What I, and probably many of us want, is a way to keep just enough cash in a checking account at a too big to fail bank while the rest is earning yield at Bette

What I, and probably many of us want, is a way to keep just enough cash in a checking account at a too big to fail bank while the rest is earning yield at Betterment, Wealthfront, other 4% or more APR locations, automatically topping off the checking account as needed.