S&P 500 outlook

Where Kalshi and Polymarket put the S&P 500 at each date they price, from the next close to year end.

• spot (number): The index.
• horizons[] (array): at, key (close, week, month, year), from (close or touch), people [level, chance at or above].
• GET /probabilities/outlook: S&P 500 outlook. Where Kalshi and Polymarket put the S&P 500 at each date they price, from the next close to year end.

Updated 2026-11-06 11:42 UTC