The U.S. dollar held steady near a four-week high on Tuesday, with the dollar index hovering around 101.50, as traders assessed the possibility of a Federal Reserve interest rate hike this week. Markets are pricing in a nearly 40% chance of a 25-basis-point rate increase at the Fed's policy meeting conclusion on Wednesday, up from about 20% a week ago, and almost a 95% probability of a hike by September. This reflects a significant repricing of Fed expectations, driven by rising Treasury yields and concerns over inflation. Meanwhile, Bitcoin fell 2.3% to $63,414.16, and Ether declined 3.4% to $1,879.71.