At current prices, the arithmetic is straightforward. A $757 million net inflow buys about 6,640 BTC, which equates to nearly 15 days of new issuance at the post-halving pace of roughly 450 BTC per day.
The halving last April cut the block subsidy to 3.125 BTC, and with about 144 blocks mined per day, baseline issuance sits near that 450 BTC mark, subject to small fluctuations in block times.
Mined issuance now reflects the 3.125 BTC block subsidy and an average cadence near 144 blocks daily, which places a ceiling on organic supply into ETF demand windows.
That change reduces cash drag and can tighten the arbitrage band, which can influence how quickly primary market demand transmits into spot buying.
A cut would test how much of that demand is rate-sensitive versus structural. One way to frame it is in “days of issuance absorbed per day.” If daily net inflows run at $250 million, $500 million, then $1 billion, the absorption rate spans about 4.9, 9.7, then 19.5 days of issuance per day at a $114,000 price.
A price shift changes the math; the same $757 million would absorb about 16.0 days at $105,000 and about 14.0 days at $120,000, reflecting the fewer coins purchased when prices are higher. That sensitivity is immediate in the primary market, and it will interact with dealer inventories, cross-venue liquidity, and futures basis costs.
Derivatives carry costs remain moderate by 2025’s standards. Aggregated three-month rates across major venues generally cluster in the mid-single digits, a zone that neither adds a large headwind to hedged ETF-related inventory nor invites extreme carry compression.
If a cut pulls funding and basis lower, the relative appeal of unhedged, spot-only exposure inside ETFs can rise in asset allocation models that manage tracking error and gross leverage.
Scenario frame for next week is therefore narrow and testable. If the Fed cuts 25 bps and ETF net inflows migrate into a $500 million to $1 billion daily range for several sessions, the primary market would absorb roughly 10 to 20 days of issuance each day at current prices, which tightens available float unless exchange balances replenish.
If the Fed holds and real yields firm, flows could fade toward flat to $250 million, which implies zero to about five days of issuance absorbed per day, a setting where miner and trader supply can meet demand without visible dislocations.
The in-kind regime, the present basis term structure, and the illiquid supply share all point to how quickly any imbalance would show up in spreads and price impact rather than in a drawn-out squeeze.
For now, the tape offers a simple benchmark. One day, the U.S. spot ETF flow matched nearly two weeks of the new Bitcoin, and the policy decision on Sept. 17 will determine whether that ratio becomes a routine feature or an outlier of a strong week.
