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EVM Signature Verifier (EIP-191 / EIP-712 / ERC-1271)
x402
EVM Signature Verifier (EIP-191 / EIP-712 / ERC-1271) is a paid API for AI agents from onchain-health.mick8511.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-11-02).
Verifies whether a given signature was produced by a claimed EVM address, supporting EIP-191 personal_sign, EIP-712 typed data, raw 32-byte digests, and ERC-1271 smart-contract wallets across five EVM chains.
Price / call$0.002
Success—
StatusUnknown
How this service works
Checks whether a signature was made by a claimed EVM address: EIP-191 personal_sign messages, EIP-712 typed data or a raw 32-byte digest, verified by ecrecover for wallets or ERC-1271 isValidSignature for smart-contract wallets (Safe, Coinbase Smart Wallet) on Ethereum, Base, Arbitrum, Optimism or Polygon. Returns validity, method, recovered signer and digest. Free sample: https://onchain-health.mick8511.workers.dev/sample
Output
Returns a JSON object containing: a boolean validity flag indicating whether the signature is authentic, the verification method used (ecrecover or ERC-1271 isValidSignature), the recovered or confirmed signer address, and the computed message digest.
Example use cases
Gating access behind wallet signature
“A user claims they own 0x1234...abcd and submitted a personal_sign of 'Login to MyDapp at 1710000000' with signature 0xaabbcc... — can you verify that signature on Ethereum and confirm whether it's valid before I let them in?”
Validating EIP-712 typed order signature
“I have an EIP-712 typed data object for a trade order, supposedly signed by 0xDeAdBeEf... with signature 0x112233... on Arbitrum — please verify whether that address actually signed it.”
Checking Safe multisig wallet signature
“Our Safe smart-contract wallet at 0xSafe...9999 on Base should have signed a governance proposal using ERC-1271 — the signature is 0xfeedface... and the message digest is 0xabc123... Can you confirm it's valid?”
Technical details
Endpoint
POSThttps://onchain-health.mick8511.workers.dev/verify-signature?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to cryptographically verify that an EVM wallet (EOA or smart-contract wallet like Safe or Coinbase Smart Wallet) produced a given signature, especially when you need multi-chain support (Ethereum, Base, Arbitrum, Optimism, Polygon) and ERC-1271 smart-contract wallet support in a single call. Prefer it over rolling your own ecrecover when smart-contract wallets may be involved, or when you need to handle EIP-191 and EIP-712 formats without custom parsing logic.
Side effects
- Invalid or malformed signature hex returns an error or validity=false
- Mismatched address and signer returns validity=false with recovered signer shown
- ERC-1271 check fails if the contract is not deployed or does not implement isValidSignature
- Unsupported chain identifier causes an error response
- Providing neither message, typed_data, nor hash results in a missing-input error
- RPC node timeout for ERC-1271 on-chain call may return a transient error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hash | string | 32-byte digest |
| chain | string | Chain for ERC-1271 checks (default ethereum) |
| address | string | Claimed signer |
| message | string | EIP-191 message text (or use typed_data / hash) |
| signature | string | 0x hex signature |
| typed_data | object | EIP-712 typed data {types, primaryType, domain, message} |
Tags
x402
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