I varies a lot! It is free at times and also as low as 0.30$
When I have had transactions more than 100$, the fees would be around 5$.
It depends on what mode of payment is chosen, if it is GOODS or SERVICES.
Personal payments "Payment owed" used to free. However, that option isn't available anymore in my region.
Fees also varies if your account is Personnal or Business account.
* As low as 1.9% for Express Checkout transactions. The $0.30 USD fixed fee is assessed for each authorization attempt. This includes authorizations, declined payments, and completed transactions..