Hello. I unlocked xiaomi 14. It was 62dollars. It is working, yes, but I would not recommend that as you have just one shot. If something goes wrong like connection or server will not respond your money is gone. I was forced to use it because the price was 38dollars when I found that tool. So I sent money to the account and waited till the server goes on. But the guy suddenly pushed the price to 62 and I could not get mine money back, as there is basically no support at all from their side. So I had to go along with their business plan and add more money to reach 62dollars and finally I was lucky, server went online and was accepting orders and I was quick. Since the price is same as ncunlock has, I would go with ncunlock, as with him you can be sure you get it unlocked, whereby with xiaomikey you have no guarantee at all.
But here you have a blog, translate it to your language. Some videos about that tool you will find also on youtube.
Update: ncunlock went from 60 to 100dollars!! This is getting absurd