I'd say it has to be at least 4.5% when other banks are offering that yield and Treasuries between 1 month to 3 years are even higher.
Don't forget the differences in liquidity between savings accounts, CDs, and bonds are important for both what yield is offered and for portfolio planning.
I just tried it with American Express and it's lower. Why is that?
THe APY is the effective interest rate after a year's worth of compounding at the actual interest rate.
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General tip: when shopping for places to park cash, be sure to take the FDIC limits per account holder and per account into consideration. It's not a good idea to have cash intended to have guaranteed availability not covered by FDIC insurance.
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