Get NBRB (National Bank of Belarus) official exchange rates against BYN for USD, EUR, and/or RUB. Supports four modes: (1) latest — most recent rate per currency when no date is given; (2) a single date via `date`; (3) an inclusive date range via `date_from`/`date_to`; (4) weekly/monthly aggregates via `group_by` combined with a range. All rates are denominated in BYN per 1 unit of the foreign currency.
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