Some APIs have a rate limit, usually expressed in the number of requests per minute, that you must not exceed when making requests. You can easily configure this in Data Fetcher so that every time a request runs (whether manually run or scheduled), a delay is added and the rate limit is not exceeded.
On the create request screen, click to open the advanced options.
Scroll down to Rate Limit (requests per minute).
Enter the rate limit (maximum request per minute).