The US dollar has gained ground against the euro as worries rose about Spanish banks and the eurozone debt crisis as central banks offered little sign of fresh economic stimulus.
"The dollar strengthened against the euro as eurozone uncertainty and diminishing chances of monetary easing drove investors toward the safe-haven greenback," said James Bohnaker at Moody's Analytics.
The euro fetched $1.2514 around 2100 GMT Friday (0700 AEST Saturday) losing ground against the US dollar since the same time on Thursday, when it traded at $1.2561.
The single currency shared by 17 countries fell to 99.49 yen from 100.01 yen.
"The euro endured selling for the entire session, but was able to halve an early loss so that it ended the day about 0.5 per cent lower," Briefing.com analysts said.
"In contrast to recent weeks, action among stocks was less correlated to the euro's movements this week," they added.
US stocks closed on Friday with the best week of the year as rumours circulated that a European Union bailout of Spain could be hatched out this weekend, in case Madrid seeks aid.
The US dollar weakened against the Japanese currency, to 79.49 yen from 79.58 yen late Thursday.
The greenback moved higher against the Swiss currency, trading at 0.9596 francs compared with 0.9561 a day earlier.
It also firmed against the British pound, which fell to $1.5468 from $1.5531.
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