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Kalshi and Polymarket together now run 97.7 percent of event contract volume, up from 63 percent in December, Artemis data via VIP-Grinders reports
- Kalshi and Polymarket together now run 97.7 percent of event contract volume, up from 63 percent in December, Artemis data via VIP-Grinders reports — VIP-Grinders' October 2026 prediction markets report, built on Artemis data across 11 platforms, says Kalshi and Polymarket together now account for 97.7 percent of event contract volume, up from 63.0 percent in December. The same report put October volume at a record 121.28 billion dollars, with Kalshi and Polymarket the only platforms tracked in its category and fee analysis because of that combined share. (VIP-Grinders)
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