Coût par service / Services Cost

The "EC2 - Other" category in your AWS billing refers to various EC2-related services and resources that are not direct EC2 instance usage. This category typically includes:

1. Amazon Elastic Block Store (EBS) charges: This covers costs for EBS volumes and snapshots.

2. Elastic IP addresses: Charges for allocated but unused Elastic IP addresses.

3. NAT Gateway usage: Costs associated with NAT Gateways, which you might see as entries like "EUC1-NatGateway-Hours" or "EUW3-NatGateway-Hours" depending on your region.

4. Data transfer costs: Charges related to data transfer in and out of EC2 instances.

5. EBS-optimized instance charges: Additional costs for using EBS-optimized instances.

To get a detailed breakdown of these charges, you can use the AWS Cost Explorer tool. In Cost Explorer, you can filter by the dimension "Usage type" and select the service "EC2 - Other" to see a more granular view of what's contributing to these costs.

It's important to note that you might see charges in this category even if you don't have any active EC2 instances running, as it includes related services and resources that can exist independently of running instances.
Sources
AWS Cost: "EC2 - Other" | AWS re:Post
Amazon EC2 – Secure and resizable compute capacity – AWS