Bitcoin ETF outflows erase Monday's rebound as selling deepens ahead of Fed decision
ETF investors pulled $450 million as the Fed meeting began
US spot Bitcoin exchange-traded funds — funds that track Bitcoin's price and trade like shares — recorded a net outflow of $450.4 million on Sept. 15, according to flow data cited by CryptoSlate. That wiped out the previous session's $159.9 million inflow.
The reversal came as the Federal Reserve began a two-day policy meeting, and it removed a brief demand signal that had appeared heading into that meeting. The six completed trading sessions since Sept. 8 added up to a net withdrawal of $753 million.
Key numbers
- US spot Bitcoin ETF net outflow on Sept. 15: $450.4 million.
- Prior session inflow: $159.9 million, fully erased.
- Net ETF withdrawal across six sessions since Sept. 8: $753 million.
- Bitcoin traded near $75,900 at press time, near the lower end of its recent range.
What Glassnode's Week 38 report shows
Glassnode, a blockchain analytics firm, reported that spot cumulative volume delta — a measure of aggressive buying minus aggressive selling on exchanges — reached negative $142 million. That sat below its negative $115 million lower statistical band, indicating sellers dominated exchange activity in the firm's dataset.
Sellers were also aggressive in derivatives. Perpetual cumulative volume delta, which tracks the same buying-versus-selling balance in perpetual futures contracts, fell to negative $605 million — far below its negative $233 million lower band.
Leverage stayed high despite the pressure. Futures open interest, the total value of outstanding derivative contracts, eased from about $37 billion to roughly $36 billion but remained above its $36 billion upper statistical band. The report's summary listed open interest at $36.4 billion. Long-side funding payments — recurring transfers between traders betting on higher prices and those betting on lower ones — rose to $1.4 million while staying within their normal range.
What the ETF numbers can and cannot tell us
The ETF flow dataset, sourced from Farside, measures creations and redemptions across the funds. It does not identify who the investors are or whether they sold Bitcoin directly. The narrower conclusion supported by the data is that the ETF reversal arrived alongside broader sell-side pressure across exchanges.
What is confirmed
Confirmed: the Sept. 15 ETF outflow figure, the erased inflow, the six-session net withdrawal, and the Glassnode readings for spot, perpetual, open interest, and funding. The Federal Reserve's policy decision was still pending at the time of reporting.
What is still unclear
Glassnode's snapshot predates the Sept. 15 ETF flow data, so the two datasets cover slightly different windows. The article notes that any causal link between ETF redemptions and exchange selling remains unresolved — the numbers show both happened, not that one caused the other.
Why this matters for Bitcoin's next move
The combination of deepening spot selling, aggressive derivatives selling, and still-large futures positioning leaves the market vulnerable, in CryptoSlate's framing, rather than broken. High open interest means there is enough positioning to amplify the next price shock, while normal funding levels argue against an already extreme imbalance toward traders betting on higher prices.
What happens next
Bitcoin's first test after the Fed decision was still ahead at the time of reporting. The article describes a constructive response as price stabilization paired with improving spot flow and orderly open interest. A more convincing bearish move, it adds, would combine renewed spot selling with a sharper fall in open interest and a funding reset — evidence that pressure had spread into forced deleveraging.