Hi
There is no fee for you usually on paypal. SEPA depends on your bank, please ask them. On the OSMF side there is a fee of a few % for paypal, which is documented on their web page. The bank charges are rather difficult to predict and are not as well documented.
Regarding currency exchange, for SEPA you will have to ask your bank. For paypal it depends, you could ask your credit card issuer. Alternatively I believe paypal offers to do the conversion, which is displayed when processing the payment.
kind regards
Michael
Membership Working Group