# Wintergreen x402 Content Broker — Prompts by Category

> Wintergreen x402 Content Broker — Prompts by Category is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns payment-gated AI agent prompts, trading datasets, or market analysis filtered by a specified content category, billed at $0.05 USDC per call via the x402 protocol.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/prompts/category/%7Bcategory%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-content-broker-prompts-by-category-8ef0a82a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FMXImA9Dyh6k9TUKlJNVv

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-prompts-by-category-8ef0a82a
```

Example prompt: Pull the trading prompts from Wintergreen's x402 content broker in the 'trading' category — I'll pay the $0.05 USDC fee.

## When to prefer this

Choose this endpoint when you need curated, payment-gated AI agent prompts or financial trading datasets organized by category, and you want to pay per-call with USDC via x402 micropayments rather than a subscription. It is especially suited for agents that dynamically fetch prompt packs or market datasets on demand without a long-term data subscription.

## Known failure modes

- 402 Payment Required if the x402 payment header is missing or invalid
- Invalid or unrecognized category returns empty results or 404
- Malformed pack filter string may return no results
- Network timeout on the x402.wintergreen.uk domain
- Payment settlement failure if USDC wallet balance is insufficient

## 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

A collection of AI agent prompts, trading datasets, or market analysis items belonging to the specified category (and optionally filtered by pack name), returned as structured content after a $0.05 USDC x402 micropayment is processed.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-content-broker-prompts-by-category-8ef0a82a/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)