# Wintergreen x402 Content Broker

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

Delivers payment-gated trading intelligence and research content (crypto signals, quant methodology, market microstructure, power markets, career guides) for a specified category, requiring $0.25 USDC per call via x402 protocol.

## Facts

- Endpoint: POST https://x402.wintergreen.uk/api/v1/insights/category/%7Bcategory%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-content-broker-da3ea06a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lzFlIQstwH9-1j6lh6dau

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-da3ea06a -d '<json body>'
```

Example prompt: Pull the Hyperliquid signals category from Wintergreen — I need the latest funding divergence and liquidation cluster data, and go ahead and authorize the $0.25 USDC payment on Base to unlock it.

## When to prefer this

Choose this endpoint when an AI agent needs structured trading intelligence, quant methodology, or niche research content gated behind a micropayment, particularly for Hyperliquid-specific signals or crypto microstructure data not available via free APIs. Best suited for agents capable of autonomously handling x402 micropayments in USDC on Base.

## Known failure modes

- HTTP 402 returned if no valid X-PAYMENT header is provided — agent must sign EIP-712 TransferWithAuthorization and retry
- Invalid or expired payment authorization results in rejection
- Unsupported category value returns an error
- Insufficient USDC balance causes payment failure
- Network issues on Base blockchain may delay payment confirmation

## 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 structured content payload for the requested category, which may include trading signals (funding divergence, liquidation clusters, volume area levels), quantitative methodology documents, crypto microstructure observations, power market analysis, or career guide content, depending on the category specified. Access is granted only after successful EIP-712 USDC payment authorization on Base.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-content-broker-da3ea06a/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)