FTX, a cryptocurrency exchange that offers derivatives, options and other sophisticated products, is acquiring a popular portfolio tracking app, Blockfolio. FTX is spending $150 million for the acquisition. But take that price with a grain of salt as it’s a combination of cash, cryptocurrency and stock. Cryptocurrency (and stock) in particular might not be perfectly liquid. While an exchange buying a portfolio tracking app seems to be a right fit, they don’t necessarily have the same audience right now. FTX is better positioned for professional traders as it lets you…