prediction markets roundup - kalshi reportedly helped set up the november 2024 fbi raid on the apartment of polymarket's ceo, per a new report on the rivalry between the two companies - kalshi added more than 3 million new users during the world cup and hit a record number of trades on its tournament-winner market - hyperliquid unveiled its permissionless hip-4 upgrade, letting outside operators launch and settle event contracts against a 500,000 hype stake - kalshi is looking to expand its air-travel-disruption contracts, letting users trade on things like whether more than half an airport's flights get canceled ahead of a blizzard - prediction markets grabbed an estimated 27% of us sports-betting volume during the world cup, up from 9% at the start of 2026, per h2 gambling capital which update stands out most?