Asian shares rallied on Wednesday as markets scaled back expectations for how fast and how far US interest rates might rise this year, bruising the dollar and boosting sovereign bonds.

MSCI’s broadest index of Asia-Pacific shares outside Japan reversed four sessions of losses to jump 1.3 per cent. South Korea hit its highest for the year so far, while Shanghai bounced 1.4 per cent.

Japan’s Nikkei was the only loser as a rise in the yen against the dollar nudged the index down 0.3 per cent.

Yellen's remarks

The sea change came after Federal Reserve Chair Janet Yellen emphasised global dangers to growth and inflation, and thus the need to proceed “cautiously” on tightening policy.

“Her comments stand somewhat in contrast to recent remarks by other FOMC members and are more clear in respect to downside risk factors,” said Michael Gapen, chief U.S. economist at Barclays.

“Hence, we see the comments as an effort to exert control over the message and, in doing so, tilt expectations for policy rate hikes in a decidedly dovish direction.”

US Treasury yields

Debt markets rallied hard in response with yields on 10-year US paper dropping 7 basis points to one-month low of 1.80 per cent.

Fed fund futures jumped as investors priced out any a chance of a hike in April and only a slim probability of a move in June. The December contract implies a rate of just 57 basis points compared to the current 37 basis points.

On Wall Street, technology shares led gains in major indexes and both the S&P 500 and Dow closed at their highs for 2016. The Dow rose 0.56 per cent, while the S&P 500 gained 0.88 per cent and the Nasdaq 1.67 per cent.

Dollar bulls

Dollar bulls were not so pleased and the US currency fell across the board. The dollar index was down at 95.168, having suffered its biggest one-day fall in nearly two weeks.

The greenback dipped to 112.51 yen and away from a two-week high of 113.80. It also lost ground on the euro to $1.1292, nearing the March peak of $1.1342.

Commodity currencies gained with the Australian dollar back above 76 U.S. cents and not far off a recent 8-1/2 month peak of $0.7681.

The drop in the US dollar helped oil prices regain a little ground, as did a forecast that US stockpiles may have grown by less than first thought.

U. crude added 40 cents to $38.68 a barrel, after falling around 3 percent on Tuesday. Brent rose 31 cents to $39.45.

Gold was up at $1,237 an ounce, after rising almost 2 per cent overnight.