Brazil Central Bank Open Data vs EPA

A CKAN-based open-data catalogue from Banco Central do Brasil covering 4,200+ datasets — exchange rates, interest rates, public debt, and other monetary time series. Dataset metadata is browsable via the standard CKAN Action API, and most series resolve to the Central Bank's SGS (Sistema Gerenciador de Séries Temporais) endpoints, which return JSON or CSV for a specified date range with no key required.

EPA's Envirofacts platform exposes the agency's environmental compliance and monitoring databases — air quality, drinking water systems, the Toxics Release Inventory, hazardous waste, and Superfund sites — through a keyless REST API at `data.epa.gov/efservice`. Any of the underlying tables can be queried by building a URL from the table name, filter columns, and an output format, with results returned as JSON, XML, CSV, or Excel. EPA's Developer Central site separately documents smaller topic widgets built on the same data.