In the fast paced digital world, to enhance the functionality of a website it’s quite common to integrate with a third party app or service making use of ‘application programming interface’ or APIs. However, it is the rare online business that thinks about website monitoring services capability to monitor API, when they integrate with third party apps.
Source: https://www.alertra.com/articles/website-monitoring-essential-sites-using-third-party-api%E2%80%99s