# Wintergreen x402 Quant Methodology Bundle

> Wintergreen x402 Quant Methodology Bundle is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Delivers a gated bundle of quantitative crypto trading methodology content including backtesting frameworks, strategy generation with kill-switch rules, Kelly sizing, and regime detection — paid via x402 USDC micropayment on Base.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/methodology/bundle
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-quant-methodology-bundle-517e8acd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JaGbu3ssdg9QRYxpnFA9_

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-bundle-517e8acd
```

Example prompt: Can you pull the full quant methodology bundle from Wintergreen — I need the walk-forward backtesting guide, the kill-battery strategy rules, and the Kelly sizing framework for my crypto trading system?

## When to prefer this

Choose this endpoint when an AI agent or quant developer needs a self-contained, authoritative methodology bundle covering the full lifecycle of crypto strategy development — from backtesting validation to live execution and agent orchestration — and is willing to pay $15 USDC per retrieval. Prefer this over free resources when reproducibility, structured rule sets (kill battery), and agent-ready frameworks are required. Not suitable for real-time signal streaming or live market data lookups.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — must sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header
- Payment to wrong address or wrong chain (must be USDC on Base eip155:8453) causes payment failure
- Malformed X-PAYMENT header results in rejection
- Service unavailability or upstream content errors return 5xx
- Incorrect format parameter value may result in unexpected response structure

## 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 bundle covering: walk-forward backtesting validation, strategy generation with a 19-rule kill battery, Kelly-based risk management sizing, regime detection methods, execution frameworks, and agent orchestration guidance — returned as JSON or formatted text after successful USDC micropayment on Base.

## 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-quant-methodology-bundle-517e8acd/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)