Get Volatility Index History

Daily CVI + vol-stress history, up to a year (Pro Plus).

One point per UTC day in [today - days, today]. From 2026-08-24 values come from each day's live archived snapshot. Earlier days are reconstructed from daily klines with the live formula and carry backfilled: true — CVI was only archived from 2026-07-23, and until 2026-08-24 the live universe still counted delisted exchange pairs with frozen prices, which roughly doubled the published index. Reconstructed days use today's coin universe. Today appears once the 20:00 UTC snapshot is built. composite_score is the number /volatility/regime/score serves live, captured once a day.