Why API Monitoring Is Critical
Modern applications depend on APIs — both your own and third-party services. An API outage can break your entire application, even if your web server is running. API monitoring ensures that every dependency your application relies on is healthy and responding correctly.
What to Monitor
1. Health Check Endpoints
Most APIs expose a /health or /ping endpoint. Monitor these with simple GET requests. Expect 200 OK with minimal response time. These are your first line of defense.
2. Critical Business Endpoints
Monitor endpoints that power core functionality: authentication, payment processing, search, and data retrieval. Use POST requests with test data for write endpoints.
3. Third-Party API Dependencies
Monitor external services you depend on: payment processors, email providers, CDNs, and authentication services. Know when they're down before they affect your users.
Monitoring Best Practices
- Use content matching — Verify that response bodies contain expected strings. Detect hacked or misconfigured endpoints.
- Set response time thresholds — Alert when TTFB exceeds your baseline. Track trends to catch gradual degradation.
- Monitor from multiple regions — Regional CDN failures won't show if you only check from one location.
- Rotate auth tokens — Set up monitoring with long-lived tokens or rotate them regularly to prevent false alerts from expired credentials.
- Use different HTTP methods — GET for reads, POST for writes. Match the method your application actually uses.
- Check status codes carefully — A 200 on a health endpoint is good. A 200 on an error endpoint might indicate a problem.
Setting Up in UptimePoint
Creating an API check in UptimePoint takes seconds:
- Go to your dashboard and click "Add Site"
- Enter your API endpoint URL
- Select the HTTP method (GET, POST, etc.)
- Add custom headers for authentication (Authorization, X-API-Key, etc.)
- Optionally add a request body for POST/PUT requests
- Set up content matching to verify expected responses
- Configure alert thresholds and notification channels
Frequently Asked Questions
What should I monitor in an API?
Monitor HTTP status codes (expect 200 on health endpoints), response time (alert on >500ms), response body content (verify expected JSON structure), SSL certificate validity, and DNS resolution. For authenticated APIs, also verify that authentication tokens work correctly.
How do I monitor an authenticated API?
Use custom headers to pass authentication tokens. In UptimePoint, configure your check with custom HTTP headers like 'Authorization: Bearer <token>' or 'X-API-Key: <key>'. Rotate tokens before they expire to avoid false alerts.
What is a good API response time threshold?
For most REST APIs, a TTFB under 200ms is excellent, 200-500ms is acceptable, and over 500ms should trigger an alert. For health check endpoints, aim for under 100ms. Set your thresholds based on your API's actual performance baseline.