Adding OTP is easy. Operating it securely at scale isn't. Build it yourself, and you inherit generation, verification, abuse, rate limits, deliverability, and monitoring. Buy a broader auth or verification platform, and you may inherit pricing, limits, and infrastructure you don't need. Authepy turns the entire Email OTP layer into infrastructure with zero-trust security, abuse controls, deliverability safeguards, BYOD, and observability. Keep your users, database, and UI. Start free.