Nx charging Code: 51

Haven't tried it. You can charge a minimum of five dollars, so if you're over 150, try charging five bucks.
If you can't buy nx with it, buy the binding of isaac, it's fucking awesome.

hrmm i wasnt at my limit but your method does work. ty so much.
Since the 150 credit limit is through ultimatepay or watever system that nexon uses; i am pretty sure paying with steam wallet can bypass the 150 limit. I'll update this post when i reach it.