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x402 Agent Wallet Tools – EVM Transaction Risk Decoder
x402
x402 Agent Wallet Tools – EVM Transaction Risk Decoder is a paid API for AI agents from x402-wallet.558686.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Decodes and risk-scores an EVM transaction (to, data, chainId, value) by detecting the called function, flagging dangerous patterns, and returning a structured risk assessment with findings.
Price / call$0.01
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: a decoded breakdown of the transaction (function name, parameters), a detectedFunction string, a list of risk findings (flagged issues like unlimited approvals, dangerous selectors, or Permit patterns), and an overall riskLevel string (e.g. low, medium, high). The result is deterministic for the same input.
Example use cases
Screen unlimited ERC20 approve before signing
“My agent is about to sign a transaction to contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum mainnet (chainId 1) with calldata 0x095ea7b3 and 0 ETH — decode it and flag whether this is an unlimited token approval that I should be worried about.”
Validate DeFi swap calldata on Base
“Can you decode this swap transaction calldata 0x38ed1739 going to 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D on Base (chainId 8453) with 0 ETH value and tell me what function it's calling and whether the risk level is safe?”
Audit Permit2 signature risk before agent execution
“I have a transaction targeting 0x000000000022D473030F116dDEE9F6B43aC78BA3 with calldata 0x2b67b570 on chainId 8453 and 0 ETH — run it through the risk decoder and tell me if it involves a Permit2 approval and what the overall risk findings are.”
Technical details
Endpoint
POSThttps://x402-wallet.558686.xyz/v1/tools/evm-transaction-risk-decoderWhen to prefer
Use this endpoint when an AI agent needs to programmatically screen raw EVM transaction calldata for safety before signing — especially for ERC20 approvals, Permit/Permit2 patterns, or unfamiliar contract interactions. Prefer this over generic ABI decoders when you need an opinionated risk level and findings list, not just a decoded struct. Ideal for autonomous agent wallets that must enforce a spend-guard or receipt-gate policy without human review.
Side effects
- Unknown or non-standard calldata selector returns empty decoded object with minimal findings
- Invalid Ethereum address in 'to' field causes a validation or parsing error
- Unsupported chainId may result in limited context for risk scoring
- Malformed hex in 'data' field returns an error or empty decode result
- Network or service errors return ok:false with no result body
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "evm-transaction-risk-decoder",
"input": {
"to": "0x1111111111111111111111111111111111111111",
"data": "0x095ea7b3",
"chainId": 8453,
"valueEth": "0"
},
"route": "/v1/tools/evm-transaction-risk-decoder",
"result": {
"decoded": {},
"findings": [],
"riskLevel": "riskLevel_example",
"detectedFunction": "detectedFunction_example"
},
"project": "x402-agent-wallet-tools",
"deterministic": true
}
}Tags
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