The Fed announced unlimited quantitative easing and programmes to support credit markets on Monday in a drastic bid to backstop an economy reeling from emergency restrictions on commerce to fight the coronavirus.
Against a basket of its rivals, the dollar fell 0.5pc to 101.52, down more than 1pc from Monday's highs and having hit a more than three-year high of 102.99 on Friday.
"The dollar funding conditions are easing slightly compared with a week ago, though I wouldn't say things are normal. While the Fed is pumping dollars, we still need to wait and see if that money will flow to every corner of the economy," said Koichi Kobayashi, chief manager of forex at Mitsubishi Trust Bank.
While the Fed's latest measures were seen to have effectively broken the spreading freeze in the dollar funding markets in the short-term, the shock to the real economy is expected to last for a far longer period with latest PMI data offering a glimpse of the pain.
Japan posted its biggest ever services sector decline and factory activity shrank at its fastest in a decade, consistent with a 4pc economic contraction this year. The picture in Australia was similar.
Ulrich Leuchtmann, head of FX and commodity research at Commerzbank said in a note that as more economies enact draconian measures to lock down their economies, the global economy would be massively constrained in the near future and markets could quickly turn back into risk-off mode. But in early London trading, battered currencies rallied.
The euro gained 1pc to $1.0834, bouncing back from a near three-year low of $1.0636 in the previous session. The British pound also rose 0.9pc to $1.1650, up more than two cents from its 35-year low of $1.1413 set last week.
The Fed announced various programmes including purchases of corporate bonds, guarantees for direct loans to companies and a plan to get credit to small and medium-sized business.
Trading remained volatile, with the Australian dollar rising 2.0pc to $0.5952, extending its recovery from a 17-year low of $0.5510 touched last week.