# Carbon & Cashmere GARCH Volatility Forecast — ETH

> Carbon & Cashmere GARCH Volatility Forecast — ETH 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 GARCH-model volatility forecasts, parameters, and half-life estimates for Ethereum (ETH)

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/garch/ETH
- 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-garch-volatility-forecast-eth-e7a90a06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8BHZBYsitpq_6AqniRoOU

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-garch-volatility-forecast-eth-e7a90a06
```

Example prompt: What's Ethereum's current GARCH volatility forecast — I want the annualized conditional vol right now, the 1-day, 7-day, and 30-day forecasts, the persistence level, and how many days until volatility reverts to its mean?

## When to prefer this

Use this endpoint when you need quantitative, model-based volatility estimates for ETH specifically — especially when you need GARCH parameters, persistence metrics, or a half-life for mean-reversion timing. Prefer this over simple price endpoints when your use case involves risk modeling, options pricing intuition, or assessing whether current volatility is elevated relative to long-run levels.

## Known failure modes

- Invalid or unsupported symbol returns an error
- Payment not included or insufficient (x402 payment required, $0.05 USDC)
- Service temporarily unavailable or model not yet computed for current period
- Rate limit exceeded for repeated rapid calls

## How this service works

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

## Output

A JSON object containing: current annualized conditional volatility, short-term volatility forecasts at 1d/7d/30d horizons, fitted GARCH parameters (omega, alpha_1, beta_1, persistence), and the estimated half-life in days for volatility to mean-revert. Includes a research 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",
  "forecast": {
   "1d": 0.41,
   "7d": 0.43,
   "30d": 0.45
  },
  "parameters": {
   "omega": 0.001,
   "beta_1": 0.89,
   "alpha_1": 0.08,
   "persistence_alpha_plus_beta": 0.97
  },
  "half_life_days": 4.2,
  "conditional_vol_now_annualized": 0.42
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-garch-volatility-forecast-eth-e7a90a06/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)