Over the past few years, a few online savings accounts have offered some truly wild interest rates, well more than the industry leaders like American Express, Synchrony, CIT, Ally, Barclays, and Marcus that currently pay around 0.60% APY per year.

A few have advertised incredible returns like 3% and 4%. But are they legit?

A new report from CNBC looks at a company called Beam Financial that advertised returns between 2% and 4%, with daily equivalent rates up to 7%, but now is facing angry customers who want to withdraw their money but can’t.

It’s not the first time that a too-good-to-be-true situation has turned out to be just that.

Falling rates push people towards risk

As interest rates climbed a few years ago, so did the yields of online savings accounts, many of which paid well over 2% in interest every year — a great deal for a risk-free and liquid investment guaranteed by the federal government.

And consumers benefited as banks competed with each other to offer generous returns. This spring the Fed slashed rates to zero. Since then, savings account rates have fallen significantly leaving people frustrated and looking for better options.

In 2017, a company called Beam emerged, specifically targeted millennials. It had a long wait list, made longer by ads that advertised daily interest rates of up to 7%. Beam’s interest rate fluctuates and is influenced by how much a user interacted with the account in a gamified way using tokens called “billies” that users get from inviting others to the platform.

“The more you invite, the more you earn,” the website reads. The site also says the money is FDIC insured by “member banks.”

According to CNBC, some Beam customers who want to withdraw money can't, and the company reports problems with partners and vendors, spoiling the promised “24/7 access” customers have to their funds.

The FTC is investigating Beam's marketing and CNBC’s contacts with over 50 of the company’s reported partner banks, reporting that 17 of them said they had no relationship. CNBC also reported that while the banks that the company does work with might be insured by the FDIC, Beam — which is not a bank — is not.

Beam told CNBC that they were having technical errors this month and that the customers were their priority, and they expected a fix "as early as" Oct. 30.

The whole report is a mess and you should read it if you’ve ever been curious about maximizing your rainy day fund’s interest rate, because it underscores the fact that promising upstarts might pay more in interest — if they’re legitimate — but might not offer the umbrella a rainy day requires. Even if the company acted with the best intentions, the system simply isn’t working.