For the past few months, Blockchain.com - the most popular online wallet(also one of the oldest) is adding more and more crypto assets to its Earn Interest portfolio. This started about 2 years ago with only BTC and ETH, in the beginning, has now grown to be home to 17 different cryptocurrencies that you can earn passive income with. Here is the full list and rates:

The rates are being revised on monthly basis. I cannot confirm if there is a pattern of how they decide if they should change the APR up or down. The initial holding period is just 1 week and after that, if you decide to withdraw your crypto you are free to do so and it will not cost you anything.

I am holding there my Bitcoin and some stable coins earning interest monthly. The best part is that you hold your own private keys for the wallets you have. 

It is important to note that when using the Interest accounts -> the assets will be NOT inside your wallet. This is the same as you keep funds on any exchange - like Binance or Coinbase.

I am currently satisfied with the security they offer.