# Wintergreen Kill Battery Field Guide

> Wintergreen Kill Battery Field Guide 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).

Returns the kill battery field guide — a 19-rule strategy kill checklist for quant trading systems — behind a $2.50 USDC micropayment gate via x402 protocol.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/knowledge/kill-battery-field-guide
- 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-kill-battery-field-guide-430d6fe9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0Z9ickfY47Gj4c0pSJKZt

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-kill-battery-field-guide-430d6fe9
```

Example prompt: Can you fetch the kill battery field guide from Wintergreen — the 19-rule strategy kill checklist — and pay the $2.50 USDC fee to unlock it?

## When to prefer this

Choose this endpoint when an AI agent needs authoritative, structured kill battery criteria for quant strategy validation and is capable of executing x402 micropayments in USDC on Base. Prefer over free or scraped alternatives when you need curated, maintained rule sets with provenance. Best suited for agents embedded in trading pipelines that already handle EIP-712 payment flows.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — must sign EIP-712 TransferWithAuthorization and retry
- Incorrect file_slug or route_slug returns empty or wrong content
- Payment to wrong address or wrong chain (must be Base / eip155:8453) causes transaction failure
- Stale or replayed payment authorization rejected by broker
- Network timeout on Base chain 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

A structured field guide detailing 19 kill battery rules used to invalidate or shut down quantitative trading strategies, covering criteria such as drawdown thresholds, regime mismatches, execution failures, and risk violations. Returned as content payload after successful USDC payment via x402.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "_file_slug": {
   "type": "string"
  },
  "_route_slug": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-kill-battery-field-guide-430d6fe9/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)