Does it still work?
Yes, it's still working. Soon I'm gonna add more codes. Now last left in stock, you can buy it if you want.
how many codes can be added to an existing account?
also do you accept USDT / USDC or similar payments?
I'm accepting only cryptos.
It should be limited 1 active coupon per account, but I've tried at mine and I was able to add 2 coupons on 1 account. What is more, when you will use all credits from coupon there is no problem to add next and refresh credit, so you're able to run the same instances you had before - there is no need to create new one.