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402Check — x402 Endpoint Auditor
x402
402Check — x402 Endpoint Auditor is a paid API for AI agents from agent-json-utility.pablovph.chatgpt.site, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Audits any x402 payment-gated endpoint for protocol compliance and agent-discovery readiness, returning a scored checklist of findings.
Price / call$0.05
Success—
StatusUnknown
How this service works
Audit any x402 payment endpoint for protocol and discovery compatibility.
Output
Returns a JSON object with a boolean `ready` flag, an integer compliance `score` (0–100), an array of named checks each with a pass/fail status and explanatory message, and a plain-English `summary` of the audit findings and any hardening recommendations.
Example use cases
Pre-launch x402 compliance check
“I'm about to list my payment-gated API on an x402 facilitator — can you audit https://api.myservice.com/data with a GET request and tell me if it passes all the protocol checks and what score it gets?”
Debugging a failing x402 POST endpoint
“My x402 POST endpoint at https://api.myservice.com/generate isn't being picked up by agents — can you audit it with a sample body like {"prompt": "hello"} and tell me what checks are failing?”
Verifying x402 v2 protocol upgrade
“I just upgraded my payment endpoint to x402 v2 — can you run an audit on https://api.myservice.com/search via GET to confirm it's now fully compliant and see the updated score?”
Technical details
Endpoint
POSThttps://agent-json-utility.pablovph.chatgpt.site/v1/auditWhen to prefer
Use this endpoint when you need to verify that an x402 payment-gated API is correctly implementing the protocol before listing it on a facilitator, debugging agent-discovery failures, or confirming a protocol version upgrade. It is purpose-built for x402 compliance and returns a structured per-check breakdown with a numeric score, making it more actionable than generic HTTP health checks or manual inspection.
Side effects
- Target URL is unreachable or returns a non-402 status on first probe — audit fails with connectivity error
- Target endpoint does not implement x402 at all — all checks fail, score near zero
- Malformed or missing PaymentRequired header causes protocol-version check to fail
- POST endpoint audit without a body may return unexpected responses, leading to misleading check results
- Rate limiting or firewall on the target URL blocks the auditor probe
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTPS x402 endpoint to audit |
| body | object | Optional JSON body for a POST endpoint |
| method | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ready": true,
"score": 92,
"checks": [
{
"id": "status-402",
"passed": true,
"message": "Endpoint returns HTTP 402"
},
{
"id": "protocol-v2",
"passed": true,
"message": "PaymentRequired uses x402 v2"
}
],
"summary": "Protocol-ready with one hardening recommendation."
}
}Tags
x402
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