The safe-haven yen rose, as investors considered a spectrum of risks including possible U.S. action in Syria and North Korea.
The euro edged lower against the dollar on Monday, pressured by nervousness over the upcoming French presidential elections.
The safe-haven yen climbed and the Russian rouble tumbled on Friday, after the United States launched cruise missiles at an airbase in Syria.
The euro hit a three-week low after the head of the European Central Bank said he saw no need to deviate from the ECB's policy path.
Investors reacted to U.S. economic data and minutes from the U.S. Federal Reserve's March policy meeting.
The yen gained on Tuesday as a risk-averse investors flocked to the safe-haven currency, while Australia's dollar sank to a three-week low.
Investors are looking forward to the U.S. jobs report out on Friday.
The dollar index, which tracks the greenback against six rival currencies, slipped from its late Thursday levels at 100.40.
The dollar edged up to a nine-day high against a basket of currencies on Thursday.
The euro fell to $1.0741 following the report, its lowest since March 21.
Money managers should be ready for "a lot of inefficiency" and currency fluctuations as Prime Minister Theresa May kicks off the official process of the U.K.'s exit from the European Union, a legal expert has told CNBC.
The dollar steadied after its worst week since U.S. President Donald Trump's election in November.
Concerns rose about the prospects of a U.S. public spending boost under President Trump after he failed to push through a health-care bill.
The dollar edged up against the yen on Friday, recovering from its worst run of daily losses versus the safe-haven currency since 2010.
The dollar held under $1.08 per euro for a second day on Thursday as investors awaited a vote on Republican health care plans.
The dollar hit a four-month low against the safe-haven yen on Wednesday.
The euro briefly rose above $1.08 for the first time in six weeks on Tuesday, following a TV debate on the France's presidential elections.
The dollar recovered slightly following reaction to a G20 summit dominated by Trump's protectionist bent extended last week's sales.
The dollar hit five-week lows against its peers on Friday, in the wake of the Federal Reserve's cautious message this week.
The dollar recovered as investors bought the currency on the back of sharp falls prompted by the Fed's failure to give a hawkish message on further rate rises.