Maltego Search is part of Professional and Organizaiton plans and consumes Credits out of your plan allowance. The specific number of Credits consumed depends on which Transforms are run on the background . You can review the Credit costs associated with different Transforms here. Please note that you need to log in with your Maltego ID to access the Credit costs page.
For customers on legacy plans (Pro and Enterprise) with separately purchased Data Pass packages, searches in Maltego Search will be subtracted from their Data Pass Credit allowance.