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Prediction markets trade a record 121.28 billion dollars in October, up 58.7 percent, with Kalshi and Polymarket holding 97.7 percent of event contract volume, VIP-Grinders reports
- Prediction markets trade a record 121.28 billion dollars in October, up 58.7 percent, with Kalshi and Polymarket holding 97.7 percent of event contract volume, VIP-Grinders reports — VIP-Grinders, in its October 2026 prediction markets report published November 4 using Artemis data, says open interest rose 41.5 percent to 3.13 billion dollars. Politics and elections took 4.5 percent of volume over the past year but held 41.2 percent of open interest, with political open interest rising 52 percent in October to 1.01 billion dollars. (VIP-Grinders)
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