This article is from the eBay FAQ, by William B. Shaw email@example.com with numerous contributions by others.
No. Not only is it against eBay's terms of service on the U.S. site, it
probably also violates the terms for your payment service (You should check
with the payment service to be sure). With that said, many sellers include
it in their handling fee which is spread out among all buyers and thereby
ok. Laws regarding credit card surcharges may vary from state to state. More
information on credit card surcharges are available at