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Kalshi leads Polymarket in reported midterm trading as House volume grows

An OddsChecker comparison puts Kalshi's midterm trading volume at nearly 1.1 billion dollars against more than 340 million dollars for Polymarket including its international site, with Kalshi's House market alone passing 150 million dollars by October 30.

Kalshi’s midterm trading volume stands at nearly 1.1 billion dollars, compared with more than 340 million dollars for Polymarket, according to an OddsChecker comparison.

The Polymarket figure includes its international site. That scope matters when comparing the reported totals, rather than treating the figure as a measure of only one part of Polymarket’s operations.

House trading adds to Kalshi’s total

Kalshi’s House market alone had exceeded 150 million dollars by October 30, according to OddsChecker. The figure provides a market-specific milestone alongside the broader midterm comparison.

The summary published on Nov 1, 2026 at 2:30 PM ET supplies volume figures, but no contract prices or implied probabilities. It therefore documents trading activity rather than how either platform’s participants assess the election outcome.

What it means for prediction markets

  • Activity differs substantially: The reported totals put Kalshi ahead of Polymarket in midterm trading volume, including Polymarket’s international site in the comparison.
  • The House is a notable component: Kalshi’s House market had passed 150 million dollars by October 30, within its nearly 1.1 billion dollars in midterm volume.
  • Volume is not an election forecast: These figures alone do not establish which outcomes traders favor or whether probabilities differ between platforms.
KalshiPolymarketMidtermsInfiniti MarketsInfiniti Signals

Sources & attribution

Published
  1. Source
    OddsCheckeroddschecker.com
    Publisher
    https://www.oddschecker.com
    Source URL
    The feed did not publish this story's article address.

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