If your store view allows retailers to purchase in multiple currencies, the extension will automatically begin using the exchange rates. From version 2.10.0 you can also disable multi currency features and Nosto will not try to do any currency conversions for product prices. If your store view allows purchases only in one single currency you can set the multi currency method to be "Single currency" and Nosto will convert all product prices to that currency using the exchange rates saved in Magento.