âWatershed momentâ as Coinbase IPO widens crypto investor pool Weâre sorry, this service is currently unavailable. Please try again later. Dismiss Save Normal text size Advertisement The public listing of cryptocurrency exchange Coinbase, with an expected valuation of $US100 billion, will open the door to more investors riding the bitcoin wave without having to directly buy the digital currency. Coinbase is the largest US-based cryptocurrency exchange, used by 56 million people to buy, sell and trade cryptocurrencies. Its IPO comes amid a surge of interest in cryptocurrencies, ...