At 8:15 am ET Wednesday, U.S. ADP private sector employment data for April is due.

Ahead of the data, the greenback retreated from its early highs against its major rivals.

The greenback was worth 109.33 against the yen, 1.2008 against the euro, 1.3919 against the pound and 0.9131 against the franc as of 8:10 am ET.