Rocket League Items credits for nothing from xingwang's blog

Similarly, you can’t trade credits for credits or Rocket League Items credits for nothing. It has to be credits for an item, and only one player can offer credits.

Once you’ve found a trading partner, link up on the.

 same platform and invite the player to your party in Buy Rocket League Credits Rocket League. Then, select the player and choose Invite to Trade. Once both players have added their trade items and confirmed them, a countdown will begin. You can still cancel the trade during this countdown. Once it’s done, you’ll have your new items.