# Carbon & Cashmere Volatility API – SOL

> Carbon & Cashmere Volatility API – SOL is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns multi-timeframe realized volatility, range-based volatility estimators, downside risk, and vol-of-vol metrics for Solana (SOL).

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/volatility/SOL
- Price: $0.01/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-volatility-api-sol-5a5927c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__UmjP_aczPxdfKsIAJvJJ

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-volatility-api-sol-5a5927c4
```

Example prompt: What's SOL's current volatility profile — give me the Parkinson, Garman-Klass, 7-day and 30-day realized vol, and the vol-of-vol so I can gauge how risky it is right now?

## When to prefer this

Choose this endpoint when you need quantitative volatility metrics specifically for SOL/Solana, including professional-grade estimators like Parkinson and Garman-Klass that go beyond simple standard deviation, plus multi-timeframe realized vol and downside risk. Prefer over generic price APIs when risk quantification or volatility regime analysis is the goal.

## Known failure modes

- Invalid or unsupported symbol in path returns an error
- Payment not included or invalid x402 payment header results in 402 Payment Required
- Network or upstream data unavailability may return a 503
- Rate limiting if call volume exceeds plan thresholds

## How this service works

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

## Output

A JSON object containing: Parkinson and Garman-Klass range-based volatility estimates, realized volatility for 7-day, 30-day, and full-period windows, 30-day downside volatility, and 30-day vol-of-vol for SOL, plus an informational disclaimer.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "_meta": {
   "disclaimer": "Informational research data only — not investment advice."
  },
  "symbol": "BTC",
  "range_based": {
   "parkinson": 0.41,
   "garman_klass": 0.4
  },
  "downside_30d": 0.28,
  "realized_vol": {
   "7d": 0.32,
   "30d": 0.38,
   "full_period": 0.42
  },
  "vol_of_vol_30d": 0.09
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-volatility-api-sol-5a5927c4/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)