Monthly Credit buy Modal

https://featurebase.venice.ai/p/create-a-dollar30month-plan-for-automatic-monthly-credit-refill  is there, but its set to 30/month.

my thought (another user in discord asked for something around $18/month.

modal, auto monthly buy of credits,  User can select from a few diff amounts. (like the sub modal)  but its diff amounts. say $10/18/30/50/?custom?   (minimum buy is the lowest amount selectable.

Thanks