In October, the Premium Currency Base Index never showed positive dynamics. This is the most negative index since June. *Coinbase Premium Index measures the premium/discount at which BTC trades in a coinbase compared to other exchanges US buyers took a wait-and-see approach, and BTC fell 4% in price during the month. So far, so far disappointing. The closest drivers are the FOMC meeting and the midterm elections. —. CryptoQuant.