The most popular currencies in the world are already included in the script you will download. Each visitor can set an individual currency setting for his view - prices will be automatically converted for him. You will be able to add as many additional currencies* to your Pintastic based marketplace as you need, and the conversion rates can be set manually or automatically.
*Please note currencies are displayed for price comparison purposes only. The currencies usable for actual payment will depend on the payment processor you are using (default is PayPal).