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Federal Reserve Economic Data (FRED) API

fred_load	Get the observations or data values for one or more economic data series.
fred_search	Get economic data series that match search text.
fred_set	Set one (or more) parameters for a given FRED API call.

DBnomics (macro-economic data) API

dbnomics_series	Respond a list of series found by IDs, belonging potentially to different providers and datasets.
dbnomics_set	Set one (or more) parameters for a given DBnomics API call.