Why so many Secret Manager API requests?

I recently started to use AWS services and periodically I check the usage quantity of the various resources that I have allocated. My AWS configuration consists of AppSync with a Lambda resolver which interacts with an RDS MySQL DB through a RDS Proxy. While the Lambda authenticates to the RDS Proxy through an IAM role, the authentication between proxy and MySQL database is through a password stored as a secret in the AWS Secret Manager. I am sure that my database has been queried less than 400 times however, in the billing page I see that more than 60000 API requests have been performed to the secret manager. Why so many API requests? Is there a way to monitor the amount of requests destined to the secret manager?