You can choose the currency in which prices are shown, from the app settings.
The way it works is designed to stay fair to the seller:
- Listings in euros are converted to your display currency to give you a rough idea ;
- Listings in another currency are shown exactly as they are, with no conversion, to avoid any confusion about the real price.
In other words, the price set by the seller always prevails. The currency mainly helps you picture a familiar amount.
Since payment happens directly between you, always agree with the seller on the exact amount and currency before the transaction.