Online brokerage Interactive Brokers Group Inc. is adding four cryptocurrencies to its trading platform that have gained much attention during President Donald Trump's embrace of the digital asset space. Clients will be able to access Solana, Cardano, XRP and Dogecoin tokens on the same platform used for stocks, options, futures, currencies, bonds and mutual funds, according to a statement released Wednesday by the Greenwich, Conn. ,-based company, which already offers trading in Bitcoin, Ethereum, Litecoin and Bitcoin Cash.