The fluctuation in price can be tracked in the same way you can track any other stock in your portfolio. The online exchange supports multiple currencies and even more digital currencies, including bitcoin, ethereum, ethereum classic, litecoin, ripple, bitcoin cash, and many fledgling cryptocurrencies you may not have heard of. TZero, which announced an exciting Initial Coin Offering ICO earlier this year, is offering a general ledger system for capital markets using cryptocurrencies.