Zero commitment 4.50% APY lock? It’s a rare double win for savers

An APY guarantee can protect your savings if the Fed continues to cut

For most savers, getting the best return on your money usually means giving up some flexibility. Savings and money market accounts keep your money liquid, but their rates can fall at any time. Meanwhile, certificates of deposit (CDs) guarantee a fixed return, but you have to keep your money for months – or even years – to earn it.

After the Federal Reserve cut interest rates twice this fall, markets widely expect more cuts in the coming months. This means that today’s highest savings and money market rates may not last much longer. Locking in a return — something you can rarely do outside of a CD — has become especially valuable for anyone hoping to enjoy today’s high returns through 2026.

This is what makes Hyperion Bank’s exclusive money market account special. It already tops our daily ranking of the best money market accounts with a leading annual rate of 4.50%. What’s unusual is that the bank guarantees this rate for six months from the date you open your account – an unheard-of feature among liquid accounts.

What do you know about Hyperion Bank’s 4.50% offer?

If you’re wondering what defines a money market account, it’s basically a savings account with a major added feature. Both are offered by banks and credit unions that are insured by the FDIC, or NCUA. They pay variable interest and allow you to move money in and out freely. The difference is that a money market account allows writing paper checks. If this feature doesn’t matter to you, money market accounts and savings accounts are largely interchangeable—just choose whichever pays a higher rate.

Although money market accounts often pay slightly less than high-yield savings accounts, Hyperion’s 4.50% annual rate of return is unusually competitive. While our daily ranking of the best high-yield savings accounts currently stands at 5.00%, the best offers come with strings attached. Only one – Pibank’s 4.60% APY – beats Hyperion’s price without any qualifications. But like the rest of the high-yield savings accounts in our ranking, Pibank’s rate can change at any time.

To get the 4.50% APY, you’ll need to keep at least $10,000 in the account, and only new money is eligible — meaning money not already deposited with Hyperion. Your balance remains fully available, allowing you to deposit or withdraw at any time. Just note that if your balance drops below $10,000, you’ll lose 4.50% APY, so it’s smart to hold bonds above that limit.

Why is this money market account better than the best CDs?

While Hyperion’s 4.50% APY matches the highest CD rate in the country, this higher offer only applies to a four-month CD — meaning Hyperion guarantees your rate for an additional two months. For a real apples-to-apples comparison on rate locks, the best six-month CDs currently pay 4.40%, giving Hyperion’s money market account the edge in terms of yield and flexibility.

It’s a rare combination: a liquid account that pays more than leading CDs while allowing you to withdraw at any time without penalty. For savers looking to lock in a high return that will last well into the new year — regardless of what the Fed does next — Hyperion’s 4.50% guarantee offers the best of both worlds.

How to Find the Best Savings and CD Rates

Each business day, Investopedia tracks rate data for more than 200 banks and credit unions that offer CDs and savings accounts to customers across the country and determines a daily ranking of the highest-grossing accounts. To qualify for our lists, the institution must be federally insured (FDIC for banks, NCUA for credit unions), and the minimum initial account deposit must not exceed $25,000. It is also not possible to determine A maximum The deposit amount is less than $5,000.

Banks must be available in at least 40 states to be eligible to be available nationwide. While some credit unions require you to donate to a specific charity or association to become a member if you do not meet other eligibility criteria (for example, if you do not live in a certain area or work a certain type of job), we exclude credit unions with donation requirements of $40 or more. To learn more about how to choose the best rates, read our full methodology.