In currencies, the dollar index, which tracks the greenback against a basket of six currencies, firmed to trade at 90.671 by 6:49 a.m. HK/SIN, earlier touching a five-week high in the overnight session.
The dollar had firmed after new Federal Reserve Chairman Jerome Powell gave a positive assessment of the U.S. economy on Tuesday and signaled interest rates could rise more than three times this year.
Against the yen, however, the dollar slipped to trade at 106.64, compared to levels around the 107 handle seen at the end of Asian trade in the last session.
On the energy front, U.S. West Texas Intermediate tumbled 2.17 percent to settle at $61.64 per barrel and Brent crude futures for May deliveries fell 2.7 percent to settle at $64.73. The drop in prices came after data reflected an increase in U.S. stockpiles.