A free exchange rate provider that uses the Frankfurter API
(https://frankfurter.app/).
Frankfurter is a free, open-source currency data API that
tracks reference exchange rates published by institutional
and non-commercial sources like the European Central Bank.
No usage caps or API keys. Works great client-side in the
browser or mobile apps. The public API is available at
api.frankfurter.dev. If preferred, you can self-host.
