API monitoring is a practice that involves observing the functional, availability, and performance metrics of an API to gain visibility and evaluate its availability, performance, response, and functional correctness. This practice helps identify any outages or below-performing APIs that can lead to application, website, or dependent services failure. By providing in-depth visibility into API problems, API monitors help diagnose and solve issues faster before they become apparent to the end-user. API monitoring tools are available in the market, including RapidAPI for Teams, Dotcom-Monitor, Uptrends, New Relic, Amazon CloudWatch, Assertible, API Fortress, Stackify, Smartbear, and others. These tools provide features such as real-time monitoring, API testing, load testing, synthetic monitoring, support for renowned frameworks, deployment tracking, notification via email or SMS, and more. By using these tools, organizations can ensure optimal performance and avoid brand-damaging catastrophes caused by API downtime.