Inventory Tracking API
Monitor product availability, stock levels, and restock events across retailers and marketplaces in real time.
How It Works
Track product pages
Monitor product URLs for availability status, stock counts, and restock indicators.
Detect changes
Identify when products go in/out of stock, when quantities change, and when new variants become available.
Trigger actions
Build automated alerts, purchasing workflows, and demand forecasting from stock data.
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://retailer.com/product/limited-edition",
"extract": {
"product_name": "string",
"in_stock": "boolean",
"quantity_available": "number",
"variants_available": "string[]"
}
}'Need an API key? — no credit card required.
Related Data Extraction Guides
Inventory & Stock Tracking for a Specific Site
Related Use Cases
Frequently Asked Questions
How quickly can I detect restocks?
Schedule checks as frequently as every few minutes. The API responds in seconds, so you can build near-real-time restock detection for high-demand or limited-edition products.
Can I track stock across multiple retailers?
Yes. Monitor the same product across dozens of retailers simultaneously. AlterLab handles concurrent requests and returns structured availability data from each source.
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.
Scraping Guides & Resources
Best Web Scraping APIs in 2026
In-depth comparison of top APIs by cost, features, and success rates.
Anti-Bot Handling API
Automatic challenge handling for protected sites — works out of the box.
Web Scraping Pipelines for AI Agents
Build LLM-ready data pipelines that minimize token waste and extraction cost.
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