Polymarket vs Kalshi: Copying, Spying, and a Rivalry That’s Getting Ugly Fast

(AsiaGameHub) –   [Paragraph1] The prediction market sector’s rivalry just turned ugly. Polymarket and Kalshi aren’t just competing for users—they’re trading explosive accusations: copying campaigns, office spying, and leaked product timing. This isn’t your typical startup tussle; it’s personal, and every move feels like a direct attack. The tension is palpable, and it’s clear neither side is backing down anytime soon.

[Paragraph2] Polymarket has built an internal file with screenshots of ads, product designs, social posts, and announcements it claims Kalshi copied. Matthew Modabber, Polymarket’s CMO, told the New York Post there are too many coincidences. He says Kalshi’s copying has bad intent and that they’re breathing down Polymarket’s neck. The file is meant to prove Kalshi’s actions go beyond normal competition.

[Paragraph3] The claims don’t stop at copying. Polymarket sources say Kalshi might have moles in their office. They’re also concerned about Paradigm, a VC firm across the street that invested in Kalshi. Polymarket even tinted its office windows to prevent people from seeing their screens. Kalshi and Paradigm denied the spying claims. Jack Such, Kalshi’s spokesperson, called the accusations sad and delusional.

[Paragraph4] Concrete examples fuel the fire. Polymarket planned to give free groceries to 300 Manhattan customers. Nine days before that event, Kalshi ran a grocery promotion with $50 vouchers and an egg price market. Then there’s perpetual trading: Polymarket planned to launch on April21. An hour before, news broke Kalshi was also prepping perp trading.

[Paragraph5] This rivalry exists within a larger legal battle. The CFTC sued Minnesota over a new law that would ban platforms like Polymarket and Kalshi from operating in the state starting August1,2026. The CFTC argues these markets are federal derivatives. Minnesota says the law protects consumers from gambling harm.

[Paragraph6] If this rivalry keeps escalating, both companies could lose focus and cede market share to newer, more agile players.