S&P 500 (SPX) Up or Down on September 18? leads at 70%. Moderate consensus — room for value on contrarian bets.
| # | Outcome | Probability | If Right | Volume |
|---|---|---|---|---|
| 1 | S&P 500 (SPX) Up or Down on September 18? | 70% | +43% | $18K |
Real-money prediction market · Trade with confidence
This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Friday, September 18, 2026 is higher than the official S&P 500 Index closing price for SPX on the most...
This prediction market tracks whether S&P 500 (SPX) Up or Down on September 18? will occur, with $18K in total trading volume reflecting significant trader interest. Prediction markets aggregate the collective intelligence of participants who stake real money on outcomes, making them one of the most reliable forecasting tools available for events driven by available information and market participant behavior.
Traders lean toward S&P 500 (SPX) Up or Down on September 18? at 70%, suggesting a probable but not certain outcome. This moderate confidence level often reflects genuine uncertainty — markets at this range tend to see the most price movement as new information emerges.
Trading activity is exceptionally high, with $18K traded in the last 24 hours alone (100% of total volume). This surge often indicates breaking news, a key deadline approaching, or a significant shift in market sentiment.
This market is scheduled to resolve by 2026-09-18. As the resolution date approaches, expect increased trading activity and tighter probability estimates. Historical data shows that prediction market accuracy improves significantly in the final days before resolution.
As of Sep 18, 2026 at 05:35 UTC, the leading outcome is S&P 500 (SPX) Up or Down on September 18? at 70% probability, with $18K in total trading volume on Polymarket.
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