Just like USDT Dominance, US Dollar Index (DXY) has a somewhat inverse correlation with Bitcoin's direction. If we look at the DXY historically, whenever the DXY was in a downtrend or sideways movement, Bitcoin was in an uptrend. Also, whenever the DXY was in an uptrend, Bitcoin was in a downtrend. Simply put, if the DXY goes up, that means the U.S. dollar is gaining strength or value when compared to other assets and currencies. So, people/traders tend to hold the U.S. dollar instead of, say, Bitcoin. And when DXY goes down, that means the U.S. dollar is depreciating in value, so people/traders tend to hold other assets like Bitcoin or Gold.