# Wintergreen x402 Prompt Pack Retrieval

> Wintergreen x402 Prompt Pack Retrieval is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Retrieves a payment-gated pack of AI agent prompts, trading datasets, or market analysis content by category via USDC micropayment

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/prompts/pack
- Price: $0.01/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-prompt-pack-retrieval-952824b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PWCo7evpBpdT08Cmksr87

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-prompt-pack-retrieval-952824b5
```

Example prompt: Fetch me the 'trading-strategies' prompt pack from Wintergreen's x402 broker — I want the market analysis category, and I'm fine paying 0.10 USDC for it.

## When to prefer this

Choose this endpoint when you need pre-curated, payment-gated AI agent prompts or trading/market analysis datasets and are willing to pay a small USDC micropayment per access. It is especially useful for agents that need high-quality, structured prompt packs for financial or trading workflows without building their own prompt libraries. Prefer this over free or open prompt repositories when quality-gating and micropayment-based access control are acceptable.

## Known failure modes

- Payment rejected or insufficient USDC balance — returns 402 Payment Required
- Invalid or unknown pack identifier — may return empty or error response
- Invalid category value — may return no results or an error
- Network timeout or service unavailability — generic 5xx error
- Malformed request parameters — 400 Bad Request

## 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 pack of curated content — which may include AI agent prompts, trading datasets, or market analysis materials — corresponding to the requested pack name and category. The response schema is open-ended, so the exact structure of returned content (e.g. JSON objects, prompt strings, dataset records) depends on the specific pack requested.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "format": {
   "enum": [
    "json"
   ],
   "type": "string",
   "description": "Optional response format hint (json). No required inputs."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-prompt-pack-retrieval-952824b5/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)