Bitcoin’s Weekend Gap: ETFs Shift Liquidity to U.S. Hours

The rise of spot Bitcoin ETFs has introduced a new structural feature to the cryptocurrency market: temporal fragmentation of liquidity. While ETFs provide massive, regulated trading volumes during U.S. market hours, crypto continues to trade 24/7, creating a divergence between ETF-driven price discovery and off-hours, crypto-native liquidity.

As crypto market data provider Kaiko reports, BlackRock’s iShares Bitcoin Trust (IBIT) now trades $16–18 billion daily, roughly matching Binance and more than doubling Coinbase’s $6–8 billion volume. 

The top three Bitcoin ETFs collectively hold more than $73 billion, accounting for 80.6% of total U.S. spot Bitcoin ETF assets.

U.S. trading sessions now account for 47% of global Bitcoin spot volume, up from 38% before the ETF launch.

Bitcoin trading is increasingly concentrated during U.S. market hours, redirecting significant activity from other times. Over $50 billion in monthly volume has moved into these sessions, reflecting a structural shift in liquidity.

Monthly trading during U.S. hours has climbed from around $77 billion in late 2023 to roughly $105 billion in 2025. Data from Kaiko show that patterns once spread across the 24-hour global market now align more closely with traditional U.S. market schedules.

This concentration, however, creates a gap on weekends. When U.S.-based ETFs are inactive, most trading occurs on crypto-native exchanges, which tend to have thinner order books and wider bid‑ask spreads, meaning even moderately sized orders can move prices more than during weekday sessions.

The impact is visible in the numbers. The average BTC–USDT bid‑ask spread more than doubles on weekends, widening from 0.012% on weekdays to 0.028%. Trading volumes also fall, with total BTC activity dropping roughly 20–40% compared with weekday levels.

According to Amberdata, analysis of over 50,000 minutes of BTC/FDUSD order book data on Binance in mid‑2025 showed that Bitcoin liquidity follows clear daily rhythms. 

Liquidity peaks around 11:00 UTC, when Asian, European, and U.S. markets overlap, and then drops sharply by 21:00 UTC, about 42% lower. These patterns persist even during sharp price movements, reflecting structural trading cycles rather than short-term volatility.

Thinner liquidity doesn’t just affect small traders. Even modest trades by large investors can move the market more on weekends than during busy weekday hours.

However, the concentration of liquidity within these limited trading hours introduces a weekend gap. On Saturdays and Sundays, when U.S.-based ETFs are closed, the bulk of trading relies on crypto-native exchanges, which typically have thinner order books and higher spreads. 

This divergence can lead to volatility spikes and temporary dislocations between ETF net asset value (NAV) and spot Bitcoin prices.

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