EIP

Use "Public IP Insights" [new feature] to optimize usage of chargeable public IPv4 address

Public IPv4 addresses will no longer be free. Effective February 1, 2024, Amazon will charge you 0.005$ per public IPv4 address per hour. You will likely soon use "Public

Does a "stopped" EC2 instance cost any money?

There is no charge for a stopped EC2 instance or any data transfer fees. Associated Elastic IP (EIP) addresses and attached Amazon Elastic Block Store (EBS) volumes will incur charges.