Volatility ratings for rebalancing pairs

I’d like to open another rebalancing bot. I have one for ETH and BTC, but I don’t want to add anything to those because I don’t want it selling all my BTC and ETH to rebalance for an alt that severely tanks. True, both of those could crash, but they’re less likely than most.

Is there a site that lets you check the volatility between pairs? I’ve seen a couple of sites in the past that ranked volatility, but they only listed pairs with stablecoins. I’d like to pick two alts that have good volatility between them but also have enough established support that they maybe won’t take a nosedive.