# P0 Agent Economy Index – /in-form-4 Form-4 Tagged Services

> P0 Agent Economy Index – /in-form-4 Form-4 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 2026-10-16).

Returns a ranked list of x402 services tagged 'form-4', scored by real 30-day call and payer activity, with a snapshot receipt.

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/in-form-4?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/p0-agent-economy-index-in-form-4-form-4-tagged-services-352ae7ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_m4d6rvqHy-fTwMCYejOy7

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-in-form-4-form-4-tagged-services-352ae7ac
```

Example prompt: Show me the top 25 x402 services tagged 'form-4', ranked by number of paying wallets over the last 30 days, using the P0 Agent Economy Index.

## When to prefer this

Use this endpoint when you need a pre-scored, payer-verified ranked list of x402 services specifically tagged 'form-4' and want real 30-day activity signals rather than a raw registry dump. Prefer this over generic x402 service listings when you need to compare form-4 data providers by actual paying-agent demand, or when you need a verifiable snapshot receipt for auditing which services were live at a given revision.

## Known failure modes

- No services indexed for the form-4 tag returns an empty services array
- Stale snapshot if the index worker has not refreshed within the window
- HTTP 402 if the $0.008 USDC payment is not attached or is malformed
- Worker cold-start or Cloudflare outage returns 5xx
- Incomplete payer/volume data if upstream x402scan has gaps

## 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 the query parameters used, total matched services, a ranked array of up to 25 services each with name, network, 30-day call count, USD price, resource URL, and 30-day payer count, plus a generatedAt timestamp and 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": "form-4"
   }
  },
  "route": "/in-form-4",
  "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-in-form-4-form-4-tagged-services-352ae7ac/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)