On Thursday, the pound rose to a fresh six-month high against the dollar after an opinion poll in the UK has shown the supporters of maintaining the EU membership surpass the Brexit supporters.
GBP/USD pair rose to 1.4943, a peak from December 24, showing a 2% jump for the day.
An opinion poll carried out by Ipsos MORI for the newspaper Evening Standard, has shown that the number of Brexit opponents of the EU is 52% compared with 48% of supporters.
Sterling jumped on Wednesday evening after a public opinion poll showed the majority is with those who want to stay in the European Union.
YouGov poll for the Times newspaper showed that 51% of voters support the campaign to stay in the EU, with a 49% figure for Brexit supporters, after the previous YouGov poll showed a numerical advantage for the exit supporters.
The second survey, conducted by ComRes for the Daily Mail newspaper and television channel ITV (LON: ITV), showed the advantage of UK Brexit opponents - 48% against 42%.
Investors fear that the exit from the EU would be a shock for the world's stocks, bonds and currencies, and in particular for the pound, which, according to the predictions of some analysts, may fall by 15%.
Reuters reported on Thursday that the G7 financial leaders are going to make a statement, which underlines the readiness to take all necessary measures to calm markets in the event of Britain exit.
The Standard and Poor's rating agency said on Thursday that the credit rating of the UK will soon be reduced if the country will vote for the exit from the EU.
Sterling is traded near three-week highs against the euro: EUR/GBP pair fell 0.61% to 0.7627.
Euro registered a growth against the dollar: EUR/USD strengthened by 0.87% to 1.1391.
The dollar strengthened against asylum-yen, the USD/JPY pair rose 1.24% to 105.67, retreating from a two-year low at 103.53 reached last Thursday.
USD Index, which tracks the greenback against a trade-weighted basket of six major rivals, was down 0.68% to 93.17.