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There are some in the 'dark web' - such as 'silk road' that was shut down a while back - but from what I understand they aren't for 'normal' use in general. Maybe there will be a full crypto trade site at some point in the near future!

Yeah the sites are present on the darkweb but they are mainly used to sell illegal things like drugs or guns but I think there should be a site on the normal web on which people can sell their old or used things for cryptocurrency!