The approval of KalshiEX's BTCPERP Bitcoin perpetual contract by the CFTC on May 29 has caused a dispute with CME, leading to the announcement of a lawsuit. CME argues that the contract should be regulated as a swap rather than approved as it has been. This development in the cryptocurrency market indicates a shift in regulatory perspectives. The specific details of the contract and the legal battle are not provided, but this disagreement highlights the complexity and disputes surrounding the regulation of such financial products.