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Kalshi extends monthly trading record as open interest hits new highs

CoinPaper reports open interest also reached record levels in the snapshot, with Kalshi at 2.05 billion dollars and Polymarket US at 384 million dollars. Kalshi controlled nearly 83 percent of combined volume across Kalshi, Polymarket US and Polymarket Global in the comparison.

Kalshi’s October trading volume reached about 65 billion dollars, exceeding its September record by 10 percent, according to CoinPaper. Polymarket US recorded 10 billion dollars in volume.

Volume and market share

Kalshi accounted for nearly 83 percent of combined volume in CoinPaper’s comparison of Kalshi, Polymarket US and Polymarket Global. That share puts its October activity well ahead of the other two platforms combined.

The comparison includes both Polymarket US and Polymarket Global, but the supplied summary does not give a separate volume figure for Polymarket Global.

Open interest reaches records

CoinPaper also reported record open interest in the snapshot: 2.05 billion dollars at Kalshi and 384 million dollars at Polymarket US.

The figures show that Kalshi’s new monthly volume high coincided with record open interest. The supplied summary does not provide a breakdown by contract or event, limiting conclusions about which markets drove the activity.

What it means for prediction markets

  • Trading remains concentrated: Kalshi’s nearly 83 percent share applies specifically to the three-platform comparison, not necessarily the entire prediction-market industry.
  • Volume and open interest tell different stories: October volume measures trading activity, while the record open-interest figures capture outstanding positions in the reported snapshot.
  • Contract-level conclusions remain limited: The aggregate figures do not establish where liquidity was strongest or which event probabilities changed.
KalshiPolymarketInfiniti MarketsInfiniti Signals

Sources & attribution

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    CoinPaper
    Publisher
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