# Wintergreen x402 Quant Regime Detection

> Wintergreen x402 Quant Regime Detection is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).

Returns a market regime classification for a given crypto symbol, gated behind a $0.001 USDC micropayment via x402 protocol.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/quant/regime?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wintergreen-x402-quant-regime-detection-d97fa475
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eo79owi5o47jeLRctgm8c

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-regime-detection-d97fa475
```

Example prompt: What's the current quant market regime for BTC? Pay the micropayment if needed and tell me whether we're in a trending, ranging, or risk-off state.

## When to prefer this

Choose this endpoint when you need a quantitative market regime label for a specific crypto symbol in real time, especially when building regime-aware trading strategies on Hyperliquid or similar venues. Prefer it over general sentiment or price APIs when you need a structured quant classification (trending/ranging/volatility state) grounded in microstructure signals. Best suited for AI agents capable of handling x402 micropayment flows on Base.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — must sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header
- Invalid or unsupported symbol returns an error or empty response
- Network timeout if Base blockchain authorization is slow
- Malformed payment signature causes rejection
- No response schema documented — output structure may be opaque to agents without prior calls

## 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 regime classification for the requested crypto symbol, likely including the current market state label (e.g. trending, ranging, risk-on/off, high/low volatility) and potentially supporting metadata such as confidence or regime scores. Response is only returned after successful USDC micropayment via x402.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "symbol": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-quant-regime-detection-d97fa475/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)