Question: Why is AWS DynamoDB charging me?

Answer

In addition to any optional functionality you decide to activate, DynamoDB charges for reading, writing, and storing data in your DynamoDB tables. On-demand and provisioned are two capacity modes DynamoDB offers unique billing choices for handling reads-writes on your DynamoDB tables. It is a true serverless option because you are only charged for your usage and do not need to worry about scaling.

The on-demand capacity solution is ideal for autoscaling if you are still determining the expected traffic volume. The first step in reducing your expenditures with DynamoDB is determining which capacity best meets your needs. Hereafter, you can use the provisioned billing model to provision throughput for your database.