Nearly every bank that does reasonable amounts of commercial services has a product that just does this for you. Googling FDIC sweep account will yield plenty o

Nearly every bank that does reasonable amounts of commercial services has a product that just does this for you. Googling FDIC sweep account will yield plenty of examples. There are also ones that will hold T bills or similar as well. It’s abstracted away from you and trivial to do. These startups just didn’t do it.