# Carbon & Cashmere Rolling Correlation API – ETH/SOL

> Carbon & Cashmere Rolling Correlation API – ETH/SOL is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns the rolling 30-day Pearson correlation between ETH and SOL prices, with regime classification, percentile rank, and statistical summary over a 90-day lookback.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/rolling-correlation/ETH-SOL
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-rolling-correlation-api-eth-sol-ffac3c97
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BShuZt6MaEpDUbRngAemB

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 carbon-cashmere-rolling-correlation-api-eth-sol-ffac3c97
```

Example prompt: What's the current 30-day rolling correlation between ETH and SOL — is it in a strongly positive regime and where does it sit in the 90-day historical percentile range?

## When to prefer this

Use this endpoint when you need a statistically grounded, pre-computed rolling correlation for the ETH-SOL pair with regime and percentile context — especially useful for portfolio risk assessment, pairs trading signals, or diversification checks. Prefer this over building your own correlation from raw price feeds when you need regime classification and historical percentile context in a single call.

## Known failure modes

- Unsupported pair slug in the URL path returns a 404 or empty result
- Downstream price data feed outage may yield stale or missing data_points
- Malformed query parameters produce a 400 validation error
- Payment failure (insufficient USDC balance) results in a 402 response blocking the call

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

A JSON object containing the current Pearson correlation value between ETH and SOL (e.g. 0.82), the regime label (e.g. 'strongly_positive'), trend direction (e.g. 'stable'), the percentile rank within the 90-day lookback, mean and standard deviation of correlation over that lookback, the number of data points, and a disclaimer that the data is for research purposes only.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "base": "BTC",
  "pair": "BTC-ETH",
  "_meta": {
   "disclaimer": "Informational research data only — not investment advice."
  },
  "quote": "ETH",
  "trend": "stable",
  "regime": "strongly_positive",
  "statistics": {
   "std_over_lookback": 0.08,
   "current_percentile": 0.68,
   "mean_over_lookback": 0.78
  },
  "data_points": 540,
  "window_days": 30,
  "lookback_days": 90,
  "current_correlation": 0.82
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-rolling-correlation-api-eth-sol-ffac3c97/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)