# x402 Directory Rank Tracker

> x402 Directory Rank Tracker is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.01/call, status down (last checked 2026-09-16).

Checks the visibility and ranking position of an x402-payable API service across multiple x402 discovery directories

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/x402-directory-rank-tracker
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-directory-rank-tracker-19590b64
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__wuVa8N8FXKQwib5Cx3C1

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 x402-directory-rank-tracker-19590b64 -d '<json body>'
```

Example prompt: Can you check how visible and well-ranked my x402 API service 'gpt-5.5 x402' is across all the major x402 discovery directories like cdp-bazaar and x402scan, and tell me its visibility score and where it first appears?

## When to prefer this

Use this endpoint when you need to audit how discoverable a specific x402-payable API service is across decentralized x402 directories. Prefer this over manual directory checks when you want a single aggregated visibility score and ranked position data across up to 7 sources (x402.direct, cdp-bazaar, agora402, x402-list, a2alist, payai-discovery, gate402) in one call.

## Known failure modes

- No query or identifier provided — returns error requiring at least one of: url, base_url, host, service_name, name, payTo, or query
- Directory sources unreachable — partial results returned with reduced matchedSourceCount
- timeout_ms exceeded — may return incomplete results if directories are slow to respond
- No matches found across any source — returns matchedSourceCount of 0 with recommendations
- Invalid source enum value — rejected by schema validation

## How this service works

Low-price OpenAI-compatible GPT-5.5 chat completions and text tools over x402 USDC on Base: $0.0001 compact requests, $0.066667 true max-output requests, no subscription.

## Output

Returns a JSON object with a visibilityScore (0-100), bestMatches array showing page, source, price, and first-seen position, count of checked and matched sources, whether results were sampled, and actionable recommendations to improve indexing.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "limit": 50,
   "pages": 1,
   "sources": [
    "x402.direct",
    "cdp-bazaar"
   ],
   "timeout_ms": 5000,
   "service_name": "gpt-5-5-api"
  }
 },
 "output": {
  "type": "object",
  "example": {
   "ok": true,
   "tool": "x402-directory-rank-tracker",
   "fetchedAt": "2024-01-15T10:30:00Z"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "x402DirectoryRankTracker",
  "query": "gpt-5.5 x402",
  "sampled": true,
  "bestMatches": [
   {
    "page": 1,
    "source": "cdp-bazaar",
    "minPriceUsd": "0.0001",
    "firstSeenPosition": 4
   }
  ],
  "recommendations": [
   "Refresh free x402scan/Bazaar indexing after material metadata changes."
  ],
  "visibilityScore": 58,
  "checkedSourceCount": 6,
  "matchedSourceCount": 3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-directory-rank-tracker-19590b64/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)