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Vextorium EVM Signature Verify
x402
Vextorium EVM Signature Verify is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).
Verifies an EVM wallet signature (EIP-191 personal_sign or EIP-712 typed data) and recovers the signer 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 whether the signature is valid (boolean), the recovered signer address, the signed hash, the detected signature type (e.g. 'EIP-191 personal_sign'), and the expected address for comparison.
Example use cases
Web3 login signature verification
“A user just tried to log in to my dapp using their MetaMask wallet — they signed the message 'Login to MyApp: nonce 4829' and sent signature 0xd3a1... — can you verify the signature and confirm the signer is 0xAbC456...?”
EIP-712 typed data signature check
“I need to validate an EIP-712 permit signature before processing an on-chain action — the signature is 0x9f2e... and I need to confirm it was signed by 0x1234abcd... using the permit typed data I'll provide.”
Audit trail signature authentication
“We received a signed attestation from a counterparty claiming their wallet 0xDEAD... signed the message 'Agreement v2 accepted' — the signature is 0x7b8c... — can you verify it's authentic and tell me the recovered signer address?”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/evm-signature-verify?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to cryptographically verify that a specific Ethereum wallet signed a given message or typed data payload — especially for Web3 authentication flows, on-chain agreement verification, or any scenario where you must recover the signer address from an EVM-compatible signature. Prefer this over manual cryptographic libraries when operating as an AI agent that needs a simple pay-per-call HTTP API without managing local crypto dependencies.
Side effects
- Invalid or malformed signature hex returns invalid result or error
- Missing required signature field causes request rejection
- Address mismatch between signer and expected_address returns valid=false
- Malformed EIP-712 data object causes parsing error
- Unsupported signature type may return null or error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | |
| message | string | |
| signature | string | |
| eip712_data | object |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "EIP-191 personal_sign",
"valid": true,
"signer": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf",
"signed_hash": "0x517cc9957090f83459004d4980c16e723e44524c30d84175324025d957b0451a",
"expected_address": "0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf"
}
}Tags
x402
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