Sharetribe supports up to 24 currencies for the online payment system and you can use dozens of others currencies too, without the online payment system.
Where and how to change the marketplace currency
You can change your marketplace currency from your Admin panel, in the "Online payments / Country & Currency" page.
Once you have connected a payment provider, it isn't possible to change the currency anymore. You can contact Sharetribe's support for help.
How existing listings will be impacted by the currency change
Existing listings will retain their original currency until they are edited. You should advise your sellers to edit their listing to adapt their price to the new currency.
New listings will immediately use the new currency.