Dollar Down Vs. Euro PowerShares DB U.S. Dollar Index Bullish ( UUP ), measuring the greenback against a basket of major foreign currencies, gapped down 1.02% to 21.80. Shutterstock photo Gold and silver prices brightened Thursday as the dollar fizzled against the euro after the European Central Bank kept its key interest rate the same. "He stated that inflationary pressures remained contained and also cited other factors including strong capital inflows into the euro area and a rise in deposits at banks in periphery countries that indicate potential growth in the second half."