The Currency Data Feed provides access to the built-in list of currencies.

Note that while the Data Feed is read-only, the built-in list of currencies can itself be manipulated.

This is done via the Layout Manager / Globe Node / Properties, Financial tab.

On this, selecting to use Custom Currencies provides the ability to pull in currency information from a Query (which you configure to pull in data from a Table).

Once this is configured, the data needs to be read from the Query. For performance reasons this is not done every time the data is needed, but only when the Event Action "Reload Currencies" is executed. Typically you configures this on the Record Change Event of the Table containing the currency information that the Query is referencing.