# agent-audit Quote Check

> agent-audit Quote Check is a paid API for AI agents from agent-audit.agent-audit.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).

Verifies a quoted price or offer against a live x402 seller endpoint, returning a match verdict and similarity score

## Facts

- Endpoint: GET https://agent-audit.agent-audit.workers.dev/v1/quote-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-audit-quote-check-09f36d5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ygX8-r2Uhir8fglnbyCUr

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 agent-audit-quote-check-09f36d5a
```

Example prompt: Can you verify that the quote 'QUOTEabc123xyz' from seller URL https://seller.example.com/api/item is accurate and matches the live listing?

## When to prefer this

Use this endpoint when an AI agent needs to verify the integrity of an x402 payment quote before committing to a transaction, or when auditing whether a seller's advertised offer is still live and accurate. Prefer this over manual inspection when operating in automated agent-to-agent marketplaces where quote tampering or staleness is a concern.

## Known failure modes

- Invalid or malformed quote string returns error verdict
- Seller URL is unreachable or unhealthy causing link health failure
- Quote has expired or been revoked resulting in non-matching verdict
- Missing required query parameters (url or quote) returns a 4xx error
- Quote string too short (under 8 chars) or too long (over 2000 chars) triggers schema validation error

## How this service works

Read-only x402 seller audit, link health and quote verification. Pay per call in USDC on Base via x402.

## Output

Returns a JSON object with a status code, a verdict string (e.g. 'found_exact', indicating how closely the provided quote matches the live seller), and a similarity score between 0 and 1, where 1 indicates an exact match.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url",
      "quote"
     ],
     "properties": {
      "url": {
       "type": "string"
      },
      "quote": {
       "type": "string",
       "maxLength": 2000,
       "minLength": 8
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "status": 200,
  "verdict": "found_exact",
  "similarity": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-audit-quote-check-09f36d5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-audit.agent-audit.workers.dev](https://www.zero.xyz/host/agent-audit.agent-audit.workers.dev/llms.txt)