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PayAI EIP-712 Signature Safety Screener
x402
PayAI EIP-712 Signature Safety Screener is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Pre-signs safety verdict for off-chain EIP-712 signatures (EIP-2612, Permit2, EIP-3009), decoding authorization details and returning allow/warn/block with a 0-100 risk score.
Price / call$0.02
Success—
StatusUnknown
How this service works
Pre-sign safety verdict for an off-chain EIP-712 signature (EIP-2612, Permit2, EIP-3009). Decodes what it authorizes (spender, token, amount, deadline), checks domain-spoof, approval-hygiene and scam-blocklist, returns allow, warn or block plus a 0-100 risk. Risk indicators, not advice.
Output
Returns a verdict of allow, warn, or block; a numeric risk score from 0 to 100; decoded authorization details including spender address, token, amount, and deadline; flags for domain spoofing, approval hygiene issues, and scam blocklist hits. These are risk indicators, not financial advice.
Example use cases
Wallet dApp permit safety check
“I'm about to sign an EIP-2612 permit on Ethereum for a dApp — here's the typed-data JSON. Can you decode what it authorizes and tell me if the spender looks legitimate or if this is a scam?”
DeFi protocol Permit2 audit
“Our DeFi protocol needs to screen every Permit2 signature our users are asked to sign on Arbitrum. Run this typed-data object through the safety screener and flag anything suspicious about the spender, amount or deadline.”
Recovered signer mismatch detection
“I have a signed Permit2 message and the raw 0x signature — can you check whether the recovered signer matches the expected address 0xAbCd...1234 and confirm this isn't a phishing attempt on Polygon?”
Technical details
Endpoint
POSThttps://payai.agentstools.dev/tx/signatureWhen to prefer
Choose this endpoint when you need a pre-signing safety check specifically for off-chain EIP-712 token-approval signatures (Permit2, EIP-2612, EIP-3009) on EVM chains. It is purpose-built for wallet agents and DeFi workflows that must screen authorization scope, deadline, spender legitimacy, and domain spoofing before a user signs — not for on-chain transaction simulation or general smart contract auditing.
Side effects
- Malformed or invalid EIP-712 typed-data object causes parsing failure
- Unsupported signature type (non-Permit2/EIP-2612/EIP-3009) may return incomplete decode
- Unknown or unlisted spender address yields a warn rather than definitive block
- Signature recovery fails if the provided 0x signature is invalid or truncated
- Network enum value outside supported chains (base, ethereum, arbitrum, optimism, polygon, bnb) rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| network | string | EVM network the signature is for (default base) |
| signature | string | Optional 0x signature to recover the signer |
| typed_data | object | Full EIP-712 typed-data object with domain, primaryType and message |
| expected_signer | string | Optional address to compare the recovered signer against |
Tags
x402
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