BTC: 30-Day Implied Volatility Index by Coin
Shown as its 3 Oct – 1 Nov 2026 sample; the latest readings and full history are included with Plus.
Our own 30-day implied-volatility index for bitcoin, ether, SOL, XRP, HYPE, AVAX and TRX, on one chart.
Why use it. Shows which coins the option market thinks will move most, and how the gaps between them shift. How to read it. Each line is one coin's annualised expected volatility for the next 30 days. A coin rising against the others is being priced for more risk.
Calculation. Model-free 30-day implied volatility, the method behind the VIX, computed by us from our ten-minute snapshots of Deribit's option chains: for the two expiries around 30 days, the out-of-the-money marks in USD summed over the listed strikes (each weighted by the strike spacing over the strike squared), then interpolated in total variance to exactly 30 days. An hourly value needs at least 8 usable strikes on both expiries; a coin whose chain is too thin at that hour has none. From 14 October 2026 13:00 UTC for bitcoin and ether and 17 October 2026 for the other coins, when our snapshots of those chains begin. Over that period the bitcoin and ether readings have run a median of 1.5 to 2 points above Deribit's own DVOL index, which uses a different construction.