Website Monitoring API
Detect content changes, track updates, and monitor website availability by scheduling recurring data extractions and comparing results over time.
How It Works
Baseline the target page
Make an initial request to capture the current state of the content you want to monitor.
Schedule recurring checks
Trigger API calls on your preferred schedule — hourly, daily, or weekly — to capture the latest page state.
Diff and alert
Compare extractions programmatically. Trigger alerts or workflows when target fields change.
Quick Start
curl -X POST https://alterlab.io/api/v1/scrape \
-H "X-API-Key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"url": "https://status.example.com/",
"extract": {
"status": "string",
"last_updated": "string",
"incidents": "string[]"
}
}'Need an API key? — no credit card required.
Related Data Extraction Guides
Related Use Cases
Frequently Asked Questions
How do I detect if a specific element on a page has changed?
Use structured extraction with a CSS selector or XPath to target the element. Store the extracted value between runs and compare hashes or values to detect changes.
Can I monitor JavaScript-heavy pages?
Yes. Enable JavaScript rendering to capture dynamic content loaded by SPAs and client-side frameworks. This is essential for monitoring dashboards, status pages, and interactive web apps.
Responsible Use
AlterLab is designed for extracting publicly available data. Always review the terms of service for any website you access, respect robots.txt directives, and ensure your use case complies with applicable laws in your jurisdiction.
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Pricing
From $0.0002/request. No subscriptions. Balance never expires.
Your first scrape.
Sixty seconds.
$1 free credit — up to 5,000 scrapes. No credit card.
Just a POST request.
No credit card required · $1 free credit, up to 5,000 scrapes · Balance never expires