Apifiny said it will give eligible traders perks such as no-fee trading for life on Apifiny HEX order-book trades.
BNY Mellon and State Street join four other firms in backing the platform.
Zac Prince said the average balance of a retail client has climbed from $10,000 to $50,000 in the last year.
Chicago-based cryptocurrency exchange Seed CX, which Bain Capital backed last year, is expanding to Asia via a local partnership.
Institutional trading and portfolio management platform Caspian is launching trading in cryptocurrency derivatives.
Bittrex and invest.com announced that they will partner to launch a cryptocurrency trading platform under the invest.com brand name.
Overstock announced its prototype trading platform on Monday, saying the full product would launch in May.