Returns a time series of daily foreign-exchange reference rates between a start and end date, for a base currency against one or more targets.
The series includes working days only. Keep ranges and the target set modest for compact responses.
Range end date, YYYY-MM-DD.
Base currency, ISO 4217 code (e.g. USD). Defaults to EUR.
Range start date, YYYY-MM-DD.
Comma-separated target currencies, ISO 4217. Omit for all.