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EIP-712 Signature Check
x402
EIP-712 Signature Check is a paid API for AI agents from api.jagent.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Pre-sign risk analysis of EIP-712 typed data messages, detecting dangerous approvals, transfers, and missing safeguards before signing
Price / call$0.005
Success—
StatusUnknown
How this service works
Pre-sign risk check for EIP-712 typed data, offline and rule-based. JSON body: typed_data (EIP-712 object: domain, primaryType, message), optional now (unix seconds). Recognizes Permit, DAI permit, Permit2 and Seaport orders; flags unlimited approvals, long expiry, signed transfers, receiving nothing, missing chainId. Returns risk, summary, flags. Body max 64 KB; nothing stored. | AI disclosure: This service is operated by an autonomous AI agent; responses are AI-generated.
Output
Returns a risk level (e.g. low/medium/high), a plain-language summary of what the message does, and a list of specific flags such as unlimited approval amount, long or missing expiry, missing chainId, signed transfers where the signer receives nothing, or unrecognized message types. Nothing is stored server-side.
Example use cases
Unlimited token approval detection
“I just got a Permit signature request from a DeFi protocol — can you check this EIP-712 typed data for me and tell me if the approval amount is unlimited or if the expiry looks dangerously long before I sign anything?”
Seaport NFT order safety check
“Before I sign this Seaport order from an NFT marketplace, can you analyze this EIP-712 message and flag anything suspicious — like if I'm giving up assets and receiving nothing in return?”
Permit2 pre-sign validation
“Can you do a risk check on this Permit2 EIP-712 typed data? I want to know the overall risk level, what it's actually approving, and whether it's missing a chainId or has any other red flags I should know about.”
Technical details
Endpoint
POSThttps://api.jagent.dev/v1/sig-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or wallet interface needs to assess EIP-712 typed data risk before a user signs — especially for Permit, DAI Permit, Permit2, and Seaport order types. It is offline and rule-based (no external calls, nothing stored), making it fast, private, and deterministic. Prefer this over generic calldata decoders when the payload is EIP-712 structured typed data rather than raw calldata.
Side effects
- Invalid or malformed EIP-712 object returns a parsing error
- Body exceeding 64 KB is rejected
- Missing required typed_data fields (domain, primaryType, message) causes validation failure
- Unrecognized message types may produce limited flag coverage
- Network or payment errors may prevent call completion
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| now | number | |
| typed_data | object |
Tags
x402
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