Bitcoin's Volatility Clock Ticks in Sync with Wall Street

A decade-long study of Bitcoin's price action reveals that its volatility has increasingly synchronized with Wall Street's schedule. The research, based on hourly observations from Kraken's XBT/USD market between 2016 and 2025, found that the nine hours from 13:00 to 21:59 UTC accounted for 50.6% of Bitcoin's daily realized variance.

This represents a significant increase from 38.4% in 2016-2018, suggesting price discovery has become more concentrated during this period. The study also found that Bitcoin's volatility peak moves when New York changes its clocks and fades when the New York Stock Exchange closes.

The researchers used US daylight-saving transitions to distinguish Wall Street's influence from activity that simply occurs during similar hours. They found that during 2022-2025, Bitcoin's most volatile hour moved from 14:00 UTC during US daylight-saving time to 15:00 UTC during standard time, moving with the shift in the American trading session.

The study also tested the hypothesis that the introduction of US spot ETFs in January 2024 transformed the market. However, a statistical change-point analysis identified November 2021 as the single major break in Bitcoin's US-hours volatility trend.