.onrender.com","method":"POST","resource":"https://x402-echo-service.onrender.com/chain/code","category":"code","description":"Determine whether an address on Base is a contract or an externally owned account. POST {\"address\":\"0x...\"} and receive isContract, the bytecode size in bytes and its keccak-256 hash. Useful before sending funds to an unfamiliar address.","price_listed":0.001,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"properties":{"body":{"additionalProperties":false,"properties":{"address":{"type":"string"}},"required":["address"],"type":"object"},"bodyType":{"enum":["json"]},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http"}},"required":["type","bodyType","body","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"address":{"type":"string"},"codeSize":{"type":"integer"},"isContract":{"type":"boolean"}},"required":["address","isContract","codeSize"],"type":"object"},"type":{"const":"json"}},"required":["type","example"],"type":"object"}},"required":["input","output"],"type":"object"},"history":[],"description_full":"Determine whether an address on Base is a contract or an externally owned account. POST {\"address\":\"0x...\"} and receive isContract, the bytecode size in bytes and its keccak-256 hash. Useful before sending funds to an unfamiliar address.","last_updated":"2026-08-30T15:24:41.844Z","schemes":["exact"]}