Amazon DynamoDB Accelerator (DAX) pricing

DynamoDB charges for DAX capacity by the hour and your DAX instances run with no long-term commitments. Pricing is per node-hour consumed and is dependent on the instance type you select. Each partial node-hour consumed is billed as a full hour. Pricing applies to all individual nodes in the DAX cluster. For example, if you have a three-node DAX cluster, you are billed for each of the separate nodes (three nodes in total) on an hourly basis. 

There is no charge for data transfer between Amazon Elastic Compute Cloud (Amazon EC2) and DAX within the same Availability Zone. Standard Amazon EC2 data transfer charges apply when transferring data between an Amazon EC2 instance and a DAX node in different Availability Zones of the same AWS Region. However, you are charged only for the data transfer into or out of the Amazon EC2 instance. There is no DAX data transfer charge for traffic into or out of the DAX node itself.

Note that DAX T3 instances run in unlimited mode, which means that you will be charged if your average CPU utilization over a rolling 24-hour period exceeds the baseline of the instance. CPU credits are charged at $0.096 per vCPU-hour. The CPU credit pricing is the same for all T3 instance sizes across all AWS Regions.