Overall decent platform, just the people behind like support have lots of improvement to do - not to say they suck bad. Support takes ages and sometimes you get messages concerning a ticket from another support member even though ticket is already closed. In addition they dont look left nor right. If you dont have to deal with their stuff it's decent platform, if you have you easily get frustrated in your user experience. In addition their fees are quite decent and postal rate APIs in different countries never seem to be up to date.
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Cardmarket is the no. 1 marketplace for trading cards in Europe.