# Base Permit Inspect — EIP-2612 Permit Signature Analyzer

> Base Permit Inspect — EIP-2612 Permit Signature Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Analyzes and validates EIP-2612 permit signature JSON for the Base blockchain, returning decoded fields, risk flags, expiry status, and network context.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/base_permit_inspect/invoke
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-permit-inspect-eip-2612-permit-signature-analyzer-1cc7b77f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zst6xLpi6nLNjtZ2utbcu

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability base-permit-inspect-eip-2612-permit-signature-analyzer-1cc7b77f -d '<json body>'
```

Example prompt: Can you inspect this EIP-2612 permit signature JSON for me and tell me if it has any risk flags, whether it's expired, and what the owner, spender, deadline, and nonce are on Base mainnet?

## When to prefer this

Use this endpoint when you need to programmatically decode and risk-assess an EIP-2612 permit signature specifically on Base (chainId 8453) or Base Sepolia. It is purpose-built for Base network permit inspection, returning structured risk flags and network-aware context. Prefer it over generic ABI decoders when you need expiry analysis, risk flagging, and OP Stack fee model context in a single call for $0.015 USDC.

## Known failure modes

- Malformed or invalid permit JSON results in a parse error
- Missing required permit fields returns incomplete analysis
- Unsupported chain ID may result in unknown network context
- Permit with future deadline marked as expiry_not_evaluated if deadline evaluation is skipped
- No signature provided returns warning: 'No signature is requested, verified, or submitted'

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a structured analysis JSON containing the decoded permit fields (amount_atomic, deadline, nonce, owner, spender, domain chainId), permit type (e.g. eip2612), expiry status, risk flags (e.g. expiry_not_evaluated), network context (accepted chain IDs, fee model, transaction type, protocol family), evidence scope, and analyzed network name. Also includes a receipt with service ID, payment ID, execution metadata, and a SHA-256 hash of the result.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request_json": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "No signature is requested, verified, or submitted."
   ],
   "service_id": "base_permit_inspect",
   "analysis_json": "{\"amount_atomic\":\"100\",\"deadline\":\"2000000000\",\"domain\":{\"chainId\":\"8453\"},\"expired_at_observation\":null,\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"nonce\":\"1\",\"owner\":\"0x0000000000000000000000000000000000000001\",\"permit_type\":\"eip2612\",\"risk_flags\":[\"expiry_not_evaluated\"],\"spender\":\"0x0000000000000000000000000000000000000002\"}",
   "evidence_scope": "caller_supplied_data",
   "analyzed_network": "base"
  },
  "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": "base_permit_inspect",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "15000",
   "resultSha256": "e5063497cd1a68acd363cc4c3527fae5de8d7b04a12892aacd7199e906cfcf21",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-permit-inspect-eip-2612-permit-signature-analyzer-1cc7b77f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)