Robinhood Markets said on Wednesday it has partnered with crypto firm Circle to provide customers the option to trade stablecoin USD Coin (USDC) on the brokerage's platform. USDC, the second-largest stablecoin with over $50 billion in circulation, is the first stablecoin to be listed on Robinhood Crypto. With this, the number of cryptocurrencies on the app stands at 17.