Tariffic is a callthrough service. To make an international call you will need to call a local (national) number which gets you forwarded to your international target. Calling the local number is charged by your network operator. In case you have inclusive minutes in your plan (or free minutes to national landlines) then this part of your call is free of charge. If not you will be charged a local call by your network operator.
The second part of your call - forwarding your call to your international target - is charged by us through your credits in your Tariffic account.