Plugin for Paid Subscriptions for certain Roles!

So basically the past few days I have been looking for a plugin that allows a user to purchase a User Role on wordpress. I have seen many plugins that allow you to deny access to pages but my plan is to use the user role editor to allow you to be able to purchase a higher role in order to have your posts auto approved.

So like lets say you pay 5 dollars a month or something and you become a Contributor instead of a Subscriber.

If anyone could point in the right direction I would be very greatful!