There are more than 1000 altcoins in the market. What do you think for the most stable altcoins?
Open Coinmarketcap here
https://coinmarketcap.com/All on top 30-40 are stable coins. You will see some movement in ranking, but all have gained value in last 12 months.
Altcoin is quite stable in my opinion is Ethereum. I see this growing Ethereum appear as a coin that is very capable for him to rely on,
both for now and for the future. other than that for Ethereum it is definitely a stable coin and a very reliable coin.