Do not capitalize second and subsequent words unless the title is a proper noun (such as a name) or is otherwise almost always capitalized (for example: Canadian "Loonie", but British pound sterling). ... Non-currency units have been decapitalized too, even where they are derived from a proper noun.

Is Sterling a capital letter?

Unless you name your child or your dog Dollar ... Also agreed, even if it somehow seems the name of a currency should be a proper noun. And lest you be tempted, ciggy, it's also "pound sterling" (all lowercase) and "Swiss franc" (uppercase only on the nationality).

Is currency should be capitalized?

Generally, currency is not capitalized, although abbreviations often are: The sticker price was nearly thirty thousand dollars. It was something like 28,495 USD.