# P0 Agent Economy Index – Legal Tag Discovery

> P0 Agent Economy Index – Legal Tag 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 2026-10-21).

Returns the top x402 services tagged 'legal', ranked by real 30-day call volume and payer counts, with a signed snapshot receipt.

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/in-legal?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/p0-agent-economy-index-legal-tag-discovery-af51151c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZINuafwETfJmcgvR6tsiW

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-legal-tag-discovery-af51151c
```

Example prompt: Show me the top 25 legal-tagged x402 services ranked by number of paying wallets over the last 30 days, so I can see which legal APIs agents are actually using and paying for.

## When to prefer this

Use this endpoint when an agent needs to discover and rank x402-protocol services specifically in the legal domain based on real usage signals (calls and paying wallets) rather than self-reported metadata. Prefer it over general web search or registry lookups when you need verifiable, payment-backed popularity data with a snapshot receipt for auditability.

## Known failure modes

- No services currently tagged 'legal' in the index returns an empty services array
- Stale snapshot if the index has not been updated recently
- HTTP 402 if the $0.008 USDC payment is not attached or fails
- Malformed response if the upstream worker is unavailable
- Score or count figures may reflect a lagging 30-day window rather than real-time data

## 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 list of up to 25 x402 services tagged 'legal', each with service name, network (e.g. eip155:8453), 30-day call count, 30-day unique payer count, price in USD, and resource URL. Also includes query metadata (route, total matched count, ranking criterion), the declarant type, and a generatedAt timestamp serving as a signed snapshot receipt.

## 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": "legal"
   }
  },
  "route": "/in-legal",
  "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-legal-tag-discovery-af51151c/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)