Just read that commission free trading platform, Robinhood, will launch a new app today allowing users to setup checking and savings accounts with them that will offer 3% interest with no fees or restrictions. It will be considered a brokerage account with SIPC coverage. I've used Robinhood for occasional high frequency trading since 2015 and it has worked exactly as advertised with no issues. This will be an interesting development to watch!
https://www.cnbc.com/2018/12/13/robinhood-goes-after-banks-with-checking-and-savings-accounts.html