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API Requests, Last 24 Hours , how to check all api request

SwethaSwetha (Salesforce Developers) 
HI Varun,
You can navigate to System Overview:

Go to Setup | Quick Find System Overview and there you will find the API REQUESTS, LAST 24 HOURS. This shows you how many API calls you've made in the last 24 hours including today. For example, if you are viewing this on Monday at 2:30 PM, it'll show you the calls made since Sunday at 2:30 PM.

User-added image

The "API Usage last 7 days" report
NOTE: 'View Setup and Configuration' permission on your profile is required to see this report.
The 'API Usage last 7 days' report shows you the calls made by user and date for the last 7 days including today. Take into account that the counters for this report reset at 12am Greenwich Mean Time (GMT) or UTC.

Event logging
More on http://www.fishofprey.com/2016/06/monitoring-your-salesforce-api-usage.html

Use Limits from REST API
/services/data/v57.0/limits
Use Event Monitoring to check API Usage

Reference:https://salesforce.stackexchange.com/a/230994/80089

Related: API calls reports and limits FAQ

https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/resources_limits.htm

If this information helps, please mark the answer as best. Thank you