Modern Bot Detection Techniques
Discover how advanced bot detection systems work, from behavioral analysis to machine learning algorithms. Learn what makes rCAPTCHA different from traditional solutions.
Read MoreStart at $9/month with included verification volume and upgrade as your traffic grows.
Drop in a standalone rCAPTCHA challenge for forms and gates, or use the combined rCAPTCHA + MagicAuth widget when the next step is account login.
Served from Cloudflare Pages as a static frontend, with verification handled securely.
Standalone verification for forms, or a combined CAPTCHA and MagicAuth login flow for account access.
Best for forms, downloads, comments, and other actions that only need bot verification.
Best when a verified human should immediately receive a passwordless login link.
<!-- Generate this from your rCAPTCHA dashboard for each approved site -->
<iframe
src="https://rcaptcha.app/widget.html?site_key=YOUR_SITE_KEY&service=rcaptcha"
style="width: 320px; height: 190px; border: 0; overflow: hidden;"
scrolling="no"
loading="lazy"
title="rCAPTCHA verification">
</iframe><!-- Use when the protected action is account login -->
<iframe
src="https://rcaptcha.app/widget-combined.html?site_key=YOUR_SITE_KEY&service=rcaptcha_login&redirect_url=/dashboard.html"
style="width: 360px; height: 330px; border: 0; overflow: hidden;"
scrolling="no"
loading="lazy"
title="rCAPTCHA and MagicAuth login">
</iframe>POST https://api.rcaptcha.app/rcaptcha/verify
Verify a widget completion from your backend with the site key generated in your dashboard. Keep this server-side so your site can trust the result before creating a session or accepting a sensitive action.
curl -X POST https://api.rcaptcha.app/rcaptcha/verify \
-H "Content-Type: application/json" \
-d '{"site_key":"YOUR_SITE_KEY","solution":"verified","ad_loaded":true,"solve_time_ms":1800,"timestamp":1760000000000}'Create sites immediately, then rCAPTCHA enforces registered domains at runtime.
$9/mo
$29/mo
$79/mo
Learn about bot detection, CAPTCHA technology, and online security
Discover how advanced bot detection systems work, from behavioral analysis to machine learning algorithms. Learn what makes rCAPTCHA different from traditional solutions.
Read MoreTraditional CAPTCHAs frustrate users with distorted text and endless image puzzles. Learn how modern solutions like rCAPTCHA improve both security and UX.
Read MoreUnlike traditional CAPTCHAs that rely on image recognition, behavioral analysis examines how users interact with verification challenges to distinguish humans from bots.
Read MoreTry the demo above and get your free API key instantly via email!
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