Trading in-game items for anything outside of the game and vice versa is strongly discouraged. Taking part in this kind of exchange risks both your items' and account's security,and there is no way for us to guarantee a safe environment for such trades.
Moreover, please be aware that trading game items for real money within and outside the game is not allowed, and thus will result in a permanent suspension of your game account. You will not receive any kind of assistance from the Customer Support Team in case any participating account loses items, get compromised, or in any other way get impacted by this kind of transaction.
For trading items completely outside of the game such as merchandise, art commissions, etc., as long as these items are original creations, and do not infringe any copyright laws, i.e. using any official Growtopia sprites, assets, and designs, you are free to sell them for real-life currency and will not, in any way, result to suspension of your account. However, as this is happening completely outside of the game, we will not offer any kind of assistance in case any issues arise.