Bitcoin slipped 1.1% to $76,919.8, breaking below $77,000 as risk appetite waned.
Brent crude rose near $110 per barrel due to Strait of Hormuz tensions, stoking inflation fears and pressuring risk assets.
Central banks in focus as BOJ kept rates steady while markets await Fed, ECB and BoE policy decisions later this week.
Altcoins slipped, with Ethereum down 1.6% to $2,285.44, XRP 1.8% to $1.39; Dogecoin rose 2%.