Secure authentication via automated voice calls. 30% cheaper than SMS.
Why businesses are losing money and customers with traditional SMS authentication
SMS frequently delayed or never delivered, especially in poor network areas. Users abandon authentication flows.
Exposed to SIM swap attacks, SMS interception, and SS7 exploits that compromise user accounts.
You pay for failed messages, retries, and undelivered SMS. Costs add up quickly without guarantees.
Users must wait, read carefully, and type correctly. Often frustrating for elderly or visually impaired users.
See how VoicePass outperforms traditional SMS authentication in every metric
| Feature | SMS OTP | VoicePass |
|---|---|---|
| Cost per Authentication | ₦5.0 - ₦8.0 | ₦3.8 |
| Delivery Success Rate | 70-85% | 95%+ |
| Payment Model | Pay even if failed | Pay only for connected calls |
| SIM Swap Protection | Vulnerable | Protected |
| SMS Interception Risk | High Risk | No Text to Intercept |
| SS7 Exploit Immunity | Vulnerable | Voice routing bypasses SMS |
| Works in Poor Coverage | Often Fails | Reliable |
| Accessible for Elderly | Difficult | Easy - Just listen |
| Visually Impaired Support | Poor | Excellent |
Four compelling reasons to switch your authentication system
₦3.8 vs ₦5-8 for SMS. Pay only for connected calls with no wasted spend on failures.
Immune to SIM swap, SMS interception, and SS7 exploits. User must answer in real-time.
Calls connect when SMS fails. Works in rural areas with instant delivery and no delays.
No reading or typing stress. Accessible for elderly and visually impaired users.
Simple integration in minutes with our REST API
Make a POST request to our API with the phone number and OTP code. System immediately triggers the voice call and returns a call ID for tracking.
System dials the phone number, OTP is read clearly with digit-by-digit repetition, and call ends automatically after delivery.
Every call is logged with phone number, call ID, status (answered/failed/busy), duration, and timestamp for full visibility.
Optional real-time webhooks notify your system when call is initiated, answered, failed, or completed for automated workflows.
curl -X POST https://api.voicepass.skurel.com/send-voice-otp \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"phone": "+234801*****",
"otp": "6294"
}'{
"call_id": "call-9f23ab21ess",
"status": "queue",
"message":"Voice OTP call initiated"
}{
"call_id": "call-9f23ab21ess",
"duration": 12,
"cost": 3.8,
"status": "ANSWERED", // ANSWERED, BUSY, FAILED, NOANSWER, UNAVAILABLE
"created_at": "2026-02-06T14:30:12Z",
"start_time": "2026-02-06T14:30:12Z",
"answer_time": "2026-02-06T14:30:12Z",
"ring_time": "2026-02-06T14:30:12Z",
"end_at": "2026-02-06T14:30:12Z",
"phone_number": "+234801*****",
"otp": "6294",
"gender": "female",
"language": "en"
}Perfect for industries where security and reliability matter most
Secure account authentication, transaction authorization, and payment confirmation with fraud-resistant voice delivery.
Login verification, password reset, and order confirmation with high delivery success rates across all networks.
Patient appointment verification, prescription authorization, and secure access to medical records with HIPAA compliance.
Citizen identity verification, benefits authorization, and secure access to government portals with accessibility features.
SIM activation, account recovery, and service changes with protection against SIM swap fraud attacks.
Employee authentication, VPN access, and sensitive system logins with enterprise-grade security and compliance.
Join leading banks, fintechs, and enterprises using VoicePass