Protect your users and your platform with fast, reliable OTP delivery via SMS, WhatsApp, and Voice. Reduce fraud, lower account takeover rates, and give users a seamless verification experience.
<100ms
OTP Delivery
99.99%
Delivery Uptime
99%+
Verification Success
3
Delivery Channels
In a world where account security is table stakes, unreliable OTP delivery creates a double threat: frustrated users who abandon your platform, and open doors for bad actors. A single failed channel with no fallback can bring your entire authentication flow to a halt.
Sendexa delivers a resilient, multi-channel OTP engine that refuses to fail. With automatic channel fallback, built-in fraud detection, and enterprise-grade uptime, your users are always verified — and your platform is always protected.
From instant SMS OTP to intelligent fraud scoring, Sendexa gives you a complete authentication stack that scales with your user base.
Deliver 4–8 digit one-time passwords via SMS in under 100ms with global coverage and intelligent local routing for maximum deliverability.
Send OTPs via WhatsApp for higher open rates and a more engaging user verification experience — perfect for mobile-first audiences.
Fallback voice calls read the OTP aloud for users who cannot receive SMS, ensuring zero lost verifications across every scenario.
Built-in rate limiting, velocity checks, and phone number intelligence to block OTP abuse, SIM swap fraud, and enumeration attacks.
Verify users seamlessly in the background without requiring them to enter a code — for frictionless onboarding and reduced drop-off rates.
Real-time delivery receipts, conversion funnels, and failure analysis to continuously optimize your authentication flow and boost success rates.
See how Sendexa's authentication flow handles every scenario — from first-time signup to high-risk login — without dropping a single user.
User enters their phone number or email. Sendexa immediately dispatches an OTP via the preferred channel with sub-100ms latency.
OTP arrives in under 100ms. If SMS fails, Sendexa automatically retries via WhatsApp then Voice — zero manual intervention required.
User enters the OTP. Sendexa validates it server-side with a single API call and returns a clear success or failure response in milliseconds.
Verified user gains access. Full delivery and verification logs are stored for security auditing, compliance reporting, and anomaly detection.
Sendexa's authentication solution is built on a trio of battle-tested communication APIs — each optimised for speed, reliability, and scale.
Thousands of African apps and platforms trust Sendexa to verify their users securely. Integrate in minutes with our simple REST API and start blocking fraud from day one.