Arcjet

CAPTCHA was designed for a simpler web but modern attackers use human solver services, AI-assisted tools, and distributed proxy networks to bypass it cheaply. The real problem is architectural: CAPTCHA creates a single verification moment while attacks target systems before or after that point. Effective bot mitigation requires context-aware, layered controls including adaptive rate limiting with identity-aware quotas, behavioral analysis, and anomaly detection at the API layer. CAPTCHA can remain as a fallback for high-risk scenarios but should not be the primary defense, especially for login flows, signup endpoints, checkout APIs, and AI inference routes.

Is CAPTCHA Still Effective in 2026 and What to Use Instead

Usability and Conversion Impact of CAPTCHA

Adaptive Rate Limiting as a Primary Defense