API Calls – represents the number of maximum API Calls your account can do per month. Every time you do a request on our API, using your API Key, one API Call is being used from your monthly quota. Each package has a different number of monthly API Calls included.
API Checks (also referred to as Blacklist Check Credits in our documentation) – represents the number of maximum Blacklist Checks that you can perform via the API. For more info on our Blacklist Check API, please see the following article: https://docs.hetrixtools.com/blacklist-check-api/ . Just as with API Calls, every package has a monthly quota of API Checks that can be performed.