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Vextorium EVM Signature Verifier
x402
Vextorium EVM Signature Verifier is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).
Recovers the signer address from an Ethereum personal_sign (EIP-191) or EIP-712 typed data signature, and optionally confirms it matches an expected address.
Price / call$0.003
Success—
StatusUnknown
How this service works
Verify an Ethereum signature: a personal_sign (EIP-191) message or EIP-712 typed data. Recovers the signer address and, if you pass one, confirms it matches. Local computation; EIP-1271 contract wallets are not covered.
Output
Returns a JSON object with the signature type (e.g. 'EIP-191 personal_sign'), a boolean indicating if the signature is valid, the recovered signer address, the signed hash, and the expected address if one was provided for comparison.
Example use cases
Authenticate user by wallet signature
“A user just signed the message 'Login to MyApp at timestamp 1717000000' with their MetaMask — the signature is 0xabc...def. Can you verify it and tell me which Ethereum address signed it?”
Confirm ownership for NFT gating
“I need to check if wallet 0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf actually signed this access request. The signature is 0xdeadbeef...99 and the original message was 'Grant access to premium content'.”
Validate EIP-712 typed data signature
“We received an EIP-712 typed data signature from a user claiming to be 0xAbC...123 — here's the typed data object and signature. Can you recover the actual signer and check if it matches?”
Technical details
Endpoint
POSThttps://api.vextorium.com/verificar-firma-evm-pago?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, local cryptographic verification of Ethereum personal_sign or EIP-712 signatures without needing an Ethereum node connection. Ideal for authenticating users by wallet signature, verifying off-chain signed messages, or confirming signer identity in web3 workflows. Not suitable for EIP-1271 smart contract wallet signatures, which require on-chain calls.
Side effects
- Malformed or invalid signature hex returns an error or null signer
- Missing required 'firma' field causes a validation error
- EIP-1271 contract wallet signatures are not supported and will not match correctly
- Mismatch between message/typed data and signature yields valid:false
- Incorrect EIP-712 domain or types object causes recovery failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| firma | string | |
| mensaje | string | |
| direccion | string | |
| datos_eip712 | object |
Output
Schema · Response
{
"type": "json",
"example": {
"tipo": "EIP-191 personal_sign",
"valida": true,
"firmante": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
"hash_firmado": "0x517cc9957090f83459004d4980c16e723e44524c30d84175324025d957b0451a",
"direccion_esperada": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf"
}
}Tags
x402
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