The bullish comments on the U.S. economy, by Fed Vice Chair Richard Clarida, triggered a rebound in U.S. Treasury yields and turned market attention away from the release two hours earlier of an unexpectedly weak private employment report that had driven the dollar down.

The dollar swung from being down 0.3% for the day to up 0.3%on the opposing clues on whether the United States will see strong economic growth and higher interest rates or a serious drag from the coronavirus pandemic.

The ADP National Employment Report was seen as possibly foreshadowing softness in July jobs data due on Friday. But there were doubts about its value as a predictor and another report showed U.S. service industry activity jumping to a record high in July.

The currency markets have been expecting Friday's non-farm payrolls report to be the next big catalyst for exchange rates, followed by comments expected at a symposium of central bankers at the end of this month in Jackson Hole, Wyoming.

In the afternoon in New York, the dollar index against major currencies was up 0.2% to 92.246.

The Japanese yen, often seen as a competing safe haven, was a big beneficiary of the dollar's initial fall on the ADP report and gained to 108.77 per dollar, but couldn't hold its break below 109. The dollar was last trading at 109.45 yen, up 0.4%.

The euro and British pound also swung against the greenback. The euro was last trading at $1.1840, off 0.2% for the day. Sterling was down 0.2% to $1.3889.

The initial downdraft came when the ADP report showed U.S. private payrolls increased about half as much as economists had expected, likely constrained by shortages of workers and raw materials.

"It was a fairly big disappointment," said Mazen Issa, senior currency strategist at TD Securities.

The ADP report has a mixed record of predicting the government report, Issa said, but added, "the miss is substantial enough that the markets may be a little bit more nervous going into Friday's report."

Federal Reserve Chair Jerome Powell and other policy makers have recently emphasized that upcoming employment reports will be critical to the board's decisions about when and how to cut back on support for the economy.

Fed policy maker Robert Kaplan told Reuters on Wednesday that more "progress" in the July and August jobs reports would be reason to start pulling back on bond purchases "soon."

The dollar has lost value in recent weeks as declining yields made strategists question whether the U.S. economy will grow as much as they had expected in light of the spread of the highly contagious Delta variant of COVID-19.

Ether, the second-largest cryptocurrency, rose 7% to $2,690 ahead of an upcoming change in the Ethereum blockchain network that will take some tokens out of circulation.

Bitcoin rose 4% to $39,640.

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Currency bid prices at 3:14PM (1914 GMT)

Description RIC Last U.S. Close Pct Change YTD Pct High Bid Low Bid

Previous Change

Session

Dollar index

92.2460 92.0360 +0.24% 2.517% +92.3110 +91.8140

Euro/Dollar

$1.1840 $1.1865 -0.21% -3.09% +$1.1899 +$1.1833

Dollar/Yen

109.4500 109.0300 +0.39% +5.94% +109.6700 +108.7250

Euro/Yen

129.58 129.35 +0.18% +2.10% +129.8100 +129.1500

Dollar/Swiss

0.9062 0.9041 +0.25% +2.45% +0.9076 +0.9019

Sterling/Dollar

$1.3889 $1.3914 -0.18% +1.67% +$1.3957 +$1.3889

Dollar/Canadian

1.2549 1.2535 +0.12% -1.45% +1.2562 +1.2516

Aussie/Dollar

$0.7381 $0.7393 -0.14% -4.02% +$0.7426 +$0.7370

Euro/Swiss

1.0728 1.0726 +0.02% -0.73% +1.0740 +1.0724

Euro/Sterling

0.8522 0.8529 -0.08% -4.64% +0.8532 +0.8506

NZ

Dollar/Dollar $0.7045 $0.7019 +0.41% -1.86% +$0.7088 +$0.7018

Dollar/Norway

8.8365 8.8215 +0.15% +2.89% +8.8480 +8.7780

Euro/Norway

10.4630 10.4650 -0.02% -0.04% +10.4778 +10.4180

Dollar/Sweden

8.6058 8.5979 -0.15% +4.99% +8.6126 +8.5666

Euro/Sweden

10.1894 10.2049 -0.15% +1.12% +10.2130 +10.1838

(Reporting by David Henry in New York and Iain Withers in London; editing by Kirsten Donovan and Sonya Hepinstall)

By David Henry