How are you going to give him 400 exact credits? Please explain that to him and I would like to know myself since new members can't offer get it now's.
He can't give you 400 credits unless he win's the auction and then it still might not be 400 credits. The only person that can give you credits is the winner of the auction and the amount of auction was bid up to. If it was to end now, I would only be able to transfer you 75 credits because I am the high bidder, know what I mean?