question for me to get a node for the us east do I need to pay ?
Picking a node isn’t demands extra payment but WE Mudfish have to pay to third-party supplier when if we increase a new node
mudfish.net/docs/en/policy/pricing.html
I’d set a trial credit now for your account. 
So I think you can use all mudfish nodes and features for a while. Please let me know if there’s any problems and questions.
It seems Lost Ark blocks Mudfish nodes