US Spot Bitcoin ETFs See $433M Inflow Led by FBTC
Bitcoin (BTC)
Editor:
Eugene Serbin
According to cvj.ai, U.S. spot Bitcoin ETFs recorded $433.03 million in net inflows on September 18, 2026. This marked the second consecutive day of positive flows, indicating sustained investor demand for regulated exposure. Fidelity’s FBTC fund led the category with $310.72 million in net inflows.
BlackRock’s IBIT also contributed significantly, adding $108.44 million to the total. The combined inflows into FBTC and IBIT accounted for the majority of the day's positive movement. This concentration suggests investors are gravitating toward established products with strong brand recognition.
In a separate category, U.S. spot Ethereum ETFs attracted $144.8 million in net inflows on the same day. The simultaneous positive flows into both asset classes highlight growing institutional appetite. These figures underscore the scale of capital moving into crypto-linked products through regulated vehicles. The back-to-back inflows signal a potential shift in sentiment after a period of volatility.
How the market reacted
Whalio's own Binance spot order flow for BTC, measured when this story was written up on 20 September 2026. Not the outlet's figures.
On Binance spot, Bitcoin is trading at $81,249.99 with a 1-hour buy ratio of 37.9%, indicating immediate selling pressure. However, the 4-hour buy ratio stands at 58.4%, showing that buying interest is building over a slightly longer timeframe. The 24-hour buy ratio sits at 48.2%, suggesting a balanced but slightly bearish short-term trend. Volume delta reflects this mix, with a negative $4,414,879 in the last hour contrasting against a positive $29,194,973 over four hours. Volume delta measures the difference between buy and sell volume, revealing whether aggressive market orders are pushing price up or down. Despite the hourly dip, the cumulative 24-hour volume delta remains positive at $31,820,792.
The latest daily buy ratio of 46.7% sits at the 18th percentile of the last 322 days, against a median of 49.2% - weaker buying than most days.
Was that an ordinary day?
The same Binance spot measurements for BTC, averaged over the days leading up to the story.
Over the preceding week, the 7-day average buy ratio was 52.3%, compared to today's 24-hour reading of 48.2%. This represents a 4.1 point drop from the weekly average, indicating slightly weaker relative buying pressure. Spot volume was also lighter, trading at 0.77 times the weekly average. While six of the past seven days saw net buying, today's metrics suggest a cooling in momentum. The 8-day price change of +5.1% shows recent gains, but the current volume delta of $305,955,034 highlights the scale of activity over that period.