Determine the "finders fee" in a wholesale deal

[Hector Caballero]

what would be the best way to determine how much of a fee one will charge as a wholesaler? I'm sure there's plenty of choices so I'm curious to see everyone's input. Would you base it off the purchase price and how much room you have in order to make the sale? All feedback and opinions are welcome as I am a rookie wholesaler just getting my feet wet.