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October prediction market volume rose 58.7 percent to a record 121.28 billion dollars, with open interest up 41.5 percent to 3.13 billion dollars, VIP Grinders reports
- October prediction market volume rose 58.7 percent to a record 121.28 billion dollars, with open interest up 41.5 percent to 3.13 billion dollars, VIP Grinders reports — The October 2026 report, built on Artemis data across 11 platforms, says politics and elections took under 5 percent of trading volume over the past year yet held 41.2 percent of open interest, while Kalshi and Polymarket together ran 97.7 percent of event contract volume. (VIP Grinders)
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