One that uses btc, preferably.
I've been using premsocks since you can pay with btc but I've had more frustrations with their proxies than successes. And they require you to purchase these "plans" which limit both the amount of daily proxies you have access to as well as how many days you can use their service. Also you can only purchase a specific plan once otherwise you have to make a new acc.
I already know about vip72, but I've read that their proxies are most likely blacklisted.
Thanks!
https://anyproxy.net/ ask them for a demo account.