That high rate, though, is limited only to balances up to $100,000. Mega Money Market account holders earn 4.40% APY on the first $100,000 they deposit, and then 0.50% on each additional dollar.

If you have idle funds you want to keep accessible, you can still put the money to work earning a great return. We lay out ...

Editor's Note: APYs listed in this article are up-to-date as of the time of publication. They may fluctuate (up or down) as the Fed rate changes. CNBC Select will update as changes are made public.

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a money market account (MMA). An MMA combines high rates of return on your money with a few limited, but useful, benefits of a checking account. These safe, stable accounts offer interest rates ...

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If you're looking to get a better interest rate on your savings, you need to consider opening a money market account. Money ...