Kalshi, Polymarket trading volumes on some products raises questions amid massive growth

Trading volumes for certain products on prediction market platforms Kalshi and Polymarket are raising questions from some industry observers, who fear the numbers may be inflated. On Polymarket, observers have flagged a quirk on the company's international exchange, which is not overseen by U.S. regulators: Markets that feature multiple contracts will see greater activity on those with lower odds of occurring versus those with higher probabilities. It's seen on markets related to elections, sports and central bank decisions. Meanwhile, a user on X on Sept. 20 flagged a strange pattern on Kalshi's perpetual futures market for the ether cryptocurrency.