Monitoring APIs and Webhooks: A Practical Checklist

APIs fail quietly

A website that is down is obvious. An API that returns a 200 status with a broken payload, or that has quietly slowed to a crawl, can fail for hours while every basic check reports green. Monitoring an API well means checking more than whether it responds.

Check the response, not just the status

Use keyword or content checks so your monitor confirms the response actually contains what it should. A health endpoint that returns 200 but reports a failing dependency should trigger an alert, not a green light. Validate the shape of the response, not only the status code.

Watch latency and dependencies

Track response time on your API endpoints with clear thresholds, since a slow API breaks the products built on top of it. If your service depends on a third party, monitor that dependency too, so you learn about their outage before your customers tell you about yours.

The checklist

For each critical endpoint, confirm you are checking availability, response content, latency against a threshold, and certificate validity. Route confirmed failures to a channel you actually read, and review the checks whenever the API changes. That is the difference between monitoring an API and just pinging it.