The Eurodollar edged lower after the Fed held interest rates at 4.5% midweek as a cautious Fed continued to point to inflation concerns.
The British pound declined as weaker data suggested that the Bank of England could soon have to consider another rate cut.
The USD/JPY pair climbed to a three-week high after the unfolding conflict in the Middle East caused traders to back the dollar as the safe-haven currency of choice.
Gold prices pulled back after President Trump outlined that a decision on whether the US will join Israel in striking Iranian nuclear facilities will be taken within two weeks. The US said this would give a last chance for a diplomatic resolution.
U.S. stock prices traded lower after the Fed decision, after President Trump criticized Fed Chair Powell for delaying rate cuts, which he said was costing the US economy hundreds of billions of dollars.
Oil prices climbed on expectations that the Israel–Iran conflict will escalate, with the US close to a decision on whether to strike oil-rich Iran.