Signs that a majority of the US Supreme Court was skeptical about the legality behind a swath of President Donald Trump's sweeping tariffs also provided a little support.

Trader sentiment creeped back after Wednesday's selloff that came on the back of growing worries that the tech-fueled AI rally that has characterized markets this year has led to a bubble that could soon pop.

The rush for cover -- which tracked big losses on Wall Street -- hammered some regional giants including Japanese tech investor SoftBank and South Korean chipmakers Samsung and SK hynix.

However, New York investors enjoyed a much happier Wednesday after figures from payrolls firm ADP showed US private sector employment jumped far more than expected last month, having surprisingly fallen the month before.

That came as a separate report indicated that activity in the crucial services industry grew far more than estimates.

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The jobs data release is likely to attract extra attention as it is one of the few economic indicators to come out in recent weeks owing to the US government shutdown.

After Wall Street's advance, which was also helped by upbeat earnings, Asia followed suit.

Tokyo and Seoul were both well up, though still some way from clawing back all Wednesday's losses.

Hong Kong, Shanghai, Sydney, Singapore, Taipei, Manila and Jakarta also rose.

Still, there is some concern that valuations have run a little too high on the back of the AI frenzy, which has pushed some firms to records -- with US chip titan Nvidia topping a $5 trillion valuation.

"Valuation concerns have intensified as the (S&P 500) index has climbed higher throughout the year," Fabien Yip, market analyst at IG.

"Investors are questioning whether current price levels can be sustained, particularly on stocks boosted by the AI boom if interest rates remain elevated for longer than expected."

Investors were keeping a keen eye on developments in Washington after a majority of Supreme Court justices queried Trump's ability to impose his tariffs, which have raked in billions of dollars in customs revenue.

The nine justices are considering Trump's use of emergency powers to impose "reciprocal" tariffs on nearly every US trade partner, as well as levies targeting Mexico, Canada and China over their alleged roles in illicit drug flows.

In a hearing Wednesday several conservative justices, along with the three liberals, questioned whether the International Emergency Economic Powers Act (IEEPA) that Trump invoked confers the authority to impose tariffs.

"The statute doesn't use the word tariffs," said Chief Justice John Roberts, and imposing tariffs is equivalent to taxation, which has always been a "core power of Congress".

The justices sought to clarify whether Congress has to give clear authorization for policies with significant economic or political consequences.

Justice Sonia Sotomayor, a liberal, noted that the power to impose taxes is a "congressional power, not a presidential power".

"You want to say tariffs are not taxes, but that's exactly what they are," Sotomayor said.

Still, lawyers noted that if the top court finds Trump's global tariffs illegal, the government can tap other laws to temporarily impose up to 15 percent duties while pursuing pathways for more lasting levies.

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