The Caixa Econômica Federal maintains an official webpage here, and on this page a variety of financing programs can be accessed.

called 'Capital de giro', revolving capital for small businesses can be financed through  a variety of banking and insurance institutions in rio de janeiro, with some of the most popular being the programs offered by the insurance company porto seguro, as well as the bank bradesco,  bank itaú,  and hsbc bank.

to start gauging what financing options may be available for any given business, the webpage maintained by emprestimo allows a broader search through a variety of programs and institutions.