At times you'd want to understand in detail how various apps use the Salesforce API. This article explains how to do that step-by-step.
For more about managing Salesforce API, see our article: How to Create a Detailed Salesforce API Usage Report and Manage your API Calls
API Usage Overview
For API usage overview you could go to Setup -> System Overview to see how many API calls have been made in the last 24 hours.
Similarly in Reports -> Administrative Reports the "API Usage Last 7 Days" report shows the calls made by user and date for the last 7 days including today.
API Usage breakdown by App
For granular API usage by app, Event logging can be used.
Here are the steps to get detailed API usage data:
Log into Salesforce Workbench: https://workbench.developerforce.com/login.php (this is a Salesforce tool, see screenshots below)
Go to "queries" and then "SOQL Query"
Issue the following query: SELECT ApiVersion,CreatedById,CreatedDate,EventType,Id,IsDeleted,LastModifiedById,LastModifiedDate,LogDate,LogFile,LogFileContentType,LogFileFieldNames,LogFileFieldTypes,LogFileLength,SystemModstamp FROM EventLogFile
In the "LogFile" column, double-click on the very long string to copy it to the clipboard.
Paste that long string into Base64 decoder (like this tool) and click "Decode" to translate the string to plain text csv format.
Copy the plain text to any text editor and save it as log.csv
Open log.csv in Excel or similar, look at the last column named SOURCE_IP, that's the IP of the app that made the API call.
Aggregate and analyze API calls by date, time, and SOURCE_IP.
Additional Information from Salesforce
FAQ about API usage: https://help.salesforce.com/articleView?id=000003706&type=1
Workbench tool by Salesforce (step 2 above)
Workbench tool query (step 3 above)
Base64 decoding (step 5 above)
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