TOTAL VOLUME:
$134.1b
24H VOL:
$141,541,542
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,440,096,988
406,065
Markets across
30,522
events
MATCHED EVENTS:
2,692
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Jul 17, 4:00 PM EST
Kalshi
Traders predict where the S&P 500 index will close on July 17, 2026 at 4pm EDT. The market divides the full range of possible index values into specific price bands, with each band representing a distinct outcome. Exactly one band will contain the actual closing value, determining the resolution.
This event resolves based on the end-of-day S&P 500 index value on July 17, 2026. The index value is divided into thirty contiguous price ranges, each spanning 25 points (with the exception of the lowest range which extends to 7,174.9999 and the highest range which extends above 7,874.9999). Each range corresponds to a separate market outcome. Resolution occurs when the official closing index value falls within one of these ranges. The market closes on July 17, 2026 and expires at the sooner of the first release of official data or one week after July 17, 2026. Per the Kalshi Rulebook, the Exchange has modified the Source Agency and Underlying for indices markets.
Prediction market odds reflect real money at stake, creating incentives for traders to incorporate the latest data and expert views into their positions. Analyst forecasts, by contrast, are typically point estimates or ranges published on a fixed schedule. This market aggregates dispersed trader knowledge into continuous odds that often diverge from published analyst consensus, especially as new economic data or market volatility emerges closer to the resolution date. Comparing the two can reveal where professional forecasters and active traders disagree on the likely S&P 500 closing price.
On Kalshi, this market is priced through a continuous order book where traders buy and sell contracts corresponding to each S&P 500 price range outcome. On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. Each contract pays out based on where the index actually closes, and the bid-ask spread reflects the market's uncertainty around that outcome. Prices move in real time as new orders flow in, allowing you to enter or exit positions at any time before the market closes. The platform displays the implied probability for each range, making it easy to compare relative confidence across outcomes.
This market resolves around Jul 17, 2026, once the S&P 500 closing price for that date and time is verified against credible public sources. The outcome is determined by which price range bracket contains the official closing value reported by major financial data providers. No further action is required from traders after the market closes; resolution is automatic once the index value is confirmed. Payouts are distributed to holders of the winning outcome contract.
Major economic data releases—including inflation reports, employment figures, and Federal Reserve communications—typically drive significant S&P 500 moves and shift trader expectations in this market. Corporate earnings announcements, geopolitical developments, and changes in interest rate expectations can also reshape the odds across price ranges. Market volatility spikes, credit events, or unexpected policy shifts may cause rapid repricing as traders reassess the probability of each outcome. Monitoring financial news and economic calendars in the weeks leading up to July 17, 2026 will help you anticipate potential shifts in trader positioning.