# P0 Agent Economy Index – Devtools Tag Discovery

> P0 Agent Economy Index – Devtools Tag Discovery is a paid API for AI agents from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev, paid per call via x402, $0.048/call, status unknown (last checked 2026-10-22).

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

## Facts

- Endpoint: GET https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/in-devtools?utm_source=zero.xyz
- Price: $0.048/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/p0-agent-economy-index-devtools-tag-discovery-66446a46
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wUUFdcZ8ccyV31I5hmXzB

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-devtools-tag-discovery-66446a46
```

Example prompt: Show me the top 25 devtools services in the x402 agent economy ranked by unique paying wallets over the last 30 days, with their call counts and prices.

## When to prefer this

Use this endpoint when an agent needs to discover real, actively-used developer tool APIs in the x402 agent economy, ranked by genuine economic signal (unique paying wallets) rather than self-reported popularity. It is the right choice over generic API directories when you need machine-to-machine market intelligence specifically for the devtools vertical, backed by a verifiable 30-day snapshot with a receipt hash. Do not use it for L402 listings, Tempo MPP per-service listings, or cross-protocol aggregated totals.

## Known failure modes

- No services tagged 'devtools' currently indexed — returns empty services array
- Snapshot temporarily stale if the indexing worker has not run recently
- HTTP 402 if USDC payment of $0.048 is not attached or is insufficient
- Worker timeout if the index is large and filtering is slow
- Malformed response if the upstream registry sources are unavailable

## 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 count of matched results (up to 25), the query parameters used (ranking by payers, top 25, devtools tag), the matched total in the index, an array of services each with name, network (e.g. eip155:8453), 30-day call count, price in USD, resource URL, and 30-day unique payer count, plus metadata including who declared the data, the snapshot generation timestamp, and the scoring revision 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": "devtools"
   }
  },
  "route": "/in-devtools",
  "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-devtools-tag-discovery-66446a46/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)