Many startup business accounts now offer interest on idle cash, often with APYs...

https://becketteulj000.cavandoragh.org/rho-vs-brex-for-card-rewards-which-one-is-better-for-startups

Many startup business accounts now offer interest on idle cash, often with APYs higher than treasury yields. But keep FDIC insurance limits in mind—the standard $250,000 cap applies per bank