# Kronos Signals Realized Volatility API

> Kronos Signals Realized Volatility API is a paid API for AI agents from kronossignals.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns 7-day, 30-day, and 90-day annualized realized volatility for BTC and 15 other crypto assets using three estimators (close-to-close, Parkinson, Garman-Klass) derived from Binance daily OHLC data.

## Facts

- Endpoint: GET https://kronossignals.com/api/v1/volatility/btc
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kronos-signals-realized-volatility-api-9ac0df72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8oIzYCor0p5vBxuY8TJzw

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 kronos-signals-realized-volatility-api-9ac0df72
```

Example prompt: What are the 7-day, 30-day, and 90-day annualized realized volatility figures for Bitcoin right now, including the Parkinson and Garman-Klass estimates, so I can size my position properly?

## When to prefer this

Use this endpoint when you need multiple realized volatility estimators (not just close-to-close) across multiple lookback windows for a specific crypto asset, especially for options pricing, risk management, or position sizing workflows that require rigorous volatility inputs derived from Binance OHLC data.

## Known failure modes

- Asset not in supported 16-asset list — returns 404 or error
- Payment not provided or invalid x402 payment header — returns 402 Payment Required
- Binance OHLC data unavailable or stale — may return partial or error response
- Malformed asset path parameter — returns 400 Bad Request

## How this service works

Realized volatility for 16 crypto assets (BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/TRX/BCH/ATOM/NEAR/APT): 7-day, 30-day, and 90-day annualized realized vol using three estimators (close-to-close, Parkinson, Garman-Klass) from Binance daily OHLC closed candles only. Essential for risk management, position sizing, and options pricing. Pay-per-call via x402.

## Output

Returns three realized volatility metrics (7-day, 30-day, 90-day annualized) computed via three estimators (close-to-close, Parkinson, Garman-Klass) for the requested crypto asset, based on Binance daily OHLC candle data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kronos-signals-realized-volatility-api-9ac0df72/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kronossignals.com](https://www.zero.xyz/host/kronossignals.com/llms.txt)