The euro held firm on Wednesday in choppy trading as investors awaited an European Central Bank meeting.
Weak Chinese trade data stoked safe-haven demand for the yen on Tuesday.
The dollar index fell as big gains in oil prices rekindled demand for the euro and commodity-sensitive currencies.
The dollar hit one-week lows against the euro and fell against the yen after a drop in U.S. wages in February overshadowed strong jobs growth.
The U.S. dollar was set to post its biggest one-day percentage decline against the euro in more than three weeks.
The U.S. dollar dipped against the yen on Wednesday on concerns over U.S. economic growth but hit a more than one-month high against the euro.
The U.S. dollar rebounded against the yen and hit one-month highs against the euro on Tuesday.
The yen rose broadly on Monday as investors sought its safety following a statement from the Group of 20 countries.
John Chambers, Standard & Poor's, discusses how a U.K. exit from the European Union would likely impact Britain's credit rating, Europe and the U.S.
The dollar gained after generally upbeat U.S. data revived some expectations that the Fed could consider raising interest rates again this year.
The U.K. pound is set to end the week down more than 3 percent from when U.K. Prime Minister David Cameron set June 23 for the so-called Brexit referendum.
Gains in European stocks helped sterling and the dollar climb against safe-haven currencies like the yen on Thursday.
Richard Cochinos, Citi, shares his thoughts on the currency markets and how a U.K. exit from the E.U. will likely impact the European economy.
Sterling tumbled to a seven-year low on Wednesday on heightened fears of a possible British exit from the European Union.
The Futures Now team discusses Brexit fears and how the British pound hit a 7-year low.
CNBC's Rick Santelli discusses the latest action in the bond market, and the U.S. dollar against the British pound.
Former Dallas Fed Advisor Danielle DiMartino Booth, weighs in on the impact of negative rates on economic growth and explains why the correlation between dropping oil prices and sagging stocks makes sense to her. Also Booth provides her outlook on the British pound.
The yen and Swiss franc rallied across the board on Tuesday as a recent rebound in stocks and crude oil faded.
Currency traders have been circling exchange rates this week, with expectations high that political divisions could lead to further opportunities.
The dollar rose to a three-week high, bolstered by gains in oil and stocks as well as losses in sterling and euro.