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EIP-191 / EIP-712 Signature Verifier & Signer Recovery
x402
EIP-191 / EIP-712 Signature Verifier & Signer Recovery is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Verifies an Ethereum EIP-191 personal_sign or EIP-712 typed-data signature and recovers the signer's address from a message and signature pair.
Price / call$0.003
Success—
StatusUnknown
How this service works
Verify an EIP-191 personal_sign or EIP-712 typed-data signature and recover the signer address from public inputs (message + signature). Verification/recovery only — never signs.
Output
Returns the recovered Ethereum address derived from the message and signature, a boolean indicating whether the signature is valid, and optionally whether the recovered address matches the provided expected_signer address.
Example use cases
Wallet-based login verification
“A user is trying to log in by signing the message 'Login to MyApp at 1700000000' using personal_sign. Their claimed address is 0xAbCd...1234 and their signature is 0x5f3e...ab12. Can you verify the EIP-191 signature and confirm it matches that address?”
EIP-712 typed-data permit validation
“I have an EIP-712 typed-data signature for a token permit — the typed-data includes the domain, types, primaryType, and message fields. The signature is 0xf1a2...cc99. Can you recover the signer address from this typed-data signature and tell me who signed it?”
Off-chain governance vote authentication
“We received a governance vote from someone claiming to be 0x9988...5566. They signed the message 'Vote YES on Proposal #42' using personal_sign and provided signature 0xd3e1...7700. Please verify the EIP-191 signature and confirm it actually came from that address.”
Technical details
Endpoint
POSThttps://api.agentstools.dev/crypto/verifyWhen to prefer
Choose this endpoint when you need to cryptographically verify an Ethereum wallet signature (either EIP-191 personal_sign or EIP-712 typed-data) and recover the signing address without any signing capability — ideal for authentication flows, off-chain governance, permit validation, or any scenario where a user proves ownership of a wallet by signing a message.
Side effects
- Invalid or malformed 0x signature (not 65 bytes) returns an error
- Mismatched scheme — passing EIP-712 typed-data with eip191 scheme or vice versa causes recovery failure
- Malformed typed-data object (missing types/domain/primaryType/message) for EIP-712 returns a parse error
- Non-hex or improperly encoded message may cause decoding errors
- Expected_signer address mismatch returns valid recovery result but a negative match flag
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| scheme | string | eip191 personal_sign or eip712 typed-data |
| message | — | Plain text / 0x-hex (eip191) OR a full typed-data object with types/domain/primaryType/message (eip712) |
| signature | string | 0x 65-byte signature |
| expected_signer | string | Optional address to compare the recovered signer against |
Tags
x402
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