[Coinbase to Launch CHECK and SIGN Spot Trading on April 2] According to TechFlow, on April 1, Coinbase announced that it will officially open spot trading for CHECK (Checkmate) and SIGN (Sign) on April 2, 2026. Specifically, the CHECK-USD and SIGN-USD trading pairs will go live at or after 9:00 AM Pacific Time, with the exact launch time dependent on liquidity conditions being met. The service will only be available in regions that support the relevant trading services.