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Prediction market open interest rises 41.5 percent to 3.13 billion dollars in October as Kalshi and Polymarket reach 97.7 percent of event contract volume, VIP Grinders reports
- Prediction market open interest rises 41.5 percent to 3.13 billion dollars in October as Kalshi and Polymarket reach 97.7 percent of event contract volume, VIP Grinders reports — The October 2026 report, built on Artemis data exported on November 3, puts October trading volume at a record 121.28 billion dollars, up 58.7 percent, with Kalshi combination contracts accounting for 66.78 billion dollars of it. Across the trailing twelve months on the two main platforms, sports contracts made up 43.6 percent of volume while politics and elections held 41.2 percent of open interest on just 4.5 percent of volume. (VIP Grinders)
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