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Guides, comparisons, and tutorials for developers building with APIs.

9 min readComparisonEmail Validation

Free Email Validation API for Developers

Validate emails, detect disposable addresses, and reduce bounce rates with a free API. Compare ZeroBounce, Hunter.io, and Rebirth API with code examples.

9 min readComparisonIP Geolocation

Best Free IP Geolocation API in 2026

Compare IP geolocation APIs with VPN/proxy detection. ipinfo.io vs ipapi.com vs Rebirth API — pricing, features, and code examples.

10 min readTutorialText Extraction

How to Extract Text from Any URL with an API

Extract clean text from any URL for RAG pipelines, AI agents, and content analysis. Compare Readability, Diffbot, and Rebirth API.

10 min readTutorialDNS & WHOIS

DNS and WHOIS Lookup API for Security Tools

Build security audits, domain monitoring, and sales intelligence tools with DNS and WHOIS data. Code examples for Python and Node.js.

8 min readComparisonBusiness Lookup

Best Business Lookup API in 2026: Google Places vs Yelp vs Rebirth API

Compare pricing, data quality, and developer experience across the top business lookup APIs. Includes code examples and a cost breakdown.

10 min readTutorialWebsite Audit

Website Audit API for Developers: Automate SEO and Performance Checks

Learn how to automate website audits with an API. Build lead scoring, client dashboards, and bulk auditing tools.

9 min readTutorialLead Enrichment

How to Build a Lead Enrichment Tool with a Single API

Turn an email into a full profile. Build a complete lead scoring pipeline by combining business lookup, website audits, and enrichment.