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agent-audit Quote Check
x402
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
Price / call$0.005
Success—
StatusUnknown
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.
Example use cases
Pre-payment quote integrity check
“Before I pay this x402 seller at https://seller.example.workers.dev/v1/data, check that the quote 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.abc' they gave me is legitimate and matches what's actually being offered.”
Detecting stale or tampered quote
“I received a quote 'QUOTE_ZX9987_ABCD' from https://ai-seller.example.com/v1/report — can you audit it to make sure it hasn't been tampered with or expired before I proceed?”
Automated agent marketplace trust check
“My buying agent is about to pay an x402 seller at https://data-provider.example.workers.dev/v1/results — run a quote check on the quote string 'q_v2_9fXkLm3pQrTy' to confirm the link is healthy and the quote is exactly what was advertised.”
Technical details
Endpoint
GEThttps://agent-audit.agent-audit.workers.dev/v1/quote-check?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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- Quote has expired or been revoked resulting in non-matching verdict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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": 200,
"verdict": "found_exact",
"similarity": 1
}
}Tags
x402
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