Coinbase has a team of former Wall Street executives building out a business to lure big money into the crypto market. The prime broker business launched earlier this year as Coinbase Prime. But the Coinbase team is working on expanding its services. Prime brokers are commonplace on Wall Street, but don't exist in crypto which is keeping out big money, experts say. Coinbase is best known for being one of the largest venues for mom-and-pop investors in the US to buy cryptocurrencies such as bitcoin and ethereum.