This post isn't only to stop scammers, it's to stop people who aren't scamming from being accused of it. There should be a way or option to trade multiple things at once. Because people are accusing and being accused of scamming for trying to trade two things. For example. If someone wanted to trade 2 red crystals and 1 blue crystal for a purple crystal, they would have to be trusted to give one freely, or the other person would have to be trusted to trade after being given a free item. Well people who are honest traders will be accused of trying to scam if they ask for the first item freely, and people being asked to give the first item freely will accuse the other person of scamming. Bottom line is people should have an option before trading to decide how many different items they would like to trade.