Search Brazilian companies in the official Receita Federal CNPJ registry. Filters (at least one required): nome (full-text on names, accent-insensitive), uf (state), municipio (4-digit RFB code), cnae, porte (size), abertura_de/abertura_ate (opening-date window YYYY-MM-DD, for newly registered companies), situacao (default "ativa"). Paginated; total capped at "10000+". Free sample, no payment: https://api.brazilayer.com/v1/cnpj/amostra

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