SPY ended Wednesday near $754, and Polymarket traders are leaning toward more trouble before September ends.
The market puts the chance of a touch of $740 at roughly 56%. A rebound to $770 is priced around 32%. Those levels are almost equally far away: a 1.9% decline versus a 2.1% rally, with ten trading sessions remaining.
That gap captures the mood after the Fed’s latest decision. Investors are more concerned about another selloff than confident in a recovery. Whether that concern has become too expensive is the more interesting question.
The market asks one thing: what level does SPY hit at any point in September at Polymarket?
Let's further examine how you can trade contracts with our Polymarket promo code for the S&P 500 market in September.
Monthly S&P 500 Direction
The Fed raised interest rates by a quarter point to a range of 3.75%–4.00%, and its median projection points toward another increase before year-end. Officials described an economy that remains resilient while inflation stays elevated. That leaves stocks facing the prospect of higher borrowing costs for longer.
These are touch markets. SPY only needs to reach the level once during the contract’s qualifying window. A brief drop to $740 would count even if it recovered to $750 that afternoon. The rules use Pyth’s one-minute prices during regular trading hours; premarket and after-hours moves do not qualify.
S&P 500 Monthly Performance Prediction
The downside prices look relatively expensive compared with September’s recent trading. Daily closing returns have produced annualized volatility of roughly 9%–10% so far. A simple model needs volatility closer to 16% to justify the $740 contract’s quoted probability.
The appeal of buying No is straightforward: if the market settles down after the Fed decision, traders may have paid too much for the possibility of another drop.
But there is a meaningful complication arriving Friday.
SPY goes ex-dividend on September 18. All else equal, its quoted price adjusts lower by the amount of the dividend. That moves it closer to $740 even without additional selling pressure across the underlying stocks.
For perspective, a hypothetical $2 distribution would use up $2 of the current $14 cushion above the target. The actual dividend amount matters, but the broader point is simple: the full distance to $740 does not necessarily have to come from a market selloff.
The calendar also gives investors little room to relax near the finish. August job-openings data arrives September 29. The following morning, September 30, brings August PCE inflation at 8:30 a.m. ET, the final trading day of the market. A hotter-than-expected reading could reinforce expectations for another hike and put stocks under pressure again.
The Trade
The current price of NO on the $740 strike is interesting, but the edge depends heavily on how turbulent the next two weeks become. A simplified model using 12% volatility values NO around 57 cents. Raise that assumption to 16%, and its value falls to roughly 44 cents. Those estimates also leave out the scheduled dividend and sudden price gaps.
I would keep $740 No on the watchlist rather than treat it as an obvious bet. The case improves if stocks stabilize after the dividend adjustment and the entry price remains attractive. It weakens if Treasury yields keep climbing or incoming data makes another Fed hike look more likely.
