October 2026 prediction market volume rose 58.7 percent to a record 121.28 billion dollars, with Kalshi and Polymarket running 97.7 percent of event contract volume, VIP-Grinders reports
The October 2026 monthly report, built on Artemis data across 11 platforms, puts October volume at a record 121.28 billion dollars, up 58.7 percent, with open interest up 41.5 percent to 3.13 billion dollars and the two largest venues accounting for 97.7 percent of event contract volume.
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