Many APIs implement a rate limit to prevent abuse of public APIs. When you have publicly exposed APIs, you will need to control the amount of traffic hitting the service and prevent abusers from slowing down or stopping your service.

The Rate Limiter module implements multiple ways to control access to your public APIs. There is an option to control the rate limit on specific requests, IP address-based limiting, and IP whitelisting.

You can find the Rate Limiter module at https://www.drupal.org/project/rate_limiter.