SYDNEY - Asian share markets got off to a cautious start on Monday as earnings season loomed as a challenge ​to sky-high tech valuations, while oil was choppy after strikes on shipping and airports in the Gulf.

Brent futures started higher but soon slipped 1.1 percent to $103.50 a barrel, away from the recent top of $109.97, while US crude ​futures lost 1.2 percent to $90.73 a barrel.

South Korean stocks fell 1.1 percent, while MSCI's broadest index of Asia-Pacific shares outside Japan was little ​changed.

On Wall Street, S&P 500 futures edged up 0.2 percent, while Nasdaq futures firmed 0.5 percent. In Europe, EUROSTOXX 50 ⁠futures firmed 0.4 percent, while DAX futures gained 0.4 percent and FTSE futures added 0.3 percent.

Trade was thin with Japan markets shut and the US on a ​partial holiday ahead of the earnings season with major US banks kicking off on Tuesday.

S&P 500 earnings are expected to have jumped by more than ​30 percent in the third quarter, according to LSEG IBES, though the bulk of that comes from the tech sector.

My Bui, an economist at AMP, noted all the gains in the S&P 500 since mid-September had been in tech, while investors were demanding higher yields to fund the massive borrowing for AI.

The US investment-grade credit default ​swap index, which tracks the cost of insurance against default, had also risen sharply to its highest level since the conflict in Iran began.

"Overall, wider ​spreads suggest investors are questioning whether AI revenues can keep pace with rising borrowing costs," added Bui. "Corporate bond issuance to fund AI capex, combined with wider ‌high-yield spreads, ⁠will raise refinancing costs as the current wave of debt matures over the next few years."

US CPI to heat up, but core cooler

The flood of corporate debt has added to pressure in sovereign markets, driving Treasury yields to 24-year highs last week and lifting the discount applied to company earnings.

The market faces fresh challenges this week from US data on consumer and producer prices and retail sales. Rising energy costs are expected to ​lift CPI by a hefty 0.6 percent ​to an annual 3.7 percent, though ⁠the core is seen cooler at 0.2 percent and 2.5 percent.

"Oil prices remain higher than we had assumed as shipping costs have soared, and product prices are even higher," said Bruce Kasman, head of global economics at JPMorgan.

"The ​signals on inflation point to a sharp rebound in headline inflation that will squeeze purchasing power and ​a firming in core ⁠inflation that will keep central banks focused on near-term hikes."

Markets imply only an 18 percent chance of a rate rise from the Federal Reserve this month, but an 85 percent chance of a hike in December. Investors are also wagering on hikes in the EU, Japan and UK before year end.

In currency markets, ⁠the euro remained ​on the defensive at $1.1201 having fallen for five weeks straight amid concerns about government ​deficits in Europe.

The dollar index held near 17-month highs at 102.25, but has stalled on the yen at 158.15 as the threat of Japanese intervention deters speculators for now.

In commodity ​markets, non-interest-bearing gold rose 0.3 percent to $4,206 an ounce , having managed to bounce more than 1 percent last week.