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Kalshi leads midterm trading totals as Polymarket offers broader market menu

Oddschecker compared the two venues for the 2026 midterms, putting Kalshi midterm trading volume at nearly 1.1 billion dollars against more than 340 million dollars on Polymarket including its international site, citing CNN figures from October 23. Kalshi's House market alone had passed 150 million dollars traded by October 30, while Polymarket lists more than 560 midterm markets.

Kalshi’s trading volume for the 2026 midterms stood at nearly 1.1 billion dollars, compared with more than 340 million dollars on Polymarket, according to Oddschecker’s comparison citing CNN figures from October 23.

The Polymarket total includes its international site. That scope matters when comparing the venues: the reported figure is not limited to a single domestic offering.

Volume and market count offer different perspectives

Kalshi’s House market alone had exceeded 150 million dollars in trading by October 30, according to Oddschecker. That later figure provides a separate measure of activity in one election market, rather than an updated total for all midterm trading.

Polymarket, meanwhile, lists more than 560 midterm markets, according to Oddschecker. The market count describes the range of contracts available, while the volume figures measure trading activity; the two metrics are not interchangeable.

What it means for prediction markets

  • Kalshi leads on reported volume: The October 23 figures place its midterm trading total well above Polymarket’s, including the latter’s international site.
  • The dates differ: Kalshi’s House-market milestone is dated October 30, so it should not be treated as part of a synchronized update to both venues’ overall totals.
  • Activity is not an election forecast: These figures describe trading volume and market availability, not contract prices or implied probabilities for midterm outcomes.
KalshiPolymarketMidtermsInfiniti MarketsInfiniti Signals

Sources & attribution

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    Oddscheckeroddschecker.com
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    https://www.oddschecker.com
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