Proton is not available on Coinbase. However, we recommend Kucoin for investors that want to invest in Proton XPR. Kucoin supports over 540 cryptocurrencies, and trading costs are quite low at just 0.1%. Investors are eligible for a 20% reduction if they pay using the KCS coin, and high-volume traders can get even lower costs. KuCoin users will appreciate the variety of trading options, including spot trading, margin trading, P2P trading, and futures trading. Users can also employ the borrowing and lending of cryptocurrencies.