You know that there are many accounts with over 5% APY return, but this is the first with $100 bonus with no fees whatsoever.
You need at least 10K to fund your account. Here is the $100 bonus sign-up page.
Open the account and deposit your money into the 5.15% Select Money Market Portfolio FSLXX.
You can also earn 25K miles by signing up this United Mileage Plus Miles Card.
Why not apply this American Arline AAdvantage Miles card for another 25K miles.