get_all_currencies      All currency values
get_currency            Get currency values for a given period
get_currency_cross_rates
                        Get currency matrix from BCB
get_series              Get the series from BCB
list_currencies         List all currencies
rbcb                    R interface to Brazilian Central Bank RESTful
                        API
search_series           Search for series in dadosabertos.bcb.gov.br
                        site
