How to Monitor Third-Party APIs the Simple Way

Third-party APIs power billing, email, maps, and authentication. When one goes down, your app may look broken even if your servers are fine.

Step 1: List your critical endpoints

Write down the URLs that would hurt most if they failed. Examples:

• Payment status or health endpoints
• OAuth or token validation routes
• Webhook receivers you expose to partners

Prioritize the top three to five. Monitor those first.

Step 2: Choose the right HTTP method

Many health checks use GET. Some APIs require POST with a JSON body. Pick the method and payload that matches how your app calls the service in production.

Step 3: Add auth when needed

Protected endpoints may need an Authorization header or API key. Store credentials securely and send the same headers your application uses.

Step 4: Set alert rules

Alert on downtime, slow responses, and unexpected payload changes. Use a false-alert threshold so one flaky check does not wake you at 3am.

Step 5: Send alerts to Slack

Slack webhooks keep the whole team in the loop. One channel for production alerts is usually enough for small teams.

VigilAPI supports GET and POST checks, optional headers, and Slack notifications on free and Pro plans. Add your first API in under two minutes.