# x402 Bazaar Rank – BTC-Tagged Services

> x402 Bazaar Rank – BTC-Tagged Services 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 2026-10-02).

Returns a ranked list of the top x402 services tagged 'btc', ordered by 30-day unique paying wallets, with call volume, price, and a signed snapshot receipt.

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/in-btc?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-bazaar-rank-btc-tagged-services-0feb53ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2uq3SOwqgZwgERawRAZoR

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-btc-tagged-services-0feb53ea
```

Example prompt: Show me the top BTC-tagged services on the x402 bazaar, ranked by how many paying wallets used them in the last 30 days — I want to see which bitcoin APIs are actually getting real usage.

## When to prefer this

Choose this endpoint when you specifically need a ranked, usage-verified discovery of BTC-tagged x402 services — it provides real 30-day signal (calls and paying wallets) rather than static listings. Prefer it over generic x402 explorers when the user wants to find the most proven or popular bitcoin-related APIs, or when verifiability via snapshot hash matters. Use sibling endpoints for other tag categories (stocks, macro, fun, etc.).

## Known failure modes

- No BTC-tagged services indexed — returns empty services array with count:0
- Snapshot stale — generatedAt timestamp may lag real-time by indexer delay
- Payment not processed — 402 response if USDC payment not attached
- Worker timeout — Cloudflare Worker cold start may cause latency spike
- Schema mismatch — input schema is minimal; malformed query params silently ignored

## How this service works

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.

## Output

A JSON object containing a ranked array of up to 25 BTC-tagged x402 services, each with its name, network (e.g. eip155:8453), 30-day call count, price in USD, resource URL, and 30-day unique payer count. Also includes query metadata (route, matched count, limit, operator), a snapshot hash for verifiability, scoring revision, and a generatedAt 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": "btc"
   }
  },
  "route": "/in-btc",
  "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-btc-tagged-services-0feb53ea/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)