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EIP-712 Signature Risk Decoder (GET)
x402
EIP-712 Signature Risk Decoder (GET) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Inspects eth_signTypedData / EIP-712 payloads for security risks — spender fields, deadlines, unlimited allowances, nonces, chainId, verifyingContract — and returns risk flags and a wallet confirmation checklist without signing or sending anything.
Price / call$0.01
Success—
StatusDown
Output
A JSON object containing risk flags (e.g. unlimited allowance detected, deadline far in future, unknown spender, chainId mismatch, suspicious verifyingContract), a structured wallet confirmation checklist summarizing what the user is about to approve, and an overall risk assessment — all without producing a signature or calling any external chain RPC.
Example use cases
Example prompt
“Before I sign this EIP-712 message in my wallet, can you decode it and flag any risks — like unlimited allowances, suspicious spender addresses, or expired deadlines? Here's the typed data: {"types":{"Permit":[{"name":"owner","type":"address"},{"name":"spender","type":"address"},{"name":"value","type":"uint256"},{"name":"nonce","type":"uint256"},{"name":"deadline","type":"uint256"}]},"domain":{"name":"USD Coin","chainId":8453,"verifyingContract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA0291"},"message":{"owner":"0xabc...","spender":"0xdeadbeef...","value":"115792089237316195423570985008687907853269984665640564039457584007913129639935","nonce":0,"deadline":9999999999}}.”
Technical details
Endpoint
POSThttps://gpt55.558686.xyz/v1/tools/eip712-signature-risk-decoderWhen to prefer
Use this endpoint when a wallet, agent, or dApp needs a pre-signing safety check on an eth_signTypedData / EIP-712 payload — especially for ERC20 Permit, Permit2, transferWithAuthorization, or NFT operator approvals — without executing any transaction or connecting to a node. Prefer the GET variant when the client is a crawler, agent, or tool that handles query parameters more naturally than JSON request bodies.
Side effects
- Malformed or unparseable typed data JSON returns a validation error
- Missing required typed data input returns 400-level error
- Unrecognized EIP-712 type structure may result in incomplete risk analysis
- Chain ID not recognized may reduce quality of contract address context
- Known_addresses map not provided means spender labels will be absent
Tags
x402
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