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Agent Audit - x402 Seller Link Health & Quote Verifier
x402
Agent Audit - x402 Seller Link Health & Quote Verifier is a paid API for AI agents from agent-audit.agent-audit.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-18).
Audits an x402 paid endpoint URL for link health, quote validity, and seller compliance, returning a grade, score, and categorized findings.
Price / call$0.02
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 an overall letter grade (e.g. 'C'), a numeric score (0–100), a breakdown of pass/fail/warn counts, and a detailed findings array where each finding has an id, human-readable message, and severity level (pass, warn, or fail).
Example use cases
Pre-launch x402 seller readiness check
“Before I go live, can you audit my x402 API at https://myservice.workers.dev/v1/paid to see if it passes all the seller requirements and tell me what grade it gets?”
Diagnosing a failing paid endpoint
“My x402 endpoint at https://api.myproduct.com/v1/premium seems to be rejecting payments — can you audit it and show me exactly what checks are failing and why?”
Verifying llms.txt and quote health
“Can you audit https://data.myagentservice.com/v1/endpoint for me? I want to know if the /llms.txt is present, the quote is valid, and what warnings I should fix to get a better score.”
Technical details
Endpoint
GEThttps://agent-audit.agent-audit.workers.dev/v1/audit?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically audit an x402-compatible paid API endpoint for spec compliance, link health, and quote validity. It is specifically designed for the x402 payment protocol ecosystem and produces structured, actionable findings — prefer it over generic uptime monitors or HTTP health checks when you need x402-aware validation including quote verification and seller-side compliance scoring.
Side effects
- Missing or invalid 'url' query parameter returns an error
- Unreachable target URL may result in all checks failing or a timeout
- Malformed x402 endpoint may return low score with multiple fail findings
- Payment failure (USDC on Base) prevents the audit from executing
- Rate limiting or Cloudflare Worker downtime may cause 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"grade": "C",
"score": 72,
"counts": {
"fail": 0,
"pass": 12,
"warn": 7
},
"findings": [
{
"id": "llms-missing",
"message": "No /llms.txt (404)",
"severity": "warn"
}
]
}
}Tags
x402
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