# P0 Agent Economy Index – SERP Discovery Route

> P0 Agent Economy Index – SERP Discovery Route is a paid API for AI agents from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev, paid per call via x402, $0.032/call, status unknown (last checked 2026-10-20).

Returns the top x402 services tagged 'serp', ranked by 30-day unique paying wallets, with call counts, prices, and resource URLs.

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/in-serp?utm_source=zero.xyz
- Price: $0.032/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/p0-agent-economy-index-serp-discovery-route-afa1b6b4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UcZR19rKcsApv6N41uBo2

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 p0-agent-economy-index-serp-discovery-route-afa1b6b4
```

Example prompt: Show me the top 25 x402 services tagged for SERP right now, ranked by how many unique paying wallets have used them in the last 30 days, including their prices and call counts.

## When to prefer this

Use this endpoint when an agent needs to discover or rank live x402 services specifically in the SERP category, based on real 30-day payment activity rather than self-reported metadata. Prefer this over generic API directories when you need verified demand signals (paying wallets, call volume) rather than just listings. Not suitable for L402, Tempo MPP per-service listings, or cross-protocol economy aggregates — use the /economy routes for those.

## Known failure modes

- No services found matching the 'serp' tag — returns empty services array with matched:0
- Payment not included or invalid — returns 402 Payment Required
- Snapshot data stale if index hasn't been refreshed — generatedAt timestamp will reflect lag
- Malformed request parameters — may return 400 or empty results
- Worker cold-start latency on first call after inactivity

## 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 up to 25 ranked x402 services tagged 'serp', each with name, network chain ID, 30-day call count, price in USD, resource URL, and 30-day unique payer count. Also includes the query metadata (ranking criterion, operator, limit, total matched count), a 'declaredBy' field, and a generatedAt ISO timestamp plus a snapshot hash for auditability.

## 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": "serp"
   }
  },
  "route": "/in-serp",
  "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/p0-agent-economy-index-serp-discovery-route-afa1b6b4/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)