Where are Simple Storage Service and Key Management Service Requests coming from?

Hello. I created a free tier AWS account with the intent of creating a single EC2 instance to deploy a website. The EC2 instance was created, I created a clone repository from Github and used npm to install dependencies. I then ran a server to serve up the site to a port. Afterwards, I stopped the instance and only started and stopped it again once. The instance is currently stopped. This was over the course of 4 days. Since then, I've noticed that my account has been getting an increasing number of Simple Storage Service and Key Management Service Requests in the billing dashboard. I have searched around my account in the site to find the causes. I did not create any S3 buckets (which I associated with the Simple Storage Service). I also do not have any keys. I did search through the Key Management Services section to look. Some of the requests are also in a region I did not create my instance in. After I did my search, the requests increased considerably more to around 100.

My free tier usage has not reached its limits thankfully, but they are starting to get there. Are there any reasons these requests keep appearing? What can I do to stop them or reduce them? Thank you.