Polymarket Accuses Rival Kalshi of Copying Product Launches in Escalating Predictive Markets Feud

Predictive markets platform Polymarket has accused competitor Kalshi of systematically copying its product launches, alleging a pattern of imitation that includes suspiciously timed market moves and even potential physical surveillance. The New York-based firm compiled an internal dossier titled "The Imitators" documenting twelve instances where Kalshi allegedly mirrored its initiatives.

The rivalry intensified in April 2026 when Kalshi surpassed Polymarket's trading volume with $5.42 billion compared to $1.99 billion. Notable coincidences include near-identical marketing campaigns—Polymarket's February 12 free food distribution in New York preceded by Kalshi's discount voucher campaign nine days prior—and simultaneous announcements about perpetual futures contracts.

"There were a few too many coincidences," said Matthew Modabber, Polymarket's marketing director. Kalshi and investor Paradigm dismissed the allegations as "delusional" and "laughable." The conflict highlights the increasingly competitive landscape of prediction markets as platforms vie for dominance in this emerging financial sector.