US stock futures fell on Tuesday in the wait for the Federal Reserve meeting to start, as investors gauged the impact of President Trump's tariffs on its decision making and the path of interest rates.

Shares were mostly higher early Tuesday in Asia after benchmarks fell on Wall Street, snapping a nine-day winning streak. Oil prices bounced back slightly from a 4-year low and U.S. stock futures slipped.

Investors were feeling on edge Tuesday as uncertainty about President Donald Trump's trade policies looked set to drag down the blue-chip U.S. stock indexes. The Cboe Volatility Index, a widely followed fear gauge that tracks S&P 500 options contracts and trades under the ticker VIX,

The 55% decline in the stock from its 2021 high, combined with the company's consistent revenue growth since then, has pushed its price-to-sales (P/S) ratio down to just 4.9. It's close to the cheapest level in five years, and it's also a 49% discount to its average P/S ratio of 9.6 over that period:

Today, SERV trades at $7.05 per share with a $400 million valuation. Wall Street, though, is unanimous Serve Robotics can still make investors very rich. Of the five analysts covering SERV, there is a consensus strong buy rating and they have a one-year price target of $19.50 per share, implying 177% upside.