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Verify Every User, Every Time

Multi-channel OTP delivery with smart fallback chains, fraud detection, and silent verification. Ensure 99.9% authentication success rates while keeping friction to an absolute minimum.

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Industry Challenges

Common communication pain points we solve for customer authentication businesses

OTP Delivery Failures

Single-channel OTP delivery has 5-15% failure rates. When verification fails, users abandon — costing you revenue and trust.

SIM Swap Fraud

Fraudsters hijack phone numbers through SIM swaps, intercepting SMS OTPs. Traditional SMS-only verification is increasingly vulnerable.

User Friction

Slow OTP delivery and multi-step verification flows increase abandonment rates. Users expect instant, seamless authentication.

How Zajel Solves This

Purpose-built communication solutions for your industry

Multi-Channel OTP Delivery

Send OTPs across SMS, WhatsApp, Voice, and Email — with automatic fallback. If the primary channel fails, the system instantly retries on the next channel in the chain within seconds.

  • 4-channel delivery (SMS → WhatsApp → Voice → Email)
  • Automatic failover in under 3 seconds
  • Custom fallback chain configuration
  • Per-country channel optimization

Multi-Channel OTP Delivery

Silent Network Verification

Verify users without any OTP code at all. Silent verification checks the user's mobile network identity in the background — zero friction, zero user input required.

  • Zero-touch verification
  • Network-level identity check
  • No SMS interception risk
  • Sub-second verification time

Silent Network Verification

Fraud Detection & Prevention

Real-time fraud scoring analyzes device fingerprint, IP geolocation, request velocity, and SIM registration data to block suspicious verification attempts before they complete.

  • SIM swap detection
  • Velocity-based rate limiting
  • Device fingerprinting
  • Real-time fraud scoring engine

Fraud Detection & Prevention

Recommended Products

The Zajel products that power customer authentication communication

Authentication FAQ

Secure Your User Authentication

Implement multi-channel verification in minutes with 99.9% success rates.

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