# x402 Builder Brief

> x402 Builder Brief is a paid API for AI agents from srv1334799.hstgr.cloud, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Returns a decision-ready builder brief for the x402 ecosystem: demand movers, underserved categories, new competitors, price anomalies, host concentration, and three scored opportunities with evidence and caveats.

## Facts

- Endpoint: GET https://srv1334799.hstgr.cloud/v1/x402/demand/builder-brief
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-builder-brief-91ab86cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QSPRIjggbAyAbYyS_dRik

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-builder-brief-91ab86cf
```

Example prompt: Give me a full x402 builder brief — I want to see the top demand movers, any underserved categories, new competitors, price anomalies, host concentration issues, and the three best-scored product opportunities with supporting evidence and caveats so I can decide what to build next.

## When to prefer this

Use this endpoint when you need a single comprehensive, decision-ready market brief for building x402 products, covering all major market signals in one call. Prefer this over narrower endpoints (demand radar, category ranker, repeat buyers) when you want a synthesized, scored multi-signal output rather than raw data on a single dimension.

## Known failure modes

- Upstream x402scan or Bazaar data unavailable — returns partial data or error
- No meaningful demand changes detected — brief may reflect stale market snapshot
- Rate limiting or payment verification failure — returns 402 or 429 status
- Empty opportunity set if market data is sparse

## How this service works

Decision-ready x402 builder brief in one call: demand movers, underserved categories, new competitors, price anomalies, host concentration, and three scored opportunities with evidence and caveats.

## Output

A structured builder brief covering: top demand movers in x402 categories, underserved categories with opportunity signals, newly appearing competitors, price anomalies across paid endpoints, host concentration metrics, and three ranked product opportunities each with a score, supporting evidence from public x402 data, and explicit caveats about data limitations.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-builder-brief-91ab86cf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from srv1334799.hstgr.cloud](https://www.zero.xyz/host/srv1334799.hstgr.cloud/llms.txt)