Catch Errors Before Users
API failures cascade to mobile apps, websites, and integrations. Be the first to know about issues - not your users or customers.
API Monitoring - Get Alerts When Your Endpoints Fail
Your APIs power mobile apps, integrations, and critical business processes. AlertsDown monitors your API endpoints 24/7, checking availability, response times, and status codes. Get alerted instantly when something breaks.
What AlertsDown Monitors
- Availability - is your endpoint responding at all?
- Status codes - catch 500 errors before users do
- Response time - detect performance degradation
- SSL certificates - prevent expiry-related failures
- Check history - review status codes and response times
Why API Monitoring Matters
Track Performance Trends
Response time creeping up? AlertsDown tracks performance over time so you can identify degradation before it becomes an outage.
Verify Status Codes
Track the HTTP status returned by each check so server errors and unexpected status changes are visible in your history.
APIs Are the Backbone of Modern Applications
When your REST API, GraphQL endpoint, or webhook receiver goes down, the impact spreads fast. Mobile apps stop working. Partner integrations fail. Automated workflows break. And you might not know until the support tickets start flooding in.
AlertsDown monitors public API endpoints with checks as frequent as every minute on paid plans. We record whether the endpoint responds, its HTTP status code, and response time so failures are visible in your history.
API Monitoring Capabilities
| Feature | What We Check | Why It Matters |
|---|---|---|
| Endpoint Availability | HTTP/HTTPS requests | Know immediately when APIs become unreachable |
| Status Code Validation | 2xx, 3xx, 4xx, 5xx | Catch server errors and unexpected responses |
| Response Time | Millisecond precision | Detect performance degradation early |
| SSL Monitoring | Certificate expiry | Prevent HTTPS failures from expired certs |
| Check History | Status and response-time records | Review recent availability and performance |
Who Needs API Monitoring?
SaaS Companies
Your customers integrate with your API. Downtime means broken customer workflows and angry support tickets. Monitor proactively to protect your reputation.
Mobile App Developers
Your app is only as reliable as its backend API. Monitor endpoints to ensure your users always have a working app experience.
E-commerce Platforms
Payment APIs, inventory systems, shipping integrations - modern e-commerce depends on dozens of API connections. Monitor them all.
DevOps Teams
Add external API monitoring to your observability stack. AlertsDown provides the outside-in perspective your internal metrics might miss.
Related resources
Compare monitoring tools on our uptime monitoring comparison page.
Route failed endpoint checks to WhatsApp API downtime alerts so the right person sees the outage on their phone.
Learn API incident response tactics in the AlertsDown blog.
Compare plan coverage on the pricing page.
Start Monitoring Your APIs Today
Add a public API endpoint in minutes. Free Builders covers up to 10 monitors with up to 10 email alerts per month; Indie adds Telegram, SMS, and webhooks, while Saas also adds WhatsApp.
API Monitoring FAQ
What types of APIs can AlertsDown monitor?
AlertsDown can monitor any HTTP/HTTPS endpoint including REST APIs, GraphQL endpoints, webhooks, and health check URLs. If it responds to HTTP requests, we can monitor it.
Can I monitor authenticated API endpoints?
Currently AlertsDown monitors publicly accessible endpoints. For authenticated APIs, we recommend creating a dedicated health check endpoint that doesn't require authentication, which is a common pattern for monitoring.
How often does AlertsDown check my API?
Check frequency depends on your plan. Free plans check every 5 minutes, while paid plans can check as frequently as every minute. More frequent checks mean faster detection of issues.
What API response data does AlertsDown record?
AlertsDown records availability, the returned HTTP status code, response time, and connection errors. Response-body assertions and authenticated requests are not currently supported.
How do I get alerted when my API goes down?
Configure alerts via email, SMS, Telegram, or WhatsApp. For critical APIs, many teams use Telegram for instant notifications with SMS as a backup channel for maximum reliability.