On Tuesday, US authorities filed their second significant case against a major crypto participant in two days, arguing that Coinbase’s inability to register as a securities exchange venue exposed investors to risk.

According to the Securities and Exchange Commission, the largest digital currency trading platform in the United States gained billions of dollars by “unlawfully facilitating the buying and selling of crypto asset securities.”

Coinbase shares fell on the announcement of the complaint, which comes on the heels of accusations filed Monday against cryptocurrency exchange Binance and its founder, Changpeng Zhao, for a variety of alleged securities law breaches.