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SignCheck Lite by AgentGate
x402
SignCheck Lite by AgentGate is a paid API for AI agents from api.youraitools.co, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-23).
Offline (no RPC) pre-sign safety check that decodes transactions, EIP-712 typed data, and x402 payment payloads, returning a SAFE/CAUTION/DANGER verdict with risk flags and OFAC SDN screening.
Price / call$0.005
Success—
StatusUnknown
How this service works
Offline transaction and signature safety check API for crypto wallets. Offline pre-sign check (no RPC, fast): decodes a transaction, EIP-712 typed data (Permit, Permit2, EIP-3009), an EIP-7702 authorization or an x402 402 + payment payload and returns SAFE/CAUTION/DANGER, every risk flag with its reason, decoded args, counterparties, x402 payment-vs-402 match and OFAC SDN screening. Use /v1/check for on-chain facts and simulation.
Output
A JSON object containing: a verdict tier (SAFE/CAUTION/DANGER), an array of risk flags each with a code, human-readable message, and severity level, a numeric risk score, the decoded action type (e.g. erc20_approve), identified counterparties with their roles and addresses, OFAC SDN screening results with match count and list date, decoded token metadata, and a plain-English summary of what the transaction does.
Example use cases
Screen DeFi approval before signing
“I'm about to sign a USDC approve transaction on Base — calldata is 0x095ea7b3000000000000000000000000abc123... going to 0xdef456... Can you do an offline safety check on it and tell me if the spender is a contract or a wallet, and if the allowance is unlimited?”
OFAC sanctions check on counterparty
“Check this raw Ethereum transaction for OFAC SDN matches — the to-address is 0x7F367cC41522cE07553e823bf3be79A889debe1B and data is 0xa9059cbb... Is any counterparty on the sanctions list?”
Validate x402 payment payload safety
“I have an x402 payment payload I need to verify before authorizing — can you decode it and check whether the payment details match the 402 response, and flag any risks? The chain is Base and the payload hex is 0x1234abcd...”
Technical details
Endpoint
GEThttps://api.youraitools.co/signcheck/v1/lite?utm_source=zero.xyzWhen to prefer
Use SignCheck Lite when you need a fast, offline pre-sign risk assessment with no RPC dependency — ideal for agent wallets that must screen transactions before signing without incurring latency from on-chain calls. Prefer this over /v1/check when speed matters more than live on-chain state, or when you want OFAC screening and decoded risk flags without simulation. Use /v1/check instead when you need actual on-chain facts or transaction simulation results.
Side effects
- Missing required 'to' query parameter returns validation error
- Malformed or non-hex 'data' field causes decoding failure
- Unsupported chain identifier returns chain resolution error
- Ambiguous or empty payload may return low-confidence partial decode
- OFAC list may have a staleness lag if not refreshed recently
- No on-chain simulation in /lite — use /v1/check for live state verification
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "transaction",
"tier": "full",
"chain": {
"id": 8453,
"name": "Base"
},
"flags": [
{
"code": "SPENDER_IS_EOA",
"message": "The token allowance goes to 0x3c1A…8d6F, a plain wallet (no contract code). Legitimate apps approve contracts; approvals to wallets are how drainer kits steal funds.",
"severity": "critical"
},
{
"code": "UNLIMITED_APPROVAL",
"message": "Grants an UNLIMITED allowance to 0x3c1A…8d6F.",
"severity": "medium"
}
],
"action": "erc20_approve",
"engine": "signcheck-0.1",
"onchain": {
"block": 52942270,
"chain": "Base",
"tokens": [
{
"name": "USD Coin",
"symbol": "USDC",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"decimals": 6
}
],
"available": true,
"simulation": {
"success": true
}
},
"summary": "Approve 0x3c1A…8d6F to spend UNLIMITED USDC from your wallet",
"verdict": "DANGER",
"sanctions": {
"list": "US Treasury OFAC Specially Designated Nationals (SDN) list",
"matches": 0,
"list_date": "2026-10-21",
"evm_addresses": 124
},
"risk_score": 75,
"counterparties": [
{
"type": "eoa",
"label": null,
"roles": [
"spender"
],
"address": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F"
}
]
}
}Tags
x402
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