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x402 Agent Wallet Tools – Permit/Permit2 Decoder
x402
x402 Agent Wallet Tools – Permit/Permit2 Decoder is a paid API for AI agents from x402-wallet.558686.xyz, paid per call via x402, $0.013/call, status unknown (last checked 2026-09-15).
Decodes and risk-analyzes EIP-712 typed data for Permit and Permit2 token approval signatures, extracting domain, spender, amount, and risk findings.
Price / call$0.013
Success—
StatusUnknown
How this service works
A buyer-side control console for signature risk, EIP-712 review, transaction decoding, ERC20 allowance risk, Permit/Permit2 approvals, transaction simulation summaries, spend guard policy, receipt gate enforcement, and private-key boundaries.
Output
Returns a JSON object with: the decoded domain fields, the permit family (e.g. Permit, Permit2, PermitSingle, PermitBatch), extracted structured fields (spender, amount, nonce, deadline), a list of risk findings (anomalies, suspicious spenders, excessive amounts), and an overall riskLevel classification. The result is deterministic for the same input.
Example use cases
Pre-signature permit safety review
“I'm about to sign a Permit2 approval on Base — the domain is 'Permit2' with chainId 8453, it's a PermitSingle for spender 0xAbCd...1234 and amount 5000000. Decode it and tell me the risk level before I proceed.”
DeFi agent approval gate
“My DeFi agent wants to sign a PermitSingle on chainId 1 with spender 0xDEAD...BEEF and amount 999999999999 — decode the EIP-712 typed data and flag any high-risk findings so I can decide whether to allow it.”
Debugging a failed permit transaction
“I have a Permit2 typed data payload with primaryType PermitBatch on chainId 8453 that's behaving unexpectedly — can you decode it and extract the domain, spender addresses, amounts, and tell me if anything looks off?”
Technical details
Endpoint
POSThttps://x402-wallet.558686.xyz/v1/tools/permit-permit2-decoderWhen to prefer
Use this endpoint when an AI agent or wallet needs to decode and risk-assess a Permit or Permit2 EIP-712 typed data payload before presenting it to a user for signing. It is the right choice when you need to extract human-readable fields (spender, amount, deadline) and a risk classification from a raw typed-data object, specifically for ERC20 token approval flows on EVM chains. Prefer this over generic EIP-712 decoders when you specifically need Permit/Permit2 family detection and risk findings.
Side effects
- Missing required domain.name or domain.chainId fields returns a validation error
- Missing message.spender or message.amount returns an input schema error
- Unrecognized primaryType may return empty family classification with limited findings
- Malformed EIP-712 typed data object returns a parse error
- Payment not included or insufficient returns HTTP 402
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "permit-permit2-decoder",
"input": {
"typedData": {
"domain": {
"name": "Permit2",
"chainId": 8453
},
"message": {
"amount": "1000000",
"spender": "0x4444444444444444444444444444444444444444"
},
"primaryType": "PermitSingle"
}
},
"route": "/v1/tools/permit-permit2-decoder",
"result": {
"domain": {},
"family": "family_example",
"findings": [],
"extracted": {},
"riskLevel": "riskLevel_example"
},
"project": "x402-agent-wallet-tools",
"deterministic": true
}
}Tags
x402
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