THE BLOCK: A group of crypto firms — Coinbase, Kalshi, Payward, DRW Holdings, Jump Trading, and Paradigm — asked the court for permission to file an amicus brief defending the CFTC's authority to regulate single-stock perpetual futures in the US. COIN The brief comes in response to a lawsuit by the Capital Markets Alliance Association (members include Cboe and Citadel Securities) seeking to overturn the CFTC's approval of the products. A decision upholding the approvals would help preserve the path for these firms to offer or expand the products onshore.