SPY (SPY) Up or Down on September 28? Odds & Prediction Markets

Name: SPY (SPY) Up or Down on September 28?
Start: 2026-09-25T12:01:11.000Z
End: 2026-09-28T20:00:00.000Z

Description

This market will resolve to "Up" if the Close price for S&P 500 (SPY) on September 28, 2026 is higher than the Close price for S&P 500 (SPY) on the most recent prior trading day. This market will resolve to "Down" if the Close price for S&P 500 (SPY) on September 28, 2026 is lower than the Close price for S&P 500 (SPY) on the most recent prior trading day. E.g., ordinarily, a market on Monday would refer to the previous Friday for its most recent closing price, unless that Friday were a market holiday, in which case it would refer to Thursday, or the next most recent trading day. If the two specified closing prices are exactly equal, this market will resolve 50-50. Closing prices will be used exactly as published by Pyth, without rounding. If S&P 500 (SPY) does not trade at all during the regular session, the market will resolve 50-50. For a standard full trading session, the closing price refers to the Pyth "Close" value of the 1-minute candle corresponding to the final minute of regular trading hours on the primary exchange. If either of the relevant days has no valid Pyth Close value for the 1-minute candle corresponding to the end of regular trading hours on the primary exchange, the market will use the last valid Pyth price achieved during the regular trading hours of the primary exchange as the effective closing price. If no valid Pyth price exists for that trading day due to a system outage, data failure, or other technical disruption, the official closing price published by the primary exchange on which the listed security trades will be used to determine the closing price for that day. Only prices achieved during the regular trading hours of the primary exchange on which the listed security trades (typically 9:30 AM – 4:00 PM ET) will be considered. In the event of a stock split, reverse stock split, or similar corporate action affecting the listed security during the listed time frame, this market will resolve based on split-adjusted prices as displayed on Pyth. The resolution source for this market will be Pyth, specifically the "Close" values for the relevant 1-minute candle available at https://pythdata.app/explore/Equity.US.SPY%2FUSD. Historical 1-minute candles may be accessed by appending a Unix timestamp (seconds) to the Pyth chart URL using the "t=" parameter. Any timestamp within the listed market time frame may be used to view the relevant candle data (e.g., https://pythdata.app/explore/Equity.US.SPY%2FUSD?t=1773432000).

Polymarket

This market will resolve to "Up" if the Close price for S&P 500 (SPY) on September 28, 2026 is higher than the Close price for S&P 500 (SPY) on the most recent prior trading day. This market will resolve to "Down" if the Close price for S&P 500 (SPY) on September 28, 2026 is lower than the Close price for S&P 500 (SPY) on the most recent prior trading day. E.g., ordinarily, a market on Monday would refer to the previous Friday for its most recent closing price, unless that Friday were a market holiday, in which case it would refer to Thursday, or the next most recent trading day. If the two specified closing prices are exactly equal, this market will resolve 50-50. Closing prices will be used exactly as published by Pyth, without rounding. If S&P 500 (SPY) does not trade at all during the regular session, the market will resolve 50-50. For a standard full trading session, the closing price refers to the Pyth "Close" value of the 1-minute candle corresponding to the final minute of regular trading hours on the primary exchange. If either of the relevant days has no valid Pyth Close value for the 1-minute candle corresponding to the end of regular trading hours on the primary exchange, the market will use the last valid Pyth price achieved during the regular trading hours of the primary exchange as the effective closing price. If no valid Pyth price exists for that trading day due to a system outage, data failure, or other technical disruption, the official closing price published by the primary exchange on which the listed security trades will be used to determine the closing price for that day. Only prices achieved during the regular trading hours of the primary exchange on which the listed security trades (typically 9:30 AM – 4:00 PM ET) will be considered. In the event of a stock split, reverse stock split, or similar corporate action affecting the listed security during the listed time frame, this market will resolve based on split-adjusted prices as displayed on Pyth. The resolution source for this market will be Pyth, specifically the "Close" values for the relevant 1-minute candle available at https://pythdata.app/explore/Equity.US.SPY%2FUSD. Historical 1-minute candles may be accessed by appending a Unix timestamp (seconds) to the Pyth chart URL using the "t=" parameter. Any timestamp within the listed market time frame may be used to view the relevant candle data (e.g., https://pythdata.app/explore/Equity.US.SPY%2FUSD?t=1773432000).

Frequently asked questions

On Polymarket, the dashboard for the SPY direction market tracks the current odds, price history, and 24-hour trading volume. Currently, the volume for this market is $12,214. Users can see how the probabilities for the SPY being up or down on September 28th have changed over time, providing insight into market sentiment. The dashboard also displays the total volume traded to date, which is $12,410. This allows traders to assess the level of interest and activity surrounding this prediction.

Currently, prediction market participants are indicating a strong belief in a particular outcome for the SPY direction market. It’s interesting to compare this to traditional analyst forecasts. Recent polls and expert opinions show a range of predictions regarding the SPY’s movement by September 28th, with some anticipating a rise and others predicting a decline. However, this market reflects the collective wisdom of traders willing to put capital behind their beliefs, potentially offering a different perspective than those expressed in standard financial analysis.

This market resolves around Sep 28, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. The resolution will be based on the closing price of the SPY on September 28th. If the closing price is higher than the opening price, the “Up” outcome will be considered correct. Conversely, if the closing price is lower than the opening price, the “Down” outcome will be considered correct. Traders will be able to claim their winnings based on the final outcome determined by this price comparison.

Several key signals and events could significantly impact this market before Sep 28, 2026. Major economic data releases, such as inflation reports or employment figures, could influence investor sentiment and drive price movements in the SPY. Unexpected geopolitical events or shifts in Federal Reserve policy could also create volatility. Furthermore, company earnings reports from large-cap stocks within the SPY index could have a noticeable effect. Any news that alters the overall risk appetite of the market is likely to cause shifts in the odds within this market.

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