Hi @ChristianRRL ,

I guess you can more or less estimate cost of directory listing mode. Below it's explained how directory listing works. Then you can grab azure calculator and check what is the price for listing operation and you will obtain some estimation.

https://learn.microsoft.com/en-us/azure/databricks/ingestion/cloud-object-storage/auto-loader/direct...

About tracking cost related to file notification this should be much easier. Just apply tags to resources created by autoloader (i.e storage queue) and you can track the cost from there. This is recommended approach by databricks: 

https://docs.databricks.com/aws/en/ingestion/cloud-object-storage/auto-loader/production#cost-consid...