RL.Exchange will help you bring in some Rocket League Credits significant cash by trading with various players for things that you presumably will not need or you're expecting to make an advantage from them. 

A couple of things worth stores of cash, and various players would offer anything to have them. 

You can trade a wide scope of things like vehicles, supports, decals, wheels, target celebrations, etc Anything found in-game is available for trading on stages like RL.Exchange and can make you more Buy Rocket League Credits luxurious.