The bank is offering a financial incentive for employees who sign up to the plan.
Government backers suggested the bank's scope could be expanded beyond controlling inflation.
The announcement was made Thursday by bank executives in São Paulo, along with representatives of Facebook, Visa and IBM. Banco do Brasil is now in talks to take the service to other platforms, such as LinkedIn and WhatsApp.
The investment community sees chances brightening for a positive outcome with Nafta. Nevertheless, they see business well-prepared for navigating any scenario ahead.
Brazil's largest bank seeks to expand its loan portfolio by up to 4% in 2018.