Kalshi trading boom drops Polymarket share of monthly volume to 27 percent
October data cited by Crypto Briefing puts Kalshi at roughly 65 billion dollars in trading volume, about 10 percent above September, while Polymarket US recorded about 10 billion dollars. Kalshi held about 83 percent of volume among US-regulated platforms, with about 2.05 billion dollars in open interest against Polymarket US at about 384 million dollars.
Kalshi leads reported October activity
Kalshi recorded roughly 65 billion dollars in October trading volume, about 10 percent more than in September, according to Crypto Briefing. Polymarket US recorded about 10 billion dollars over the same month.
Crypto Briefing’s reported figures put Kalshi’s share of volume among US-regulated platforms at about 83 percent. That measure describes the regulated US segment, rather than necessarily the broader prediction-market landscape.
Volume share and outstanding positions
The headline accompanying the report says Polymarket’s share of prediction-market volume fell to 27 percent. The supplied summary does not specify the denominator for that figure or explain how it relates to the US-regulated platform comparison. The two percentages therefore should not be treated as directly comparable.
Kalshi also had substantially more open interest: about 2.05 billion dollars, against about 384 million dollars for Polymarket US, according to Crypto Briefing. Those figures distinguish outstanding positions from the trading activity captured by monthly volume.
What it means for prediction markets
- Kalshi led the reported US-regulated segment: Its roughly 65 billion dollars in October volume and about 83 percent share indicate a concentration of activity on that platform.
- Market definitions matter: Polymarket’s reported 27 percent share cannot be reconciled with the US-regulated figures from the supplied summary alone.
- Volume and open interest offer different signals: Kalshi’s lead extended to outstanding positions, but neither aggregate measure establishes liquidity or pricing quality in an individual contract.
Sources & attribution
- Published
- Source
- Crypto Briefingcryptobriefing.com
- Publisher
- https://cryptobriefing.com
- Source URL
- The feed did not publish this story's article address.
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 Crypto Briefing”). 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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