# Wintergreen x402 Content Broker

> Wintergreen x402 Content Broker is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Delivers payment-gated crypto trading intelligence, quant methodology guides, market microstructure insights, and niche career/power-market content via x402 micropayment on Base.

## Facts

- Endpoint: POST https://x402.wintergreen.uk/api/v1/tag/%7Btag%7D
- Price: $0.002/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-25237d5f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QnQLL1SeFRToeRDP2EQLf

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-25237d5f -d '<json body>'
```

Example prompt: Pull the Hyperliquid funding divergence signals and liquidation cluster data using the Wintergreen x402 broker — I want the tag for those real-time crypto microstructure observations, and go ahead and authorize the USDC micropayment on Base to unlock them.

## When to prefer this

Choose this endpoint when an AI agent needs on-demand, micropayment-gated crypto trading intelligence (especially Hyperliquid-specific signals), quant methodology guides, or niche domain content (power markets, career guides) without a subscription. Ideal for agents that support x402 payment flows on Base and need pay-per-call access to specialized content not available from free APIs or general knowledge bases.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — agent must sign EIP-712 TransferWithAuthorization and retry
- Invalid or unrecognized tag returns an error or empty response
- Insufficient USDC balance on Base prevents payment authorization
- Stale or replayed payment signature rejected by the broker
- Network latency on Base blockchain delays 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

Returns structured content documents for the requested tag — which may include trading signals (funding divergence, liquidation clusters, lead-lag correlations, session volume levels), quant methodology writeups (backtesting, kill battery rules, Kelly sizing, regime detection), crypto microstructure observations, power market analyses (ERCOT, merit-order, duck curve), or career guides, depending on the tag queried. Access is gated behind a successful EIP-712 USDC payment on Base.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-content-broker-25237d5f/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)