Bitcoin price on September 15, 2026: BTC closed at $75,584, down 3.31%, in a $3,355 range between a $78,243 high and a $74,888 low — the largest single-day decline since June 5, on the heaviest volume since September 3, on an afternoon when the Senate’s CLARITY Act cloture vote failed and the close finished $96 above the lower Bollinger Band with the Federal Reserve’s decision one session away. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone who wants them. Informational only. This brief reports market data and publicly READ MORE