Edix is essentially a scamming tool.
The program works by spoofing your inventory in Rocket League trades, in order to scam the other person in a trade.
For example, you want a white octane from your trading partner. You can use Edix to make your trade offer appear like it has valuable items in it. Your trading partner will see these valuable items in your inventory, but they are not actually there, resulting in your partner offering valuable items in return.