I just mistype a proxy biding price 500$ on an expired domain auction on Godaddy. If the current price is 200$, of cause I'm the top bidder, can I cancel the proxy bidding price?
You can try to place a lower proxy price now,
If success, it means that you have canceled the old proxy price,
If fail, please contact Godaddy Support via phone call, and ask them to help you.