Returns the foreign-exchange reference rates that were published on a given date, for a base currency against one or more targets.
Rates are published on working days only; requesting a weekend or holiday returns the most recent prior publication. History reaches back decades.
Base currency, ISO 4217 code (e.g. USD). Defaults to EUR.
Date in YYYY-MM-DD format.
Amount of the base currency to convert. Defaults to 1.
Comma-separated target currencies, ISO 4217. Omit for all.