# x402 Bazaar Rank – MCP-Tagged Service Discovery

> x402 Bazaar Rank – MCP-Tagged Service Discovery is a paid API for AI agents from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-18).

Returns a ranked list of live x402 micropayment services tagged 'mcp', scored by 30-day call volume and unique paying wallets, with a snapshot hash and scoring revision receipt.

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/in-mcp?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-bazaar-rank-mcp-tagged-service-discovery-d8cb1b64
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_83hufoiVl14E_r7V3uGuT

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-bazaar-rank-mcp-tagged-service-discovery-d8cb1b64
```

Example prompt: Show me the top 25 x402 services tagged 'mcp', ranked by how many unique paying wallets used them in the last 30 days, and include the snapshot hash so I can verify the data freshness.

## When to prefer this

Choose this endpoint when you need objective, usage-verified rankings of x402 MCP services backed by on-chain payment data rather than self-reported metadata. Prefer it over generic API directories when you specifically want services that have demonstrated real paying traffic in the last 30 days on the x402 protocol, and need an auditable snapshot hash to verify data provenance.

## Known failure modes

- Network or Cloudflare Worker timeout returns no data
- Snapshot index not yet refreshed returns stale or empty results
- Query parameters malformed returns an error or empty service list
- No services match the mcp tag in the current snapshot returns count:0
- x402 payment of $0.008 USDC not completed results in 402 Payment Required response

## How this service works

An open index of the machine-to-machine (agent) economy. x402 routes: ranked discovery over the live x402 service market, every indexed service scored by real 30-day calls and paying-wallet bounds, with a receipt naming the snapshot hash and scoring revision. /economy routes, for Tempo MPP, Virtuals ACP, Olas, Masumi, ERC-8004 agent registries, Solana agent registries, Base agent contracts and MCP servers (Official MCP Registry): each protocol's published figures (agent or server counts, transactions or payment events; payers and USD volume only where the source publishes them: payers for x402 and Tempo MPP, USD volume for x402 and Virtuals ACP), each with its unit, window and source; units differ, so totals are not summed. L402 and per-service MPP listings are not covered.

## Output

A JSON object containing a ranked array of up to 25 x402 services tagged 'mcp', each with name, blockchain network, 30-day call count, USD price, resource URL, and unique paying wallet count; plus aggregate metadata including total matched services, query parameters used, snapshot hash, scoring revision, and generation timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 25,
  "query": {
   "by": "payers",
   "op": "top",
   "limit": 25,
   "where": {
    "tag": "mcp"
   }
  },
  "route": "/in-mcp",
  "matched": 359,
  "services": [
   {
    "name": "forecast api",
    "network": "eip155:8453",
    "calls30d": 310,
    "priceUsd": 0.01,
    "resource": "https://api.example.com/forecast",
    "payers30d": 42
   }
  ],
  "declaredBy": "agent",
  "generatedAt": "2026-09-17T12:00:00.000Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-bazaar-rank-mcp-tagged-service-discovery-d8cb1b64/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev](https://www.zero.xyz/host/x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/llms.txt)