S&P 500 (SPX) Opens Up or Down on September 15?

根據「S&P 500 (SPX) Opens Up or Down on September 15?」的最新預測市場資料，交易者已形成強烈共識。

目前，Down 以壓倒性的 100% 獲勝機率主導市場；Up 以 0.1% 位居第二。該市場的下注量已達 $75.9K，反映出市場的高度關注。

為了更好地評估各潛在結果的位置，可依據隱含機率與合約定價將市場劃分為三個明顯的交易梯隊：

🥇 第一梯隊：絕對領跑者

• Down (100%)：Down 目前擁有最高機率，深受訂單簿青睞。看好該結果的交易者面對的「Buy Yes」合約價為 100¢，顯示出市場的高度確信。

🥈 第二梯隊：主要挑戰者

• Up (0.1%)：作為最可行的替代選項，Up 保持著 0.1% 的成真機率，其「Buy Yes」份額目前成交價為 0¢。

This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on September 15 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day.

This market will resolve to "Down" if the official S&P 500 Index open price for S&P 500 (SPX) on September 15 is lower than the official S&P 500 Index closing price for SPX 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 prices are exactly equal, this market will resolve 50-50. Note that all figures will be rounded to the nearest cent using standard rounding.

If SPX does not trade at all during the regular session, the market will resolve 50-50.

If either of the relevant days are shortened (for example, due to a market holiday schedule), the official open/close price published by S&P 500 Index for that shortened session will still be used for resolution.

If the previous trading day has no official closing price (for example, due to a trading halt into the market close, system issue, delisting, or other disruption), the market will use the last valid on-exchange trade price of the regular session as the effective closing price.

The resolution source for this market is the Wall Street Journal, specifically the Open/Close values published by the WSJ under "Historical Prices".

US: https://www.wsj.com/market-data/stocks

EMEA: https://www.wsj.com/market-data/stocks/emea

ASIA: https://www.wsj.com/market-data/stocks/asia

人群共識與投機成交塑造了更宏觀的預測市場，而我們的量化演算法提供了資料驅動的反向視角。透過分析基本面訊號、底層趨勢與歷史分布，我們的 AI 估值模型為每個結果獨立測算出一個「公允價值」機率。

將該公允價值與當前交易價值對比，可揭示出重大背離——即期望值（EV）差。正 EV 差代表統計上被低估的結果，而負 EV 差則提示市場可能存在反應過度。

頂級 AI Alpha 與錯誤定價套利機會

根據最新一輪資料模型測算，以下幾個關鍵合約存在顯著偏離：

• 最被高估的結果：Down 當前交易價為 100%，但我們的 AI 測算其公允價值僅為 77.5%，形成 -22.5% 的較大負 EV 差，表明人群可能過度炒作該結果、把溢價推得過高。
• 最佳價值標的（最高 EV）：我們的模型將 Up 識別為盤面上最具價值的機會。市場僅給予其 0.1% 的交易機率，而我們 AI 的公允價值評估為 22.5%——形成可觀的 +22.5% EV 差。