Five Months Old, $14.9 Billion in a Month: Polymarket US Arrived
Polymarket US launched on May 27, 2026. In October alone it traded $14.9 billion in contracts, its biggest month yet and roughly 40 percent of the $36.9 billion it has handled in its entire life. The regulated US arm is no longer a pilot. It is a market.
The last 30 days tell the story: $14.6 billion in contracts traded, $3.4 billion in dollars actually paid, across 10.9 million trades. That is up 62 percent from the 30 days before, good for a 12 percent share of all prediction-market volume, second only to Kalshi at 76 percent, while its international sibling holds 4 percent.
The peak came on October 24, a record $811 million day, inside a record $4.1 billion week from October 23 to 29. October 31 closed at $669 million, still 83 percent of that record. Open interest ended October at $77 million, up 233 percent in 30 days, and traders now work an average of 13,000 markets a day at an average trade of $315.
Sports did the heavy lifting, $14.3 billion of the 30-day total, but the fastest growth sits elsewhere: crypto volume rose 212 percent to $165 million and weather rose 154 percent to $34 million. A five-month-old exchange just posted a month most venues never reach. The question for November is no longer whether Polymarket US belongs. It is how much of Kalshi's 76 percent it takes next.
Sources & attribution
- Published
- Source
- DeFi Ratedefirate.com
- Publisher
- https://defirate.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 DeFi Rate”). 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.