{"slug":"api-vextorium-com-v1-eip712-review-e12500","title":"Explain an EIP-712 typed-data signature before signing it","host":"api.vextorium.com","method":"POST","resource":"https://api.vextorium.com/v1/eip712-review","category":"market","description":"Explain an EIP-712 typed-data signature before signing it: x402/EIP-3009 payment authorizations, EIP-2612 permits, Permit2 and Seaport orders. Flags unlimited allowances, long validity and non-official tokens, and returns the exact hash to compare with your wallet.","price_listed":0.005,"price_asked":0.005,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":315,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:10","eip155:5042","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"signature_data":{"domain":{"chainId":8453,"name":"USD Coin","verifyingContract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","version":"2"},"message":{"from":"0x1111111111111111111111111111111111111111","nonce":"0xabababababababababababababababababababababababababababababababab","to":"0x2222222222222222222222222222222222222222","validAfter":"1790634093","validBefore":"1790634453","value":"10000"},"primaryType":"TransferWithAuthorization","types":{"TransferWithAuthorization":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"value","type":"uint256"},{"name":"validAfter","type":"uint256"},{"name":"validBefore","type":"uint256"},{"name":"nonce","type":"bytes32"}]}}},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"signature_data":{"description":"EIP-712 object as passed to eth_signTypedData_v4: domain, types, primaryType, message","type":"object"}},"required":["signature_data"]},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"alerts":{"items":{},"type":["array","null"]},"application":{"type":["string","null"]},"domain_separator":{"type":["string","null"]},"hash_to_sign":{"type":["string","null"]},"message_hash":{"type":["string","null"]},"network":{"type":["string","null"]},"note":{"type":["string","null"]},"summary":{"properties":{"action":{"type":["string","null"]},"amount":{"type":["string","null"]},"for":{"type":["string","null"]},"since":{"type":["string","null"]},"token":{"type":["string","null"]},"valid_since":{"type":["string","null"]},"valid_until":{"type":["string","null"]}},"type":["object","null"]},"type":{"type":["string","null"]},"verdict":{"type":["string","null"]},"verifier_contract":{"type":["string","null"]}},"type":["object","null"]},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-04","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.005,"price_match":true,"latency_ms":315,"error":null}],"description_full":"Explain an EIP-712 typed-data signature before signing it: x402/EIP-3009 payment authorizations, EIP-2612 permits, Permit2 and Seaport orders. Flags unlimited allowances, long validity and non-official tokens, and returns the exact hash to compare with your wallet.","last_updated":"2026-10-03T20:33:32.976Z","schemes":["exact"]}