AlterLabAlterLab
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    AlterLabAlterLab
    PricingComparePlaygroundBlogDocsChangelog
    IntroductionQuickstartInstallationYour First Request
    REST APIJob PollingAPI KeysSessions APINew
    OverviewPythonNode.js
    JavaScript RenderingOutput FormatsPDF & OCRCachingWebhooksJSON Schema FilteringWebSocket Real-TimeBring Your Own ProxyProAuthenticated ScrapingNewWeb CrawlingBatch ScrapingSchedulerChange DetectionCloud Storage ExportSpend LimitsOrganizations & TeamsAlerts & Notifications
    Structured ExtractionAIE-commerce ScrapingNews MonitoringPrice MonitoringMulti-Page CrawlingMonitoring DashboardAI Agent / MCPMCPData Pipeline to Cloud
    PricingRate LimitsError Codes
    From FirecrawlFrom ApifyFrom ScrapingBee / ScraperAPI
    PlaygroundPricingStatus

    AlterLab API Documentation

    AlterLab is a web scraping API that bypasses Cloudflare, DataDome, PerimeterX, Akamai, and Kasada in a single API call. It returns clean HTML, LLM-ready markdown, or structured JSON from any URL.

    The API uses a 5-tier auto-escalation system: Tier 1 (Curl, $0.0002/req) for static sites, Tier 2 (HTTP, $0.0003/req) for TLS-fingerprinted requests, Tier 3 (Stealth, $0.002/req) for anti-bot bypass, Tier 4 (Browser, $0.004/req) for JavaScript rendering, and Tier 5 (Captcha, $0.02/req) for CAPTCHA solving. Official SDKs are available for Python and Node.js. Pay-as-you-go pricing with no monthly subscription — balance never expires.

    The AlterLab dashboard gives you an at-a-glance view of your API usage, recent jobs, and account status.

    New to AlterLab?

    Start with our Quickstart Guide to make your first API request in under 5 minutes.

    Getting Started

    Installation

    Install the SDK in your preferred language and set up your environment.

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    Your First Request

    Make your first API call and scrape a web page in under 2 minutes.

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    REST API Reference

    Complete reference for all API endpoints, parameters, and responses.

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    Python SDK

    Official Python SDK with async support, batch operations, and type hints.

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    Guides

    JavaScript Rendering

    Scrape SPAs and dynamic sites with headless browser rendering.

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    PDF & OCR

    Extract text from PDFs and images with multi-language OCR support.

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    Caching

    Reduce costs with intelligent caching. Cache hits are free.

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    Webhooks

    Get notified when async scrapes complete with webhook callbacks.

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    JSON Schema Filtering

    Filter extracted data to match your desired output structure with aliases and type coercion.

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    Batch Scraping

    Submit up to 100 URLs in a single API call with async processing and webhooks.

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    Scheduler

    Automate recurring scrapes with cron expressions and balance-based limits.

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    Authenticated Scraping

    Scrape login-gated content with your own session cookies. Member pricing, paywalled articles, and more.

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    Tutorials

    Structured Extraction

    Use AI to extract structured JSON data from any web page.

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    E-commerce Scraping

    Scrape product data, monitor prices, and track inventory.

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    News Monitoring

    Build news aggregation and brand monitoring systems.

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    Reference

    Pricing

    Tier costs, add-ons, BYOP discounts, and concurrency limits.

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    Rate Limits

    Quotas, payload limits, timeouts, and how to handle 429 errors.

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    Error Codes

    Complete list of error codes with troubleshooting tips.

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    API Keys

    Manage API keys, permissions, and security best practices.

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    Quick Links

    Interactive Playground

    Test API requests in real-time with our interactive tool

    Bring Your Own Proxy

    Use your own proxies for up to 20% cost savings

    Migrate from Firecrawl

    Switch from Firecrawl with our compatibility layer

    Compare with Alternatives

    See how AlterLab compares to ScraperAPI, Firecrawl, and others

    See Also

    Blog & Tutorials

    Web scraping guides, anti-bot bypass techniques, and code examples

    Pricing

    5-tier pricing from $0.0002/request. Pay-as-you-go, credits never expire

    Compare Scraping APIs

    AlterLab vs ScraperAPI, Firecrawl, ScrapingBee, and Bright Data

    Anti-Bot Bypass

    Bypass Cloudflare, DataDome, PerimeterX, and Akamai automatically

    Quickstart
    Last updated: March 2026