S&P 500 (SPX) Up or Down on July 28?

根據「S&P 500 (SPX) Up or Down on July 28?」的最新預測市場資料，交易者已形成強烈共識。

目前，Up 以壓倒性的 84% 獲勝機率主導市場；Down 以 16% 位居第二。該市場的下注量已達 $69K，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

• Up (84%)：Up 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 84¢，顯示出市場的高度確信。

🥈 第二梯隊：主要挑戰者

• Down (16%)：作為最可行的替代選項，Down 保持著 16% 的成真機率，其「Buy Yes」份額目前成交價為 16¢。

This market will resolve to "Up" if the official S&P 500 Index closing price for S&P 500 (SPX) on Tuesday, July 28, 2026 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 closing price for S&P 500 (SPX) on Tuesday, July 28, 2026 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 specified closing 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 closing price published by S&P 500 Index for that shortened session will still be used for resolution.

If either of the relevant days have 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 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：Up 當前交易價為 84%，但我們的 AI 測算其公允價值僅為 81%，形成 -3% 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 Down 識別為盤面上最具價值的機會。市場僅給予其 16% 的交易機率，而我們 AI 的公允價值評估為 19%——形成可觀的 +3% EV 差。