# Wintergreen x402 Crypto Correlation Matrix

> Wintergreen x402 Crypto Correlation Matrix is a paid API for AI agents from x402.wintergreen.uk, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns a payment-gated cross-asset correlation matrix for specified crypto symbols using quantitative microstructure data.

## Facts

- Endpoint: GET https://x402.wintergreen.uk/api/v1/quant/correlation-matrix
- Price: $0.001/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-crypto-correlation-matrix-a71f479a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GvOD9x714SINTHEwWqX_f

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-crypto-correlation-matrix-a71f479a
```

Example prompt: Can you pull the correlation matrix for BTC, ETH, SOL, and ARB so I can see which pairs are moving together and where there might be diversification?

## When to prefer this

Choose this endpoint when you need quantitative cross-asset correlation data for crypto symbols, particularly from Hyperliquid microstructure sources, and you are operating in an x402 micropayment-capable agent environment. Prefer this over generic market data APIs when you need low-cost per-call pricing ($0.001 USDC) and the correlation is specifically needed for quant strategy validation, pairs trading, or portfolio diversification analysis in the crypto domain.

## Known failure modes

- HTTP 402 returned if payment header is missing or malformed — agent must sign EIP-712 TransferWithAuthorization and retry with X-PAYMENT header
- Invalid or unsupported symbol names may return an error or empty matrix
- Empty symbols parameter likely returns a 400 or empty result
- Network latency or endpoint downtime on the x402.wintergreen.uk domain
- Undocumented response schema means parsing failures are possible if structure changes

## 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 correlation matrix showing pairwise statistical correlations between the requested crypto symbols, likely as a JSON object with symbol-keyed coefficients or a nested matrix structure. Exact response schema is undocumented but expected to reflect quantitative cross-asset relationships derived from Hyperliquid microstructure data.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wintergreen-x402-crypto-correlation-matrix-a71f479a/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)