On Eden AI, you need to buy credits that you can spend to make requests for any features. All technologies are billed with a pay-per-use model and each provider has a specific price.
You have to add your card before you can start buying credits. Once you add your card you can buy credits from the Billing menu.
Select any amount of your choice from the given list and proceed to checkout. Finalize your payment to add the credits to your account. Once done, you can see the credits reflected in your account at the top right corner of your screen.