# x402 Market Intel – Search Rank Monitor

> x402 Market Intel – Search Rank Monitor is a paid API for AI agents from x402-market-intel-mcp.mtree.workers.dev, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Tracks and returns ranking snapshots for x402 paid API endpoints across search queries, showing rank position, rank delta, and indexed resource counts.

## Facts

- Endpoint: POST https://x402-market-intel-mcp.mtree.workers.dev/v1/x402/search_rank_monitor
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-market-intel-search-rank-monitor-4d826b53
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UwK5vGtQx-InaxSGxeG0D

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-market-intel-search-rank-monitor-4d826b53 -d '<json body>'
```

Example prompt: What's the current x402 search rank for 'paid api discovery' — show me the rank delta, the best rank it has hit, and how many indexed resources there are for that query.

## When to prefer this

Choose this endpoint when you need to monitor or benchmark how a specific x402 paid API or search term ranks within the x402 marketplace ecosystem — especially when you want rank delta and historical best-rank data. Prefer this over general web ranking tools when working specifically within the x402 / mtree paid API discovery space.

## Known failure modes

- Invalid or missing query parameter returns an error response
- Payment not processed (402) if USDC micropayment is not attached
- Rate limiting if too many calls in a short window
- Query term not indexed returns empty rank_snapshots array
- Network or Cloudflare Worker timeout on the backend

## How this service works

Machine-indexable paid x402 buyer-intelligence API for service ranking, endpoint risk, provider dossiers, paid API discovery, seller scores, and category trends.

## Output

Returns a JSON array of rank snapshots, each containing the query term, current rank delta, the best rank achieved (mt_best_rank), and the count of indexed x402 resources for that query. The response also includes an ok boolean confirming success.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "type": "object",
     "properties": {
      "queries": {
       "type": "array",
       "items": {
        "type": "string"
       },
       "minItems": 1,
       "maxItems": 20
      },
      "query": {
       "type": "string"
      },
      "limit": {
       "type": "integer",
       "minimum": 1,
       "maximum": 25
      },
      "persist": {
       "type": "boolean"
      }
     }
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   },
   "required": [
    "type"
   ]
  }
 },
 "required": [
  "input"
 ]
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "rank_snapshots": [
   {
    "query": "paid api discovery",
    "rank_delta": 0,
    "mt_best_rank": 1,
    "indexed_mt_resources": 3
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-market-intel-search-rank-monitor-4d826b53/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-market-intel-mcp.mtree.workers.dev](https://www.zero.xyz/host/x402-market-intel-mcp.mtree.workers.dev/llms.txt)