Polymarket saw Iran war bet spike an hour before U.S. strikes began
Newly created Polymarket accounts drove a surge of bets predicting war with Iran roughly one hour before U.S. and Israeli strikes began, according to analyses published by Action on Armed Violence (AOAV) and Byline Times. The UK-based charity is investigating whether traders exploited advance knowledge of military action. The timing has drawn scrutiny over whether prediction markets can be gamed by insiders with classified or operational information.
Insider trading on geopolitical outcomes threatens the core credibility of prediction markets. If participants with advance knowledge of military operations can profit unchecked, traders will price in a hidden information tax and withdraw liquidity. Polymarket now faces parallel reputation risk across its international platform where these contracts traded; its CFTC-regulated U.S. exchange competes with Kalshi and ForecastEx for institutional trust.
The AOAV investigation gives European regulators a concrete fact pattern to justify domestic action, adding to Polymarket's existing Dutch gambling ban. For traders, the concern is sudden platform restrictions or contract invalidation if any regulator deems war markets manipulable by definition. Other platforms will watch whether Polymarket can identify and exclude the suspect accounts before lawmakers demand mandatory surveillance rules that raise compliance costs for every operator.
The suspected front-running on Polymarket follows a pattern of congressional and regulatory scrutiny of prediction-market trading integrity that now encompasses Polymarket traders pricing Hormuz blockade odds, a separate UK MP probe of its bank-failure listings, and multiple congressional investigations.