You are charged based on the cpu and memory on your Logic App. As your Logic App is configured to perform HTTP calls using built-in triggers and actions, you will not get additional charges beyond the fixed costs for cpu and memory. See: https://learn.microsoft.com/en-us/azure/logic-apps/logic-apps-pricing
However, if you use managed connectors however they will result in extra charges.
See: https://azure.microsoft.com/en-us/pricing/details/logic-apps/
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Regards,
Abiola