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OTP Authenticator

Secure authentication with instant OTP delivery.

Deliver one-time passwords via SMS, WhatsApp and Voice in under 5 seconds. Enterprise-grade security with 99.9% delivery rates and built-in fraud protection.

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99.9% Delivery Rate
<5s Avg Speed
100M+ OTPs Daily
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Key Capabilities

Enterprise OTP Delivery Features

Multi-Channel OTP

Deliver OTPs via SMS, WhatsApp or Voice call with automatic fallback. If SMS fails, WhatsApp takes over and ” ensuring 99.9% delivery every time.

Fraud Protection

Built-in anti-fraud features including rate limiting, IP blocking, SIM swap detection and suspicious pattern alerts. Protect users from OTP interception attacks.

Smart Retry Logic

Automatic retry with intelligent fallback to alternative channels. Configurable retry intervals, expiry times and attempt limits to maximise delivery success.

Industry Use Cases

OTP Authentication for Every Industry

See how businesses use OTP Authenticator to secure logins, transactions and user verification.

Banking OTP

Secure Every Banking Transaction with OTP Verification

Protect high-value transactions with instant OTP verification. Our banking-grade delivery ensures OTPs reach customers in under 3 seconds and ” critical for real-time fraud prevention.

  • Transaction authorisation OTP delivery under 3 seconds.
  • Net banking and mobile app login 2FA via OTP.
  • SIM swap detection and suspicious login alerts.

Multi-Channel Fallback Ensures Zero OTP Drop

If SMS delivery fails due to network issues, the system automatically falls back to WhatsApp or Voice OTP. Bank customers always receive their verification code regardless of channel availability.

  • Automatic SMS → WhatsApp → Voice OTP fallback chain.
  • Configurable fallback timing and retry logic per channel.
  • 99.9% OTP delivery SLA with real-time monitoring.
Banking OTP Fallback
OTP Analytics

Compliance-Ready OTP with Full Audit Trail

Every OTP event is logged with timestamp, channel, delivery status and expiry. Generate audit reports for RBI, TRAI and regulatory compliance with complete OTP transaction history.

  • Complete OTP delivery log with timestamps for audit.
  • Fraud attempt detection and alert reports.
  • RBI and TRAI-compliant DLT template registration.
<3s average OTP delivery for banking transactions
E-Commerce OTP

Verify Customer Identity at Every Critical Checkout Step

Secure account creation, login, checkout and payment with OTP verification. Reduce fraud chargebacks and protect customers from account takeover attacks.

  • New account registration verification via SMS or WhatsApp OTP.
  • High-value order authorisation with payment OTP confirmation.
  • Address change and account update security verification.

Deliver OTPs via WhatsApp for Higher Engagement

WhatsApp OTPs achieve higher open rates than SMS. Customers see the OTP instantly in their WhatsApp chat, reducing failed logins and improving conversion rates at checkout.

  • WhatsApp OTP delivery with branded business profile.
  • Instant notification even when SMS is delayed.
  • 2x higher open rate for WhatsApp vs. SMS OTP.
WhatsApp OTP
OTP E-Commerce Analytics

Track OTP Performance and Fraud Metrics

Monitor delivery rates, conversion rates, failed attempts and fraud signals across all OTP use cases. Use analytics to optimise delivery channels and reduce friction for legitimate customers.

  • Delivery rate, conversion rate and failed attempt tracking.
  • Suspicious pattern detection and fraud alert reporting.
  • Channel-wise performance comparison (SMS vs WhatsApp).
99.9% OTP delivery rate across all channels
Healthcare OTP

Secure Patient Portal Access with OTP Authentication

Protect sensitive patient data and health records with OTP-based 2FA. Ensure only authorised users can access medical records, test results and prescription histories.

  • Patient portal login verification via SMS or WhatsApp OTP.
  • Prescription refill and teleconsultation access authorisation.
  • Electronic health record access audit logging.

Verify Patient Identity Before Sensitive Procedures

Use OTP verification to confirm patient identity before high-risk procedures, prescription collection or insurance claim submissions and ” reducing medical identity fraud.

  • Patient identity verification for prescription dispensing.
  • Insurance claim submission authorisation via OTP.
  • Consent management with OTP-based digital signatures.
Healthcare Identity Verification
Healthcare OTP Analytics

HIPAA-Compliant OTP Delivery with Audit Trails

All OTP events are logged with complete audit trails for HIPAA compliance. Monitor access attempts, failed verifications and suspicious activity with real-time security dashboards.

  • Complete OTP audit log for HIPAA compliance reporting.
  • Failed attempt monitoring and suspicious access alerts.
  • GDPR and HIPAA-compliant data storage and processing.
100% audit trail coverage for all OTP authentication events
Pricing Models

Choose a Plan Built for Your Scale

Growth Plan

Custom Pricing

Perfect for growing businesses needing reliable OTP delivery.

  • SMS & WhatsApp OTP
  • Basic Fraud Detection
  • Standard Delivery Reports
  • No Dedicated Account Manager
BEST VALUE
Enterprise Pro

Volume Custom

Built for high-volume OTP delivery with advanced security.

  • Multi-Channel OTP + Voice
  • Advanced Fraud Protection
  • Custom Retry Logic
  • 24/7 SLA Support
Seamless Process

Start Delivering OTPs in 3 Simple Steps

1. Integrate the API

Integrate our OTP API with a simple REST call. Full SDK support for PHP, Node.js, Python, Java and more. Ready in under 30 minutes.

2. Configure Your Settings

Set OTP length, expiry time, channel priority and retry logic. Configure DLT sender IDs and message templates for instant deployment.

3. Go Live and Protect Users

Start delivering secure OTPs instantly. Monitor delivery rates and fraud signals from your real-time analytics dashboard.

EASY INTEGRATIONS

Connect OTP to Your Existing Systems

Nimbus OTP Authenticator integrates with your authentication systems, CRM and e-commerce platforms via REST APIs and ” no complex setup required.

REST APIs JSON Webhooks
Shopify
WooCommerce
Salesforce
HubSpot
Zoho CRM
Zapier
Google Sheets
Slack
Mailchimp
Pipedrive
Magento
Custom Auth

Ready to Secure Every User Authentication?

Schedule a free demo and discover how enterprise OTP delivery can protect your users and reduce fraud losses.

  • Free API integration assistance
  • DLT template registration support
  • Dedicated account manager from day one

Request a Free Demo

Our team will reach out within 24 hours.

Got Questions?

Frequently Asked Questions

Everything you need to know about OTP Authentication.

Nimbus OTP Authenticator supports SMS, WhatsApp and Voice call delivery channels. You can configure primary and fallback channels and ” for example, SMS first, then WhatsApp, then Voice and ” to ensure maximum delivery success even during network issues.

OTPs are typically delivered in under 5 seconds on domestic routes and under 10 seconds internationally. Our direct telecom connectivity and intelligent routing ensure the fastest possible delivery path for every OTP request.

Nimbus OTP Authenticator includes built-in fraud protection features including rate limiting per number, IP-based blocking, SIM swap detection alerts and suspicious pattern monitoring. You can configure security thresholds to match your risk tolerance.

Yes, DLT registration is mandatory in India for sending transactional SMS including OTPs. Nimbus Adcom assists with the complete DLT registration process and ” including business registration, sender ID registration and OTP template approval on the TRAI DLT portal.