# Wintergreen x402 Content Broker – Prompt Retrieval

> Wintergreen x402 Content Broker – Prompt Retrieval 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).

Fetches a specific payment-gated AI agent prompt, trading dataset, or market analysis item by prompt ID, charging $0.02 USDC per retrieval via the x402 payment protocol.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/prompts/%7Bprompt_id%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-prompt-retrieval-2bb5abe7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KzMTy7x7_loHgbKpPk-EF

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-prompt-retrieval-2bb5abe7
```

Example prompt: Fetch the Wintergreen prompt with ID 'trend-reversal-v2' — I want to use the premium trading strategy prompt and pay the $0.02 USDC fee.

## When to prefer this

Choose this endpoint when you need to programmatically retrieve a specific AI agent prompt, trading signal dataset, or market analysis item from Wintergreen's paid content catalog using a known prompt_id. Prefer this over generic content APIs when you want USDC micropayment-gated access to curated trading and AI agent content, and you already know the content identifier you want.

## Known failure modes

- 402 Payment Required if USDC payment fails or wallet is underfunded
- 404 Not Found if the prompt_id does not exist
- Invalid prompt_id returns an error or empty response
- Payment protocol mismatch if x402 headers are not correctly formed
- Rate limiting or access denial if the endpoint is overloaded

## 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 the full content of the requested prompt, trading dataset, or market analysis item associated with the given prompt_id (and optional pack parameter), delivered after successful USDC micropayment via x402. Response schema is unstructured and may vary by content type.

## 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-prompt-retrieval-2bb5abe7/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)