The U.S. dollar gained for a third straight session on Wednesday against the euro and sterling as traders awaited the Federal Reserve's annual Jackson Hole symposium this week for clues on the monetary policy path.

The stock market is heading into a catalyst-filled week as Fed Chair Jerome Powell gets ready to speak at Jackson Hole and big retailers report earnings.

Shares in Asia fell on Wednesday, weighed down by a tech-led selloff on Wall Street, while the dollar gained some ground ahead of a key meeting of central bankers later in the week.

The crypto market decline deepened as Bitcoin, Ether, and XRP dropped ahead of Fed Chair Powell's Jackson Hole speech and policy cues.