Two of the three mentioned altcoins posted double-digit price surges over the past day.XRP, which is up by a more modest 7.5% daily, could see another 20% increase, driving it to $2.7.Dogecoin and Cardano also charted double-digit gains with the potential to reach $0.195 and $0.77 respectively.Positive news and potential approval of a Ripple ETF could serve as catalysts for further gains.