Can I use HTTP monitoring for APIs?

Yes, basic HTTP monitoring works for simple API health checks — it confirms the endpoint is reachable and returns the expected status code. But it won't catch issues like returning the wrong data, slow database queries behind a 200 response, or authentication failures. For anything beyond a basic ping, API monitoring with response validation is more reliable.

Do I need both HTTP and API monitoring?

If you run a web application with a frontend and a backend API, yes. HTTP monitoring covers the user-facing side — can someone load your homepage? API monitoring covers the backend — is your login endpoint working? is your payment flow returning correct data? They catch different categories of failure.

What status codes should I expect from my API?

It depends on the endpoint. GET requests typically return 200. POST requests for creating resources usually return 201. Authentication endpoints might return 200 or 204. The key is to set the expected status code in your monitor to match what your API actually returns when healthy — not just any 2xx.

How often should I monitor API endpoints?

For critical APIs (authentication, payments, checkout), every 1-2 minutes. For internal APIs and non-critical services, every 5 minutes is usually enough. Match the check interval to the business impact of that endpoint being down.

HTTP vs API Monitoring: What's the Difference?

You set up monitoring for your website. The dashboard shows a green dot and "200 OK." Everything's fine, right?

Maybe. That green dot tells you the page loaded. It doesn't tell you whether your login endpoint is broken, your payment API is timing out, or your search returns empty results on every query.

That's the gap between HTTP monitoring and API monitoring. They look similar on the surface, but they catch very different problems.

HTTP Monitoring: Is the Page There?

HTTP monitoring is the simplest form of uptime checking. It sends a request to a URL and checks two things:

Did the server respond? (Or did the request time out?)
Was the status code what we expected? (Usually 200)

That's it. If your homepage returns a 200, the check passes. If it returns a 500 or doesn't respond at all, you get an alert.

What it catches:

Server is completely down
DNS failures
SSL certificate errors
Hosting provider outages
Deployment broke the page (returns 500)

What it misses:

The page loads, but login is broken
The page returns 200, but the content is wrong
A backend service crashed, but the frontend still renders a cached shell
The API behind the page is returning errors that only logged-in users would see

HTTP monitoring answers one question: can a browser reach this URL? For landing pages, marketing sites, and static content, that's often enough.

API Monitoring: Does the Backend Work?

API monitoring goes deeper. Instead of just checking "did the server respond," it validates that your backend is actually doing its job.

A proper API monitor can:

Send requests with specific HTTP methods (GET, POST, PUT, DELETE)
Expect a specific status code (not just any 2xx — exactly 201 for a creation endpoint)
Check response time against a threshold
Validate that the response contains expected data

What it catches (that HTTP monitoring doesn't):

Authentication endpoint returns 401 when it shouldn't
Payment API is timing out while the homepage loads fine
Database is down, causing 500s on data endpoints while static pages still work
Third-party integration failures (payment processor, email service)
Slow queries making your API unusable even though it technically responds

When HTTP Monitoring Is Enough

HTTP monitoring covers you when:

You're monitoring a marketing site or landing page with no dynamic backend
You need a basic "is it up?" check for a service you don't control
You're monitoring third-party services you depend on (your payment provider's status page, your CDN)
You want a simple availability check as a baseline alongside deeper monitoring

If your entire business runs on a static site with no user accounts, no forms, and no API calls, HTTP monitoring is all you need.

When You Need API Monitoring

You need API monitoring when:

Your application has user authentication — can people actually log in?
You process payments or transactions — is the checkout flow working end to end?
Your frontend talks to a backend API — a broken API behind a working page is invisible to HTTP monitoring
You rely on third-party APIs — if Stripe's API is down, your payment flow is broken even if your server is fine
You need to validate response correctness, not just reachability

For most SaaS products, web apps, and e-commerce sites, API monitoring isn't optional — it's where the real failures hide.

Setting Up Both: A Practical Approach

Here's a straightforward monitoring setup for a typical web application:

HTTP Monitors (the basics)

Homepage — GET, expect 200, 2-minute interval
Login page — GET, expect 200, 2-minute interval
Public status page — GET, expect 200, 5-minute interval

API Monitors (the critical paths)

Auth endpoint — POST to /api/auth/login with test credentials, expect 200, 1-minute interval
Health check — GET to /api/health, expect 200, 1-minute interval
Key data endpoint — GET to your most important API route, expect 200, 2-minute interval

What to Set as Your Threshold

Response time thresholds matter more for API monitors than HTTP monitors. A marketing page that loads in 800ms is fine. An API endpoint that takes 800ms to respond will make your entire app feel sluggish.

Set your slow response threshold based on what your users experience:

API endpoints: 500ms is a reasonable upper limit
Web pages: 1-2 seconds before it impacts user experience
Internal tools: More forgiving — 2-3 seconds is usually acceptable

The Real Difference Is What Breaks Without You Knowing

HTTP monitoring tells you when the building is on fire. API monitoring tells you when the plumbing is broken — the kind of problem where everything looks normal from the outside while users are silently hitting errors.

Most outages that damage user trust aren't total server meltdowns. They're partial failures: the login flow breaks, the search returns stale data, the payment endpoint times out for 30% of requests. These are API-level problems that a simple HTTP check will never detect.

Start with HTTP monitoring for visibility. Add API monitoring for the endpoints that matter most to your business. The combination gives you coverage that either one alone can't provide.

Frequently Asked Questions