Plasticity APIs that require payment will work until you reach the free tier cap for a particular service.
If you exceed the free tier cap for a particular service and have no payment information on file, requests will fail until you enter your payment information.
You will be billed monthly based on the number of requests made and the pricing schedule for the particular service. All requests are billed at the same CPM rate once you reach each traunch of the pricing schedule.
If at any point your payment information becomes invalid (e.g. expired credit card, etc.), API requests that exceed the free tier cap will continue to work to avoid service disruption to your application. Please update your payment information immediately when this happens to prevent your account from being placed on hold.