Banco Central do Brasil — SGS

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official Banco Central do Brasil time-series API (SGS, Sistema Gerenciador de Séries Temporais). path pattern /dados/serie/bcdata.sgs.{id}/dados returns {data, valor} observation pairs — series 432 is the Selic target rate — with /ultimos/N for the last N points. the open-data portal spans thousands of series (rates, FX, credit, Pix), some back to 1984, in JSON/CSV/XML.