In the first week of January, the company also launched two new tools aimed at providing more insights for traders.
The Treasurys trading platform also named Liz Hogan of Societe Generale as managing director.
The funds will be used to expand OpenDoor's client network and improve connectivity to current users.
The new platform will focus on improving liquidity in specific segments of the US Treasury bond market.
New treasuries platforms want to be alternatives to high-frequency trading.
The company claims it's the first woman-owned bond trading platform.
The all-to-all marketplace looks to help bring liquidity to the US government debt markets.