I just know that Etc are going to add but XRP are totally risk. XRP team have reserved 70% persent coin,If they sell those coin, all XRP's coin price will going down.And other thing that they are control their price.
LINK : https://techcrunch.com/2018/06/11/coinbase-will-add-ethereum-classic/
LINK : https://blog.coinbase.com/adding-ethereum-classic-support-to-coinbase-becb9a337e9c
LINK : https://techcrunch.com/2018/06/11/coinbase-will-add-ethereum-classic/
LINK : https://blog.coinbase.com/adding-ethereum-classic-support-to-coinbase-becb9a337e9c