Key Takeaways Polymarket’s “Imitators” dossier logs roughly a dozen incidents it says show Kalshi copying its launches. Kalshi overtook Polymarket in April 2026 with $5.42B in taker volume to Polymarket’s $1.99B, per Dune. Polymarket tinted its SoHo windows this spring over fears Kalshi backer Paradigm was viewing screens. Tinted Windows and a Rival Across the Street Polymarket has accused its main rival, Kalshi, of corporate espionage, alleging they copied its product launches and may be surveilling its Manhattan offices, per a New York Post report. Having compiled an internal dossier it calls “The Imitators,” logging roughly a dozen incidents it …