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

根据「S&P 500 (SPX) Opens Up or Down on September 15?」的最新预测市场数据，交易者已形成强烈共识。

目前，Down 以压倒性的 100% 获胜概率主导市场；Up 以 0.1% 位居第二。该市场的下注量已达 $75.9K，反映出市场的高度关注。

为了更好地评估各潜在结果的位置，可依据隐含概率与合约定价将市场划分为三个明显的交易梯队：

🥇 第一梯队：绝对领跑者

• Down (100%)：Down 目前拥有最高概率，深受订单簿青睐。看好该结果的交易者面对的「Buy Yes」合约价为 100¢，显示出市场的高度确信。

🥈 第二梯队：主要挑战者

• Up (0.1%)：作为最可行的替代选项，Up 保持着 0.1% 的成真概率，其「Buy Yes」份额目前成交价为 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

人群共识与投机成交塑造了更宏观的预测市场，而我们的量化算法提供了数据驱动的反向视角。通过分析基本面信号、底层趋势与历史分布，我们的 AI 估值模型为每个结果独立测算出一个「公允价值」概率。

将该公允价值与当前交易价值对比，可揭示出重大背离——即期望值（EV）差。正 EV 差代表统计上被低估的结果，而负 EV 差则提示市场可能存在反应过度。

顶级 AI Alpha 与错误定价套利机会

根据最新一轮数据模型测算，以下几个关键合约存在显著偏离：

• 最被高估的结果：Down 当前交易价为 100%，但我们的 AI 测算其公允价值仅为 77.5%，形成 -22.5% 的较大负 EV 差，表明人群可能过度炒作该结果、把溢价推得过高。
• 最佳价值标的（最高 EV）：我们的模型将 Up 识别为盘面上最具价值的机会。市场仅给予其 0.1% 的交易概率，而我们 AI 的公允价值评估为 22.5%——形成可观的 +22.5% EV 差。