Trading for the primary time will also free up the Rocket League Trading Swap Meet achievement on Steam, presented for trading one or greater objects with any other player in a unmarried change.

As for what you may alternate, monetary transactions aren't authorised. Beyond this, in reality all objects are eligible to trade (from Uncommon and up to Limited). There are some exceptions, along with unique items like the Season 2 Rocket Trails. You can browse your stock for alternate-capable items by means of selecting among categories. 

Keys also are change-able, however with Rocket League Trading Prices one situation: Once purchased, they'll be on hold for trading through a seven-day duration. If you open a crate with stated keys, then the change lock is transferred to the received item. Psyonix additionally states on its internet site that “exchange holds will no longer be lifted under any condition”.