Each league has its own subscription plan. When you create a league, it starts on the Free plan. As a league admin, you can upgrade any of your leagues to Pro independently. Members of your league don't need to pay anything.
Yes, you can cancel your Pro subscription at any time. Your league will remain on the Pro plan until the end of the current billing period, after which it will revert to the Free plan.
We accept all major credit and debit cards. Payment processing is handled securely through Stripe.