Monitor Your APIs 24/7
Ensure your REST and GraphQL APIs are always available with comprehensive health checks, performance tracking, and instant alerts when issues occur.
Advanced API Monitoring Features
Multi-Step Checks
Test complex API workflows with sequential requests, variable passing, and conditional logic.
Request Validation
Validate response codes, JSON schemas, response times, and custom assertions.
Global Locations
Monitor from 4+ global regions to ensure worldwide availability and performance.
Authentication Support
Support for OAuth, JWT, API keys, Basic Auth, and custom header authentication.
Performance Metrics
Track response times, throughput, error rates, and identify performance bottlenecks.
Smart Alerts
Get notified instantly via SMS, Email, Slack, or webhooks when APIs fail or slow down.
How API Monitoring Works
Configure Your Endpoints
Add your API endpoints with HTTP method, headers, authentication, and expected responses. Set up multi-step checks for complex workflows.
We Monitor Continuously
Our system checks your APIs every 1-5 minutes from multiple global locations. We track response times, status codes, and validate responses against your rules.
Get Instant Alerts
When issues are detected, you receive immediate notifications through your preferred channels. View detailed logs and performance metrics to diagnose problems quickly.
Perfect For
REST APIs
Monitor RESTful APIs with comprehensive validation of:
- HTTP status codes and response headers
- JSON response structure and values
- Response time thresholds
- Rate limits and quotas
GraphQL APIs
Full support for GraphQL with:
- Query and mutation monitoring
- Field-level validation
- Error tracking and logging
- Performance metrics per resolver
Webhooks
Ensure webhook delivery and processing:
- Webhook endpoint availability
- Signature validation
- Retry logic monitoring
- Delivery time tracking
Microservices
Monitor distributed systems effectively:
- Service health checks
- Inter-service communication
- Cascade failure detection
- Dependency tracking
AlertSleep vs. Other API Monitoring Tools
See how AlertSleep compares to enterprise solutions for monitoring your API endpoints.
| Feature | AlertSleep | Datadog | Pingdom |
|---|---|---|---|
| Free plan | ✓ 5 monitors | ✗ | ✗ |
| REST API monitoring | ✓ | ✓ | ✓ |
| Custom headers & auth | ✓ included | ✓ | Limited |
| SMS alerts included | ✓ Basic+ | Extra cost | Extra cost |
| Starting price | $0 / mo | ~$15 / mo | ~$10 / mo |
Frequently Asked Questions
What is API uptime monitoring?
API uptime monitoring continuously checks your REST, GraphQL, or webhook endpoints to ensure they respond correctly. AlertSleep checks every 1–5 minutes and alerts you instantly if an endpoint fails, returns an unexpected status code, or exceeds response time thresholds.
How do I monitor API endpoints for free?
AlertSleep offers a free plan with up to 5 monitors including API endpoint monitoring with 5-minute check intervals. No credit card required. Upgrade to a paid plan for 1-minute checks and more endpoints.
Can AlertSleep monitor authenticated APIs?
Yes. AlertSleep supports Basic Auth, Bearer tokens, and custom HTTP headers, so you can monitor protected API endpoints securely without exposing credentials.
How quickly does AlertSleep detect API downtime?
AlertSleep detects API failures within 60 seconds on paid plans (1-minute interval) and within 5 minutes on the free plan. Alerts are sent instantly via email, SMS, Slack, or webhook.
What HTTP status codes does API monitoring check?
You can configure AlertSleep to treat specific HTTP status codes as success or failure. By default, 2xx codes are treated as healthy and 4xx/5xx codes as failures.
Start Monitoring Your APIs Today
Get started in minutes with our free plan. No credit card required.