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touchstone.locomot.io – EIP-191 Signature Verification (ecrecover)
x402
touchstone.locomot.io – EIP-191 Signature Verification (ecrecover) is a paid API for AI agents from touchstone.locomot.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Recovers the Ethereum address that signed a message using ecrecover / EIP-191 personal_sign, optionally validating against an expected signer address.
Price / call$0.002
Success—
StatusUnknown
How this service works
Recover who signed a message (ecrecover, EIP-191 personal_sign). For EIP-712 typed data use POST /verify/sig. Every answer signed.
Output
Returns a JSON object containing the recovered signer Ethereum address, the message digest, the signature scheme (e.g. eip191), a boolean 'matches' field indicating whether the recovered signer equals the expected_signer (if provided), and the source/op metadata. The response itself is signed by the Touchstone service.
Example use cases
Verify Web3 login signature
“A user just logged in claiming to be wallet 0xDead...Beef. They signed the message 'Login to MyApp at 2024-01-15T10:30:00Z' and provided signature 0x9f3a...c821. Can you recover who actually signed that message and confirm it matches their claimed address?”
Audit DAO governance vote
“We have a governance proposal vote where the voter claims address 0x1234...abcd signed the message 'Vote YES on Proposal #42'. The signature is 0xe7b2...f904. Can you recover the actual signer and verify it matches the expected voter address?”
Validate NFT ownership claim
“Someone is claiming they own this NFT and signed the message 'I own CryptoPunk #7804' with signature 0xa1c5...3d78. Can you do an ecrecover on that and tell me which Ethereum wallet actually signed it?”
Technical details
Endpoint
GEThttps://touchstone.locomot.io/verify/sigWhen to prefer
Use this endpoint when you need to recover the signing Ethereum address from a standard EIP-191 personal_sign signature (the most common Web3 message signing format). If you are working with EIP-712 typed structured data, use the POST /verify/sig endpoint instead. Prefer this over rolling your own ecrecover logic when you want a deterministic, signed, auditable answer from a neutral third-party service.
Side effects
- Invalid or malformed signature hex returns an error (cannot ecrecover)
- Message format mismatch causes incorrect signer recovery
- Missing required 'signature' or 'message' query parameters returns a 400-level error
- Expected_signer address format is invalid (non-checksummed or malformed)
- Signature produced by a different scheme (e.g. EIP-712) will yield incorrect or unexpected signer — use POST /verify/sig for typed data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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