A user with the Modify All Data permission can run the API Usage Last 7 Days report to identify which users and integrations are consuming the most API calls in a Salesforce org. This report is a standard report in the Administrative Reports folder and is available in Salesforce Classic only.
The API Usage Last 7 Days report displays the following columns:
Review the Client Id column to identify automated integrations consuming high volumes of API calls. Review the Name column to identify user-driven API activity. Use this data to determine whether your org's API limits need to be increased, or whether usage patterns need to be optimized to reduce unnecessary API consumption.
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