I think we cannot regard the price is stable in price but on the investment purpose, currently there are stable coins, which stable coins means that to the coin is pegged with another stable assets, for example like the Tether(USDT) and basecoin are 1:1 with the USD, but they have a different working approaches.

I concern about the stability on price, so for me Bitcoin is not; understanding that Bitcoin has already got a mature development, it is more trust-worthy for the investment than most of the altcoins