A cryptocurrency dealer for institutional investors and high-net-worth individuals has closed a Series A funding round of $22.7 million. : A cryptocurrency dealer setting out to provide trading services for institutional investors has closed a Series A funding round of $22.7 million. Called SFOX, the platform announced on Thursday that its new equity financing was led by Tribe Capital and Social Capital, and has backing from Airbnb co-founder Nathan Blecharczyk, Y Combinator, Danhua Venture Capital, Digital Currency Group and more. Founded in 2014, SFOX operates as a trading hub for institutional investors, high-net-worth individuals and family offices.