# Wintergreen x402 Content Broker – Search

> Wintergreen x402 Content Broker – Search is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).

Search and retrieve payment-gated AI agent prompts, trading datasets, and market analysis content via a per-call USDC micropayment.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/search
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-content-broker-search-deb3ad78
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OV5QbOmNoOJwji1F5r95u

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 wintergreen-x402-content-broker-search-deb3ad78
```

Example prompt: Search Wintergreen's content broker for AI agent prompts related to 'crypto momentum trading' — use the 'trading-signals' pack and pay the per-call fee in USDC.

## When to prefer this

Choose this endpoint when an AI agent needs ready-made, curated prompts or financial market data gated via x402 micropayment, and the agent has USDC payment capability. Particularly useful when building trading or DeFi agents that need pre-built prompt packs without constructing datasets from scratch.

## Known failure modes

- Payment failure or insufficient USDC balance results in 402 Payment Required with no content returned
- Empty or overly broad query string returns no matching results
- Invalid or unrecognized pack identifier returns empty result set or error
- Unspecified response schema means content structure may be inconsistent or undocumented
- Service unavailability results in timeout or 5xx error

## How this service works

Payment-gated crypto trading intelligence for AI agents.
    
## Categories
- **Hyperliquid Signals**: Real-time funding divergence, lead-lag correlation, liquidation clusters, session volume area levels
- **Quant Methodology**: Backtesting walk-forward validation, strategy generation with kill battery (19 rules), risk management with Kelly sizing, regime detection, execution frameworks, agent orchestration
- **Market Insights**: 22 crypto microstructure observations — funding, liquidation, orderbook, regime, flow, anomaly
- **Power Markets**: ERCOT field guide, merit-order model, duck curve analysis
- **Career Guides**: Firefighter oral board prep, medical coding, ATSA, contractor estimating
- **Trust Scoring**: x402 endpoint verification, P2D badges

## Payment
All paid endpoints return HTTP 402 with USDC on Base (eip155:8453). 
Sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header.
PayTo: 0xAe9834d71F1Bd989A0dc17593451af823E31CeeD

## Output

Returns a list of matching content items — which may include AI agent prompts, trading datasets, or market analysis snippets — gated behind a $0.01 USDC x402 micropayment per call. Response schema is unspecified so structure may vary.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "q": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-content-broker-search-deb3ad78/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.wintergreen.uk](https://www.zero.xyz/host/x402.wintergreen.uk/llms.txt)