Sterling rose on Tuesday before British lawmakers were scheduled to vote on whether to take a proposal off the table to leave the European Union without a deal, while the US dollar was little changed ahead of a Federal Reserve two-year policy meeting. The euro, yen and other major currencies were locked in narrow trading ranges, with traders reluctant to take big positions due to uncertainty over the U.K. parliamentary vote. There were also clues from the US central bank that it might pause from its current rate-hike campaign.
Investors expect the Fed to adopt a more cautious stance, pressured by signs of a peak in US corporate earnings and the threat of an economic slowdown both at home and globally.
Fed policy makers convene Tuesday and are expected to release a policy statement on Wednesday at 2 p.m. (1900 GMT), followed by a press conference from Fed Chairman Jerome Powell.
"You are not going to see any breakout in currencies at this point," said Mark Heppenstall, chief investment officer at Penn Mutual Asset Management at Horsham, Pennsylvania.
Investors were also jittery after US officials announced criminal charges against China's Huawei Technologies Co. Ltd. for violating US sanctions against Iran. This ratcheted up tensions between Washington and Beijing before trade talks this week.
At 10:01 a.m. (1501 GMT), an index that tracks the dollar against a basket of currencies was little changed at 95.804. It touched a two-week low during the session.
The yuan was steady at 6.753 per dollar, scaling back from Monday when it reached its strongest level since July.
The pound edged up 0.14 percent at $1.3174, hovering below its highest level since mid-October hit last week.
The euro slipped 0.14 percent at 86.715 pence, and little changed at $1.1426.