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Kalshi combination contracts drive most of October’s prediction market growth

The October 2026 edition of the Prediction Markets Report puts monthly volume at a record 121.28 billion dollars, up 58.7 percent, with open interest up 41.5 percent to 3.13 billion dollars. Kalshi combination contracts accounted for about 70 percent of the increase.

Prediction-market volume across tracked platforms reached a record 121.28 billion dollars in October 2026, an increase of 58.7 percent, according to VIP-Grinders.

The figures come from the October 2026 edition of the Prediction Markets Report, reported on Nov 5, 2026, at 4:15 AM ET.

Volume and open interest advance

Open interest rose 41.5 percent to 3.13 billion dollars, according to VIP-Grinders. Both measures increased, though open interest grew more slowly than monthly trading volume.

Kalshi combination contracts accounted for about 70 percent of the increase in volume. That places those contracts at the center of October’s growth, rather than establishing that activity expanded evenly across tracked platforms.

What it means for prediction markets

  • The record has a defined scope: The 121.28 billion dollars covers tracked platforms, not necessarily the entire prediction-market sector.
  • The growth driver matters: Kalshi combination contracts contributed about 70 percent of the volume increase, making product-level activity important when interpreting the headline figure.
  • Volume and open interest tell different stories: The respective increases of 58.7 percent and 41.5 percent should not be treated as interchangeable measures of market activity.
KalshiInfiniti MarketsInfiniti Signals

Sources & attribution

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    VIP-Grinders
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