Endpoints found automatically during setup
Alerts when 3x slower than rolling average
Catch failures behind OK status codes
Why API Monitoring Matters
The Hidden Risk
- ✗Silent failures: APIs return 200 OK but serve empty or broken data
- ✗Gradual degradation: Response times creep up until users notice
- ✗Auth failures: Token expiry breaks integrations overnight
- ✗Blind spots: Standard uptime checks miss API-level failures entirely
With Lemwatch API Monitoring
- Body validation catches functional failures behind OK responses
- Degradation detection alerts at 3x rolling average
- Custom headers monitor endpoints behind authentication
- Smart discovery finds your endpoints automatically
Everything You Need to Monitor APIs
From auto-discovery to degradation detection, Lemwatch covers your entire API surface.
Smart Endpoint Discovery
Auto-probes common paths like /api/health, /healthz, and /wp-json during setup. Detected endpoints appear as one-click suggested monitors.
Custom HTTP Methods & Headers
Monitor endpoints behind authentication with custom headers. Support for GET, POST, PUT, HEAD methods with full request configuration.
Response Body Validation
Detect functional failures behind 200 OK responses. Validate that response bodies contain expected keywords or data patterns.
Degradation Detection
Automatic alerts when an endpoint is 3x slower than its 5-check rolling average. Catch performance degradation before it becomes an outage.
Response Time Tracking
Track average and last response times for every endpoint. Identify slow APIs and set custom timeout thresholds up to 30 seconds.
Multi-Channel Alerts
Get notified via email, Slack, Discord, Telegram, or webhooks when endpoints fail. Automatic retry on failed alert delivery.
Integrated with Uptime Checks
API monitoring runs alongside your regular uptime checks at zero additional infrastructure cost. No separate billing or setup.
Consecutive Failure Tracking
Avoid false positives with consecutive failure counting. Only alert after multiple failed checks confirm a real problem.
Endpoints Per Plan
2 per site
$0/mo
10 per site
$19/mo
25 per site
$59/mo
How API Endpoint Monitoring Works
From discovery to alerting in minutes
Add Your Site
Enter your website URL. Lemwatch automatically discovers common API endpoints and health check paths.
Configure Endpoints
Accept suggested endpoints or add custom ones. Set HTTP methods, headers, expected status codes, and body validation rules.
Monitor & Alert
Endpoints are checked alongside your regular uptime monitoring. Get instant alerts when something fails or degrades.
API Monitoring FAQ
Common questions about endpoint monitoring
Monitor Your APIs Today
Smart discovery finds your endpoints. Body validation catches silent failures. Start free — no credit card required.
Explore More
Quick answer
How do I monitor a JSON API endpoint?
Send the real request — method, headers and body — then assert on the status code, the response time and a value inside the JSON, not just that something answered.
- Request control: Custom method, headers and request body
- Assertions: Status code, response time, expected body content
- Discovery: Endpoints can be discovered from the site automatically
- Degradation alerts: Fires when response time drifts from its rolling baseline
How the alternatives compare
Public pricing, checked 2026-09-14. Choose whichever fits — the facts are the same wherever you read them.
| Tool | Free tier | Entry price | Fastest check | Choose it when |
|---|---|---|---|---|
| Lemwatch | Yes — 10 sites | $19/mo | 60s | You want uptime, SSL, DNS, visual and SEO checks in one place. |
| Checkly | Yes | $40/mo | 10s | Your team writes Playwright scripts and wants synthetic API + browser checks in code. |
| UptimeRobot | Yes | $7/mo | 1 min | You only need HTTP/ping uptime checks and want the cheapest paid tier. |