# x402 CDP Bazaar Seller Rank Check

> x402 CDP Bazaar Seller Rank Check is a paid API for AI agents from x402-endpoints.onrender.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Returns the current keyword-relevance discovery rank of an x402 seller in the CDP Bazaar, including best rank and per-category-keyword rank, for discoverability monitoring.

## Facts

- Endpoint: GET https://x402-endpoints.onrender.com/agent/rank-check
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-cdp-bazaar-seller-rank-check-858d3a8b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VvO1cDlL6JzpOS8jhOBUQ

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-cdp-bazaar-seller-rank-check-858d3a8b
```

Example prompt: What's my current CDP Bazaar discovery rank right now for my x402 seller at api.example.com — am I being out-ranked on my category keywords?

## When to prefer this

Use this endpoint for lightweight, frequent polling of a single seller's current keyword-relevance rank in the CDP Bazaar — it's cheaper and faster than the full /agent/visibility-audit, making it ideal for monitoring loops or alerting workflows. Prefer it when you only need a quick rank pulse rather than a deep audit of seller trustworthiness or visibility strategy.

## Known failure modes

- Invalid or missing seller parameter — returns error if wallet address is malformed (not 0x + 40 hex) or domain is unrecognizable
- Seller not found in CDP Bazaar — returns no rank data if the seller has never been indexed
- Payment failure — returns 402 if USDC payment is not supplied or insufficient
- Service unavailable — render.com cold-start latency or downtime may cause timeouts
- Rate limiting — too many rapid rank-check calls may be throttled

## How this service works

Quick check of where an x402 seller ranks RIGHT NOW by keyword-relevance in the CDP Bazaar discovery (not the raw settled-volume rank the free explorers show): best rank + per-category-keyword rank in one cheap call, plus a pointer to the full /agent/visibility-audit when the rank slips. The frequent pulse for monitoring your x402 discoverability. Where do I rank now? Am I being out-ranked on my category keywords?

## Output

Returns the seller's current best keyword-relevance rank in the CDP Bazaar discovery system, a breakdown of rank per category keyword, and a pointer to the full /agent/visibility-audit endpoint if the rank has slipped — all in a single cheap call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "seller"
     ],
     "properties": {
      "seller": {
       "type": "string",
       "description": "Seller to check: wallet (0x + 40 hex) or origin URL/domain, e.g. 'api.example.com'"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Keyword-RELEVANCE rank in CDP Bazaar discovery/search — not the raw settled-volume rank the free explorers show.",
  "error": null,
  "cached": false,
  "seller": "api.example.com",
  "upsell": "/agent/visibility-audit",
  "headline": "Best rank #14 (outside the top 10) — you're being out-ranked.",
  "best_rank": 14,
  "timestamp": "2026-07-02T12:00:00Z",
  "per_keyword": [
   {
    "rank": 14,
    "keyword": "kyb",
    "scanned": 20
   },
   {
    "rank": null,
    "keyword": "compliance",
    "scanned": 20
   }
  ],
  "data_freshness": {
   "as_of": "2026-07-02T12:00:00Z",
   "sources": [
    "CDP Bazaar discovery/search (keyword-relevance rank per category)"
   ],
   "age_seconds": 0,
   "retrieved_at": "2026-07-02T12:00:00Z",
   "deterministic": true
  },
  "recommendation": "Rank is slipping on ['compliance'] → run /agent/visibility-audit for the metadata score, prioritized fixes and a signed delta over time.",
  "signed_receipt": {
   "claims": {
    "kind": "agent_rank_check",
    "as_of": "2026-07-02T12:00:00Z",
    "issuer": "x402-endpoints.onrender.com",
    "seller": "api.example.com",
    "best_rank": 14,
    "issued_at": "2026-07-02T12:00:00Z",
    "best_keyword_ranks": {
     "kyb": 14,
     "compliance": null
    }
   },
   "algorithm": "ed25519",
   "available": true,
   "signature": "<hex>",
   "public_key": "5b77...9f9d"
  },
  "category_keywords": [
   "kyb",
   "compliance",
   "vat"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-cdp-bazaar-seller-rank-check-858d3a8b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-endpoints.onrender.com](https://www.zero.xyz/host/x402-endpoints.onrender.com/llms.txt)