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SignalHarness EIP-2612 Permit Inspector
x402
SignalHarness EIP-2612 Permit Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Inspects and validates EIP-2612 permit data (gasless token approval signatures) supplied by the caller, returning warnings and a structured analysis of the permit's contents and safety.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object with a top-level 'result' containing a 'permit_inspection' summary string, a list of 'warnings', the 'evidence_scope' (e.g. 'caller_supplied_data'), and a 'replay' boolean indicating replay-attack risk. Also includes a full execution receipt with payment details, latency, and a SHA-256 hash of the result for auditability.
Example use cases
DeFi dApp permit safety check
“I'm about to sign a permit to allow a DeFi protocol to spend my USDC — can you inspect this permit data and tell me if there are any warnings or if it looks safe? Here's the raw permit: {permit_data_string}.”
Replay attack detection before signing
“Check this EIP-2612 permit for replay attack risk and any other issues before I approve it — is the nonce and deadline reasonable? Permit data: {permit_data_string}.”
Agent-automated permit audit pipeline
“Before executing any token approval in my DeFi agent workflow, inspect this permit and surface any warnings so I can decide whether to proceed: {permit_data_string}.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/permit_inspect_eip2612/invokeWhen to prefer
Choose this endpoint when an AI agent or user needs to programmatically audit an EIP-2612 gasless token approval permit before signing — especially to detect replay risks, suspicious spender addresses, abnormal deadlines, or other red flags. Prefer this over generic smart-contract analysis tools when the specific input is an EIP-2612 permit structure and you need structured warnings and a replay flag in a single low-cost call ($0.01 USDC).
Side effects
- Invalid or malformed permit data causes processing failure
- permit_inspection_request below minimum length (2 chars) returns validation error
- Oversized input exceeding 65536 characters rejected
- Payment failure on x402 channel results in 402 response before execution
- Unsupported permit format not conforming to EIP-2612 may yield incomplete inspection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| permit_inspection_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Inspection does not verify nonce, signature, balance, or allowance state."
],
"service_id": "permit_inspect_eip2612",
"evidence_scope": "caller_supplied_data",
"permit_inspection": "{\"deadline\":\"2000000000\",\"expired_at_ms\":false,\"nonce\":\"1\",\"owner\":\"0x0000000000000000000000000000000000000001\",\"source\":\"fields\",\"spender\":\"0x0000000000000000000000000000000000000002\",\"value\":\"100\"}"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "permit_inspect_eip2612",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "850bd8c2e3e64d68f6ce07c45a0408df0825974d4a549b7779544bc92890e082",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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