So, will the stock market open up or down on Tuesday? If you ask the folks betting real money on prediction markets, the answer is a resounding "down." Traders on the Polygon-based platform Polymarket are pricing a 93% chance that the S&P 500 opens lower, with only a 7% chance it opens higher. That's a pretty strong consensus, and it comes with about $28,200 in volume backing the bet. It's the financial equivalent of everyone looking at the same storm clouds and deciding to bring an umbrella.

This bearish lean isn't happening in a vacuum. It follows a volatile Monday where the S&P 500 managed to claw its way back to close just above the flatline after early losses. The session was a tale of two markets: tech and defense stocks provided a floor, while airline and cruise names—those sensitive to fuel costs—dragged. At last check, S&P 500 futures were pointing lower, down about 0.72% to 6,838.50.

The real story, though, isn't just about stocks. It's about oil. Crude prices shot up Monday, at one point gaining about 12%, as investors grappled with the weekend's air strikes and the very real worry that things could escalate. Here's why that matters: Iran is the fourth-largest oil producer in OPEC and sits right next to the Strait of Hormuz. That narrow waterway is a superhighway for oil, with about one-fifth of the world's consumption passing through it. Iran has threatened to close it and fire on any ship trying to pass. When you're talking about blocking a fifth of the world's oil, prices are going to move.

And higher oil prices have a nasty habit of making everything more expensive. This complicates life immensely for the Federal Reserve, which has been trying to tame inflation. Markets have been happily pricing in potential interest rate cuts later this year, but persistently high energy costs could throw a wrench in those plans. It's a reminder that geopolitics and monetary policy are often on a collision course.

The broader backdrop isn't exactly screaming strength either. The S&P 500 fell 0.8% in February, closing the month at 6,878.88. The momentum heading into March was already fragile, and now you've got a fresh dose of uncertainty.

But wait, it's not all doom and gloom. Monday's session showed that dip buyers haven't gone extinct. Some market strategists are making a counterargument: unless energy prices stay high for a long time, the market might just "look through" this short-term geopolitical shock. It's a bump in the road, not a cliff.

Stephen Innes, Head of Trading and Market Strategy at SPI Asset Management, framed it well. He wrote that the market's reaction looks more like a repricing of risk tied to energy and timing, rather than outright panic. He called the tone "seasoned behaviour rather than systemic stress," noting that buyers did step in later in the day. Historically, that's a pattern—equities often stabilize once the initial oil-driven volatility starts to ease.

For what it's worth, the Polymarket crowd has been right recently. They correctly called Monday's down open, where the S&P 500 started the day 54.52 points lower. That bet saw over $1.7 million in trading volume. So when they place a 93% bet on another down day, it's worth paying attention. They're not just guessing; they're putting money where their mouth is, and recently, their mouth has been pretty accurate.

So, as Tuesday approaches, the market finds itself balancing on a knife's edge. On one side, you have surging oil prices, Middle East tensions, and a heavy bet from prediction markets that stocks will open lower. On the other, you have a market that showed resilience Monday and a belief from some quarters that this could be a temporary shock. The opening bell will tell us which narrative wins the day.