# Revenue Swarm x402 Seller Fix Diagnostic

> Revenue Swarm x402 Seller Fix Diagnostic 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 endpoint for compliance, correctness, and implementation quality, returning a scored report with actionable findings.

## Facts

- Endpoint: POST https://eu-tender-x402-v3-production.up.railway.app/api/x402-seller-fix?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/revenue-swarm-x402-seller-fix-diagnostic-ecf2c1f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WehkfxbptdVJEEPFCHr3A

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability revenue-swarm-x402-seller-fix-diagnostic-ecf2c1f6 -d '<json body>'
```

Example prompt: Can you run the x402 seller fix audit on my endpoint at https://api.myservice.com/paid using a GET request and tell me what's failing and how to fix it?

## When to prefer this

Use this endpoint when you need to programmatically audit an x402-enabled API for standards compliance before deployment, troubleshoot why an x402 payment flow is broken, or get a structured checklist of fixes for a seller-side x402 implementation. Prefer this over manual inspection when you want a scored, reproducible compliance report with specific fix guidance.

## Known failure modes

- Unreachable target URL returns connection error
- Non-x402 endpoint returns unexpected HTTP status causing low score
- Missing or malformed response body from target endpoint
- Invalid method value causes request rejection
- Target endpoint behind auth wall prevents proper inspection

## 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 compliance score (0-100), an overall verdict (e.g. 'needs-fixes' or 'compliant'), a summary of how many checks passed/failed (including critical failures), a list of individual findings with IDs and suggested fixes, and observed HTTP metadata such as status code and x402 version.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public x402 endpoint to diagnose"
  },
  "body": {
   "description": "Optional JSON body for non-GET probes"
  },
  "method": {
   "type": "string",
   "default": "GET",
   "description": "HTTP method"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 88,
  "method": "GET",
  "product": "x402 Seller Fix",
  "summary": {
   "checks": 10,
   "failed": 2,
   "passed": 8,
   "critical_failed": 0
  },
  "verdict": "needs-fixes",
  "findings": [
   {
    "id": "openapi",
    "fix": "Publish /openapi.json",
    "pass": false
   }
  ],
  "observed": {
   "http_status": 402,
   "x402_version": 2,
   "accepts_count": 1
  },
  "audited_url": "https://api.example.com/paid"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/revenue-swarm-x402-seller-fix-diagnostic-ecf2c1f6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from eu-tender-x402-v3-production.up.railway.app](https://www.zero.xyz/host/eu-tender-x402-v3-production.up.railway.app/llms.txt)