If Units can convert between currencies, how does it source the exchange rates? They change on sub-second time scales and bid/ask spreads make the notion of a

If Units can convert between currencies, how does it source the exchange rates? They change on sub-second time scales and bid/ask spreads make the notion of a rate somewhat uncertain. Edit: answering my own question. There are multiple providers, some requiring API-key signup, but the answer is far from definitive: https://www.gnu.org/software/units/manual/html_node/Currency.html https://www.gnu.org/software/units/manual/html_node/Currency...