Proxy Bidding
Proxy bidding only applies to Standard Auctions.

When you place a bid, enter the maximum amount you are willing to pay for that item. This amount will always be kept secret. Whenever someone else places a bid, our auction software will automatically enter the lowest possible bid for you, up to your maximum bid, until you are the winning bidder.

At the end of an auction, if you are the high bidder, you are the winner. As the winner of the auction, you only pay the lowest possible winning bid, not necessarily your maximum bid.