Wholesale charging me his fee?

[Rick Cardenas]

I was about to get my first fix and flip under contract with a wholesaler. I negotiated the deal for $55,000. My wholesaler sent me the purchase agreement and his assignment contract, but I noticed he has me (buyer) paying him a $5,500 fee. We never discussed this at all, and I assumed the fee would have been baked into the sales price we agreed upon. Since this is my first time dealing with a wholesaler, I dont know if this is normal. Can someone experienced with wholesalers please advise? Thank you!