The yen and euro came under pressure on Thursday, as stock markets edged higher after their worst quarterly performance in four years.
The euro lost ground on Wednesday on data showing euro zone inflation dipped back into negative territory in September.
The yen and Swiss franc were the winners on Tuesday as risk aversion swept global markets, underpinning flows into safe haven currencies.
The dollar rallied after U.S. Federal Reserve Chair Janet Yellen left the door open to a hike in interest rates later this year.
The U.S. dollar extended its decline against the euro on Thursday.
The dollar slipped against the euro on Wednesday after Mario Draghi said the ECB needed more time to assess whether to boost QE.
The dollar hit an almost two-week high after comments from Fed officials revived expectations of a U.S. interest rate hike this year.
The Brazilian real hit a new all-time low on Tuesday after authorities announced a massive austerity package at a time when the economy is shrinking fast.
The U.S. dollar strengthened against a basket of major currencies on the view that the Fed was on track to hike rates this year.
The dollar rebounded from a three-week low on Friday, a day after the Federal Reserve kept U.S. interest rates on hold.
The Fed's inactivity has left no doubt in analysts' minds that other central banks will now look to ease policy further.
The dollar hit session lows against the euro and fell versus the yen following the much-anticipated policy decision by the Federal Reserve.
Aoifinn Devitt, founder and principal at Clontarf Capital, says hedge funds have gradually moved away from currency speculation.
The dollar slid on Wednesday, as a surprise decline in U.S. inflation last month tempered expectations that the Federal Reserve would raise rates.
The dollar rose on Tuesday, as Wall Street rallied on solid retail sales data.
The dollar hit an almost three-week low ahead of this week's Federal Reserve meeting, as investors bet interest rates would be held.
The Swiss Franc has recently defied its decade-long safe haven status.
The dollar was lower on Friday in thin, listless trading ahead of next week's Federal Reserve policymaking meeting.
The dollar softened on Thursday as global stock markets turned down.
The dollar rose on Wednesday, following equities rallies on Wall Street, Europe and Asia.