Stax, a startup that allows Africans to buy airtime, send and request money, and transfer funds between accounts via automated USSD codes, has raised a $2.2 million seed extension round. U.S.-based VC firms World Within Ventures and Noemis Ventures co-led the round with Anthemis Group, Orange DAO, 500 Startups, Garuda Ventures and GAN Ventures participating. […]...