BTC 1-hour closes up 0.73%: Large net inflow into spot ETFs boosts short-term buying

On April 21, 2026, from 20:00 to 21:00 (UTC), the price of BTC increased by 0.73%, trading between 74,970.6 and 75,609.1 USDT, with an amplitude of 0.85%.
Overall market volatility intensified, but buying pressure remained dominant.

The main driver of this movement was a large net inflow of spot Bitcoin ETF funds.
Data shows that on April 21, the mainstream spot Bitcoin ETFs experienced a single-day net inflow of $471.3 million, the highest since February 25, directly strengthening spot market buying demand and causing a short-term rise in BTC price.

Additionally, on-chain capital metrics show multiple supports.
BTC and stablecoins experienced synchronized net inflows into exchanges, reflecting abundant market funds and good liquidity.
The number of active addresses on the network remained high, with daily trading volume exceeding $2 billion, indicating healthy real demand.
The derivatives market’s open interest stayed above $20 billion, with positive funding rates and stable bullish sentiment, providing support for spot prices.
On a macro level, the US dollar index showed limited volatility, with no major external negative factors, and market risk appetite remained unrestrained.

In terms of risks, attention should be paid to the sustainability of ETF fund inflows.
If subsequent net inflows slow down, the market may experience a correction.
If on-chain BTC inflows into exchanges are not effectively absorbed, they could turn into selling pressure.
Although leverage levels in the derivatives market are not yet out of control, vigilance is needed regarding the potential chain reaction caused by negative funding rates.
Investors should monitor ETF net inflow trends, changes in exchange BTC flow, and macro news to guard against short-term volatility risks.