A volume-weighted, market-wide measure of how volatile crypto actually is — the annualized 30-day realized volatility of the whole universe, weighted by trading notional. Paired with BTC & ETH implied vol (Deribit DVOL) and the variance risk premium.
When implied (amber) sits above realized (teal), options are pricing a premium (positive variance risk premium). When realized punches above implied, the market is moving faster than options expected — stress.
Realized vol = annualized 30d Garman-Klass. Percentile = where today's vol ranks in its own trailing 90d range (low = the calm before a move). Vol-target × = the size multiplier a vol-targeting strategy applies. Full universe + per-coin history via the API.
Two lenses on the same risk.
Realized volatility measures how much price has actually moved — computed here from OHLC candles across the whole universe. Implied volatility is baked into options prices and reflects what the market expects next — for crypto that means BTC & ETH (the only coins with deep options), via Deribit's DVOL index.
The gap between them — the variance risk premium (implied − realized) — is a tradable signal. Persistently positive VRP rewards vol sellers; a collapse or flip to negative flags that realized vol is outrunning expectations, which often precedes deleveraging.
curl -H "X-API-Key: cdk_live_yourkey" \ https://cryptodataapi.com/api/v1/volatility/index
Also: per-coin realized vol (/volatility/regime) and implied vol + term structure (/volatility/implied).