Smart Rendering API
Automatic website compatibility for JavaScript-heavy and dynamically rendered pages. AlterLab's smart rendering pipeline selects the right approach for each URL — from simple fetch to full browser rendering. From $0.0002/request, no monthly subscription.
Simple API, Powerful Results
Get started in minutes with our intuitive API. One request gives you structured data, screenshots, PDFs, and more. No browser management, no infrastructure headaches.
Multi-Format Output
Markdown, JSON, HTML, text
Adaptive Rendering
JS, SPAs, shadow DOM
3 Lines to Integrate
Any language, any stack
Up to 5,000 free scrapes included. No credit card required.
How the Smart Rendering Pipeline Works
AlterLab automatically selects the right rendering approach for each URL — no configuration needed.
Site Compatibility Analysis
When you send a URL to the AlterLab API, the system first analyzes the site's rendering requirements. Some sites serve complete HTML immediately; others require JavaScript execution, cookie handling, or challenge resolution. AlterLab detects these requirements and routes the request to the most efficient rendering tier automatically — no manual configuration needed.
Adaptive Request Handling
AlterLab crafts each request to match the expectations of the target site — appropriate headers, HTTP/2 framing, and request timing that matches real browser behavior. This ensures high compatibility with modern web infrastructure, including CDNs and edge services that validate request characteristics. See our technical deep-dive on browser compatibility for details.
Full Browser Rendering
For sites that require complete JavaScript execution — single-page applications, infinite scroll pages, or sites with interactive content — AlterLab escalates to a full headless browser environment. The browser renders the page in a real Chromium instance with residential proxy IPs and accurate viewport settings, ensuring JavaScript-dependent content is fully loaded before returning the HTML.
Automated Challenge Resolution
Some sites present interactive verification steps before serving content — image selection tasks, audio challenges, or puzzle-based checks. AlterLab automatically handles these verification steps using AI-powered solvers. Challenge resolution only activates when detected, keeping costs low. You send a URL and receive clean HTML content — the full pipeline runs transparently.
Automatic Tier Escalation
Starts with the fastest approach, escalates only when needed. Pay only for what works.
Automatic Tier Escalation
Starts with the fastest approach, escalates only if needed. Pay only for what works.
Challenge Resolution
Automatically handles interactive verification steps using AI-powered solvers.
Full Browser Rendering
Real Chromium rendering for JavaScript-heavy and single-page applications.
Residential Proxies
Rotating residential IPs included. No proxy management.
Why Use AlterLab Instead of Building Your Own Pipeline
Building a reliable web data extraction pipeline is possible — but it comes with hidden operational costs.
DIY Rendering Pipeline
- ×Maintain proxy pools across multiple providers ($200+/month for residential IPs)
- ×Update request handling as web infrastructure evolves
- ×Manage headless browser infrastructure (Puppeteer/Playwright clusters)
- ×Integrate challenge resolution services separately
- ×Debug constantly as site rendering requirements change
AlterLab Smart Rendering API
- ✓One API call handles everything — no proxy management, no browser infrastructure
- ✓Always up to date — AlterLab updates rendering capabilities automatically
- ✓Pay-per-request from $0.0002 — no monthly subscription or minimum commitment
- ✓Built-in challenge resolution, residential proxies, and full browser rendering
- ✓High compatibility across static, dynamic, and JavaScript-heavy sites
At 10,000+ requests per month, the engineering hours spent maintaining a DIY rendering pipeline far exceed the cost of an API. AlterLab handles the constantly evolving web rendering landscape so you can focus on extracting and using the data. See how AlterLab compares to other web scraping APIs on price, features, and success rates.
Reliable Data Extraction Across Industries
High compatibility with dynamic and JavaScript-rendered websites across verticals.
E-commerce Data
Extract product data, pricing, and inventory from dynamic retail sites
Price Monitoring
Track competitor pricing from JavaScript-rendered product pages
Travel & Booking
Scrape flight prices and hotel rates from dynamic booking sites
Financial Data
Extract stock prices and financial data from complex web applications
Most Cost-Effective Solution
Only pay for the rendering tier needed for each URL.
Why Teams Switch to AlterLab
Smart routing, no subscriptions, balance that never expires
| Feature | AlterLab You are here | ScraperAPI | Bright Data | Firecrawl |
|---|---|---|---|---|
Avg cost (real workload) Smart routing vs flat rate | ~$0.001 | $0.00049/credit | $0.0015 | $0.0063 |
Simple scrape Basic HTTP request | $0.0002 | $0.00049 | $0.0015 | $0.0063 |
JS rendering Full browser render | $0.004 | $0.0049 | $0.0015 | $0.0063 |
Free tier Free requests to start | Up to 5,000 scrapes | 5,000 credits | None | 500 scrapes |
Minimum Smallest purchase | $10 one-time | $49/month | $0 (PAYG) / $499/mo (subscription) | $19/month |
Balance expires? Does unused balance expire | Never | Monthly | Never (prepaid) / Monthly (subscription) | Monthly |
CAPTCHA solving Built-in CAPTCHA bypass | $0.02/solve | Extra cost | Extra cost | Not available |
Avg cost based on typical content/SEO workload (75% simple, 25% protected). Competitor prices from public pricing pages, March 2026.
Frequently Asked Questions
Anti-Bot Handling Guides
How to Handle Cloudflare Bot Protection
All 6 detection layers explained: TLS fingerprinting, JS challenges, Turnstile, and more.
How to Scrape DataDome Protected Sites
DataDome ML scoring, sensor data, and the datadome cookie trust system explained.
How to Scrape PerimeterX / HUMAN Security Protected Sites
BotGuard sensor data collection, _px3 cookie, and behavioral ML detection guide.
Bot Protection Comparison: Cloudflare vs DataDome vs PerimeterX
Side-by-side comparison: detection mechanisms, challenge complexity, and cost per tier.
Your first scrape.
Sixty seconds.
$1 free balance. No credit card. No SDK.
Just a POST request.
No credit card required · Up to 5,000 free scrapes · Balance never expire