TLDR Kalshi handled $127.4 million in 11 midterm markets early on November 4, more than four times Polymarket’s $30.6 million. Polymarket still captured 51.5% of U.S. prediction-market search demand on Election Day, ahead of Kalshi’s 47.5%. In October, Kalshi ended Polymarket’s 29-month run as the search leader with a 51.8% share. Football combo bets made up 67.6% of Kalshi’s October volume, according to TokenPost data. The year’s biggest search spike came on March 2, shortly after the Iran war began.
Kalshi handled more than four times Polymarket’s trading volume in key midterm markets on November 4. Yet Polymarket drew more U.S. search interest that same day, according to new data from iGaming analytics firm Blask.
The split came one month after Kalshi ended Polymarket’s 29-month run as the top prediction-market brand in U.S. search demand. Blask said the midterms showed how fast consumer attention can move between the two platforms.
Election Day Trading vs. Search
According to Gaming America, Kalshi handled $127.4 million across 11 midterm markets between midnight and 6 a.m. ET on November 4. Polymarket handled $30.6 million in the same markets over that window.
That gave Kalshi about 81% of combined trading volume across the two platforms in those six hours. Democrats secured control of both chambers of Congress that day.
Search data showed a different result. Combined U.S. search demand for prediction-market brands rose to about four times October’s daily average, and Polymarket captured 51.5% of it.
Kalshi took 47.5% of that day’s search demand. It was still Kalshi’s strongest search day of 2026, Blask said.
Blask said the daily figures came directly from each company’s daily index values. It used the same method behind its monthly Brand Accumulated Power figures, which measure each brand’s share of total search demand among tracked rivals.