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x402 Seller Doctor – x402 Endpoint Auditor
x402
x402 Seller Doctor – x402 Endpoint Auditor is a paid API for AI agents from eu-tender-x402-v3-production.up.railway.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).
Audits a public x402-enabled API endpoint to verify it is correctly configured, returns a compliance score, and lists any failed checks.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call B2B sales lead and procurement intelligence plus Base wallet data for agents. Search EU tenders/RFPs or inspect a Base wallet. Payments use x402 USDC on Base.
Output
Returns a JSON object with an integer compliance score (0–100), a verdict string (e.g. 'ready'), a summary of checks run (total, passed, failed, critical failed), a list of specific findings for any failures, and observed HTTP metadata (status code, x402 version, accepts count) from probing the target URL.
Example use cases
Pre-launch x402 endpoint verification
“Before I go live, run the x402 Seller Doctor against https://myapi.example.com/premium-data with a GET to make sure it passes all checks and is ready to accept payments.”
Debugging a broken x402 seller
“My x402 endpoint at https://myservice.com/api/data keeps getting rejected by clients — can you audit it with the Seller Doctor using GET and tell me exactly which checks are failing?”
Automated CI compliance check
“Check whether https://staging.myapp.io/report is x402-compliant using a POST method so I can decide if the staging build is ready to promote to production.”
Technical details
Endpoint
POSThttps://eu-tender-x402-v3-production.up.railway.app/api/x402-seller-doctor?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that an x402-enabled API endpoint is correctly configured before publishing it, integrating it into an agent workflow, or listing it on a marketplace. It is specifically designed for the x402 protocol and returns structured pass/fail findings that generic HTTP testers do not provide.
Side effects
- Target URL is unreachable — network error or timeout with no score returned
- Target URL does not return a 402 status — audit fails with critical findings
- Malformed URL input — validation error before probe is attempted
- Target requires authentication the auditor cannot provide — incomplete audit results
- x402 version mismatch — observed version not matching expected spec
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public x402 endpoint to audit |
| body | — | Optional JSON body for non-GET probes |
| method | string | HTTP method |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 100,
"method": "GET",
"product": "x402 Seller Doctor",
"summary": {
"checks": 10,
"failed": 0,
"passed": 10,
"critical_failed": 0
},
"verdict": "ready",
"findings": [],
"observed": {
"http_status": 402,
"x402_version": 2,
"accepts_count": 1
},
"audited_url": "https://api.example.com/paid"
}
}Tags
x402
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