Currency not changing no matter which aggregator I use

Hi there,
In the admin section I have tried 3 different aggregators, with active api keys etc, but all I get is: no data found for USD, I tried with EUR and ZAR as well, so on the frontend when I switch to another currency it just shows as 0. Can you tell me what I may be missing?
Thanks! (I want to purchase the pro version as I need 5 different currencies, but only if Im confident it will work!)