Kalshi outpaces Polymarket US as October trading exceeds prior records
Kalshi generated approximately 65 billion dollars in October trading volume, already 10 percent above its September record, while Polymarket US reached 10 billion dollars, about 15 percent above its previous monthly total. Open interest reached 2.05 billion dollars on Kalshi and 384 million dollars on Polymarket US, with Kalshi holding nearly 83 percent of combined volume across the three platforms compared.
Kalshi generated approximately $65 billion in October trading volume, putting it 10 percent above its September record, according to Coinpaper. The figures appeared in an update published Nov 2, 2026, at 1:00 AM ET.
Polymarket US reached $10 billion in volume, about 15 percent higher than its previous monthly total. Its percentage increase exceeded Kalshi’s, although its trading volume remained substantially smaller.
Volume share and open positions
Kalshi accounted for nearly 83 percent of combined trading volume across the three platforms compared. The supplied summary does not identify the third platform or provide its individual results.
Open interest reached $2.05 billion on Kalshi and $384 million on Polymarket US, according to Coinpaper. Kalshi therefore led Polymarket US on both reported measures: monthly trading activity and outstanding positions.
What it means for prediction markets
- Scale and growth tell different stories: Kalshi had substantially greater October volume, while Polymarket US recorded the larger percentage increase over its previous monthly total.
- The market-share comparison has limits: Kalshi’s nearly 83 percent share applies to the three platforms compared, not necessarily the entire prediction-market industry.
- Aggregate activity does not establish contract-level liquidity: The supplied figures do not show how volume or open interest was distributed across individual markets.
Sources & attribution
- Published
- Source
- Coinpaper
- Publisher
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- Source URL
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Full attribution under the Digital Millennium Copyright Act (DMCA), 17 U.S.C. § 512: this article is an original report by Infiniti Intelligence that summarizes the reporting of the publishers named above, links to their original work, and reproduces no protected expression beyond brief factual reference and in-line attribution (“according to Coinpaper”). All rights in the underlying reporting remain with the publishers listed; nothing here implies endorsement by or affiliation with them. Rights holders may request correction, update or removal through the contact address published at infiniti.w3ai.io.
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