Alexa Integration Charges

Hi guys. I’m not NabuCasa cloud user and I was setting Alexa integration through home assistant custom guide Amazon Alexa Smart Home Skill - Home Assistant. It should be free of charge right, but I got charges from Amazon using their aws service, to be specific Amazon Route 53 Hosted zone as shown in the picture below.

I have look through the pricing from Amazon Route 53 pricing - Amazon Web Services however, Im still not clear about the hosted zone. Anybody can provide some clarification? Thanks in advance!

strange, I checked my account and all months are $0 costs.