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US Midterm Election Betting Surges Past $1.4 Billion as Democrats Score Major Wins

  • On Tuesday, nearly $1.9 billion had been wagered on U.S. midterm elections across Kalshi and Polymarket prediction markets as of Monday evening, marking record betting levels for election contracts.
  • Prediction markets have shifted into the mainstream, with Kalshi valued at $40 billion in its latest fundraising round last month and Polymarket at $21 billion in August, reflecting surging institutional backing.
  • Financial technology worker Noah Poser built quantitative models to track dozens of wagers, while Florida State University student Yadin Eldar bets on races he considers "extremely underpriced" for potential 50-55% profits.
  • Legal challenges from a bipartisan coalition of state attorneys general in New York and Utah have alleged the platforms operate as illegal gambling, while Polymarket recently investigated dozens of midterm trades for potential insider manipulation.
  • Industry leaders prioritize "long-term development and credibility" over election outcomes, though critics contend the platforms function as "gambling, just disguised as predictions," raising questions about sustained regulatory acceptance.
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Lean Right

Why is Trump worried about midterms? US midterms will be a great test for forecasting markets. Kalshi and Polymarket, which already add more than $1.48 billion (R$8.13 billion) to electoral bets, need to show that their forecasts are reliable, amidst increasing pressure on the sector. Platforms gained prominence in 2024, when they opposed traditional opinion polls by pointing Donald Trump's victory in the US presidential election. Since then, th…

·Rio de Janeiro, Brazil
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Lean Right

As the U.S. midterm elections began on the 3rd (local time), related platforms are enjoying a boom as trading volume in this year's prediction markets has hit an all-time high. According to an analysis by the Washington Post (WP) on that day, the volume of midterm election-related trading by Americans was tallied at approximately $1.9 billion (about 2.5 trillion won) as of the previous afternoon. Of this amount, $1.3 billion was traded on the pr…

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BizToc broke the news on Monday, November 2, 2026.
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