Is there anywhere to view an audit log of api calls?
I would use Log Adjuster possibly with Hubble.
https://support.solarwinds.com/Success_Center/Orion_Platform/Knowledgebase_Articles/Adjust_logging_levels_with_the_Orion_Log_Adjuster
https://support.solarwinds.com/Success_Center/Network_Performance_Monitor_(NPM)/Knowledgebase_Articles/Turn_on_and_use_Hubble