Prepaid credits come with all verification tests and allow you to use Manual Mode options, but are missing some features mostly related to our email service provider (ESP) integrations that are only available on paid subscription plans.
The features only available on our subscription plans include Autofloss, Superfloss, the Typo Fixer, Update/Tagging contacts, additional user seats, automated action options, etc.
If you are using our upload tools or our API, you have access to the same verification tests as using an integration.