x402 Seller Doctor – API Health Audit

x402

x402 Seller Doctor – API Health Audit is a paid API for AI agents from eu-tender-x402-v2-production.up.railway.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).

Audits a URL endpoint for seller/API readiness and returns a scored verdict with detailed findings on what passes, fails, or is broken.

Price / call$0.003

Seller volume →—

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: a numeric readiness score, a verdict enum (ready/needs-fixes/broken), a summary of total checks run and how many passed/failed/critically failed, an array of individual findings each with an ID, severity, pass/fail status, message, evidence, and suggested fix, plus the audited URL, HTTP method, product name, and timestamp of the audit.

Example use cases

Pre-listing x402 API health check

“Before I list my new x402 endpoint at https://myapi.example.com/search for sale, can you run a seller doctor audit on it with a GET request and tell me if it's ready or what needs to be fixed first?”

Debugging a broken seller endpoint

“My x402 API at https://payments.myservice.io/webhook keeps getting rejected — can you run a POST audit on it and show me exactly which checks are failing and what the fixes are?”

Automated CI readiness gate

“Before I deploy this release, audit https://staging.myapp.com/api/product with a GET and give me the score and verdict so I know if it will pass the x402 seller requirements.”

Technical details

Endpoint

POSThttps://eu-tender-x402-v2-production.up.railway.app/api/x402-seller-doctor?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a structured, scored audit of an API endpoint for x402/seller marketplace readiness — especially before listing an API for sale or diagnosing why an existing listing is underperforming. It is distinct from general uptime monitors or EU tender search endpoints on the same host.

Side effects

Invalid or unreachable URL returns an error or broken verdict
Missing required 'url' field causes a 400-level validation error
Payment failure via x402 USDC prevents the call from completing
Target endpoint timeout causes incomplete audit results
Malformed body parameter may cause unexpected audit behavior

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"
  }
}

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