BTC shows a signal unseen for 90 days: has U.S. buying pressure really disappeared?
On August 16, the Coinbase Bitcoin Premium Index stayed negative for 90 straight days, setting the longest record in history, currently at about -0.1066%.
The number itself is small, but the duration is extremely unusual.
Coinbase prices have long been below Binance, which suggests that onshore U.S. exchange spot buying has remained weaker than the offshore market. During the same period, BTC fell from around $76,750 on May 19 to about $63,000 now, a cumulative drawdown of roughly 18%.
But there’s an easy-to-misread point here:
A negative Coinbase premium ≠ a full exit by U.S. institutions.
From August 3 to 7, U.S. spot BTC ETFs actually saw net inflows of about $850 million; then on the 13th and 14th, there were net outflows of about $131 million and $56.2 million, respectively.
What may be happening instead is not that “U.S. capital has vanished,” but that U.S. BTC demand is shifting from direct spot trading on Coinbase to regulated channels such as ETFs and the CME.
So what I care about next isn’t whether BTC can rebound by $1,000, but whether two signals can appear at the same time:
Coinbase premium turning positive again + ETFs resuming sustained net inflows.
Only if both align can it indicate that the marginal U.S. buyer has truly returned.
A 90-day negative premium isn’t proof that the bull market is dead, but it is reminding us that the old market structure—“when Coinbase has a premium, BTC takes off”—is changing.
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