Maybe if you set up a shop you can make a tradebot. It might take a long time to explain. So to craft a tradebot you need 5 brass 1 copper and a blue crystal. Once you place it, you drag an item to it and then this screen pops up asking what you'll take for this item. Ex. You drag a blue crystal and then a screen says please search up what you'll take for this item then you search it up and tap on lets say a gun turret then anyone who comes by will tap the tradebot and then it says blue crystal then if you tap it it says trade for gun turret. Just like protectors, you can decide if you let friends use your trade bot too. You can also put multiple items that you'll take for the item. This way it'll make it more efficient to run a shop when your not there.