You can trade on stages like RL.Exchange and Rocket League Credits sell or buy Rocket League things you've gained by playing the match and ruling genuine matches.
RL.Exchange will help you bring in some 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...
English
Arabic
Français
Español
Português
Türkçe
Dutch
Italiano
Russian
Romaian