Out of all of the coins that go up and down, one small coin has weathered better than a lot of them: XDN.
XDN is a newer coin based on the CryptoNote technology, and it offers some useful technologies, like being able to send encrypted messages (invoices attached to payments, salutes to your friends, etc..), and also XDN owners can lock their money into a deposit for 3, 6, 9 months, and gain a fixed interest.
XRP, Monero is a big brother of XDN, running on the same CryptoNote technology, but I think in the long run XDN will overtake XRP, or at least grow into its own.
XDN has gone from a third of a penny, back before Christmas, up to several pennies per coin, before this slump. It's currently sitting at just about two cents right now.
XDN was a steady pile of coins for anyone who has held onto their pre-slump XDN, providing capital when needed, to purchase other dropping coins, and when the coins go back up, which they ought to be on their way to doing any moment now, XDN is going to make a lot of folks happy.
If you haven't read about XDN's features, you might want to. I'll post a few links below to get you started.
https://coinmarketcap.com/currencies/digitalnote/
https://minergate.com/blog/digitalnote-xdn-a-promising-cryptocurrency-for-mining-in-2018/