Private trading
I thought of a way totally "legal" do do it.
1. Item for money
Like in the marketplace each item will have a min.-max. price.
The 2 players will have to respect that.
Eg. Player 1 wants to sell a nugget to player 2. The nugget min. price is 5000 and max. price is 50000. Player 2 will have to enter a number between 5000 and 50000, like if it was in marketplace.
2. Item for item
Like in the 1st. part each item will have the same price as the one in the marketplace. The worth of the player 1's item should be the same as the player 2's item.
Eg. Player 1 wants to trade a nugget(5000-50000) for a lvl 1 armor(2000-20000). The trade can be complete because the worth of the 2 items could be the same (5000-20000).
If a player wants to trade 2 or more items the min. price of the first item will be added to the min. price of the second and the same for max. price.
The worth of the player 1's items should be the same as the player 2's items.
I hope you will like my idea
Gab153