# Wintergreen x402 Quant Methodology Pack

> Wintergreen x402 Quant Methodology Pack is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-12).

Delivers payment-gated quantitative trading methodology content (backtesting frameworks, strategy generation, risk management, regime detection) for a specific pack ID via x402 micropayment.

## Facts

- Endpoint: POST https://x402.wintergreen.uk/api/v1/methodology/%7Bpack_id%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-quant-methodology-pack-3c55de8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xZlgvYx8F-59nT9NLQvJH

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-quant-methodology-pack-3c55de8e -d '<json body>'
```

Example prompt: Can you pull the quant methodology pack for walk-forward backtesting and Kelly sizing risk management from Wintergreen — I want the full strategy generation guide including the 19-rule kill battery?

## When to prefer this

Choose this endpoint when an AI agent needs structured quantitative trading methodology content — backtesting frameworks, risk management guidelines, regime detection, or strategy generation rules — and is capable of executing x402 USDC micropayments on Base. Prefer over free alternatives when depth of methodology and structured quant rigor are required.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — requires EIP-712 TransferWithAuthorization and X-PAYMENT header retry
- Invalid pack_id returns 404 or error if the requested methodology pack does not exist
- Payment authorization failure if USDC balance insufficient or signature malformed
- Network timeout if Base chain payment verification is slow
- Incorrect pack_id path parameter results in wrong or no content returned

## 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 document or content pack containing detailed quantitative methodology — which may include walk-forward backtesting procedures, strategy generation logic with 19-rule kill battery, Kelly criterion sizing guidelines, regime detection approaches, and execution/agent orchestration frameworks — delivered after successful USDC micropayment on Base.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-quant-methodology-pack-3c55de8e/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)