Polymarket has introduced five-minute crypto up/down betting contracts on its regulated U.S. platform, operated by QCX LLC under oversight of the Commodity Futures Trading Commission (CFTC). Traders can wager on whether Bitcoin, Ethereum, Solana, or XRP close above or below their starting price within a five-minute window. A correct prediction pays $1 per share; an incorrect one pays zero. The structure resembles binary options and lowers barriers to short-term derivatives trading. The launch arrives amid renewed CFTC scrutiny of Polymarket's compliance with its 2022 settlement terms and customer protection measures on the U.S. platform. Earlier research flagged potential settlement manipulation risks in prior versions of five-minute contracts, prompting the switch to a time-weighted average price (TWAP) settlement mechanism.