I've used many proxy bidding sites to buy items on Yahoo Japan Auctions. Buyee is my favourite! Very easy, in real time, and you don't have to first put a balance in your account and worry about adding more funds if bidding goes higher than expected. Just go ahead and bid, and if you win, they charge you. If you don't win, there's no charge. They have also been extremely accommodating during this Covid pandemic while Japan Post has stopped shipping to certain locations. Charging to fees to have items stored at their warehouse until Japan Post resumes its services. All 5 stars!