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Kalshi and Polymarket US set October records as trading expands

CoinPaper reports Kalshi generated about 65 billion dollars in October trading volume, 10 percent above its September record, while Polymarket US reached 10 billion dollars, about 15 percent above its previous monthly total. Open interest in the same snapshot reached 2.05 billion dollars on Kalshi and 384 million dollars on Polymarket US.

Kalshi and Polymarket US each posted record monthly trading volume in October, according to CoinPaper. Both platforms exceeded their prior monthly benchmarks.

October volume rises on both platforms

Kalshi generated about 65 billion dollars in trading volume during October, according to CoinPaper. That was 10 percent above its September record.

Polymarket US recorded 10 billion dollars in October volume, about 15 percent above its previous monthly total. Its percentage increase was larger than Kalshi’s, although its total volume remained substantially smaller.

Open interest adds another measure

In the same snapshot, open interest stood at 2.05 billion dollars on Kalshi and 384 million dollars on Polymarket US, according to CoinPaper.

The figures distinguish monthly trading activity from positions still open at the snapshot. The supplied summary does not include earlier open-interest readings, so it does not establish whether that measure also reached a record.

What it means for prediction markets

  • Both platforms reached monthly volume highs, with Kalshi leading in total activity and Polymarket US posting the larger percentage increase.
  • Open interest provides a separate measure of outstanding positions; it should not be treated as equivalent to monthly trading volume.
  • The supplied figures do not identify which contracts drove activity or show how trading was distributed across markets.
KalshiPolymarketInfiniti MarketsInfiniti Signals

Sources & attribution

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    CoinPaper
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