If your vendor is selling in a different currency from yours in their e-commerce store, you can set up currency exchanges to be automated in Jetti. This will allow for prices to be converted to your store's currency.
First, set up all your different currencies exchange rates using either fixed exchange rates or live exchange rates from the European Central Bank that will be updated daily. There is also a round-up feature if you want prices to be rounded up to the nearest whole number.
Second, map any vendor inventory feeds to the correct currency under their Inventory Settings. Inventory -> Inventory Feeds -> Inventory and Prices tab -> Pricing Sync -> Currency and select from the dropdown any of the currencies you set up in the previous step.
Third, click "Sync Retail Prices" for the changes to sync through:
This can take a while, but you will then see your vendor's currency in the inventory feed, and in the general inventory section you'll see the converted prices that should appear in your store.