Send OTPs on WhatsApp in seconds, with SMS backup when needed. Simple APIs, transparent pricing, and a developer portal that gets you live fast.
POST /api/v1/auth/initiate { "success": true, "channel": "whatsapp", "session_id": "019e92..." }
Wallet balance
₹2,450.00
98.4% delivery
Last 30 days
2M+
OTPs delivered
500+
Active applications
98.4%
Delivery success rate
150ms
Avg. API response
Trusted by product teams across industries
Platform capabilities
Self-serve developer portal, multi-app API keys, real-time wallet billing, and production-grade OTP orchestration — backed by Powered by Ominiflow infrastructure.
Highest conversion channel in India, LATAM & MENA. Template-based delivery with automatic optimization.
Global SMS routing when WhatsApp is unavailable. One API — we handle failover automatically.
Secure tokens issued on verify. Server-side validation endpoint included for your backend.
Pay only for messages sent. Transparent per-channel pricing, Razorpay & Stripe top-ups.
Session logs, channel attempts, success rates — per application with export-ready data.
Phone normalization and country-aware routing for worldwide users out of the box.
How it works
Set up in minutes and open your developer console right away.
Add your application, grab your API key, and paste our ready-made snippet.
One API call — we deliver via WhatsApp first, SMS if needed.
Confirm the code and get a secure token for your backend.
Smart orchestration
Your app calls a single endpoint. OTPNexa (Powered by Ominiflow) selects WhatsApp or SMS, manages retries, and returns a verified token — no channel logic in your codebase.
Primary channel — 40% lower cost, 2× higher open rates vs SMS in India.
Twilio-powered global SMS when WhatsApp fails or times out automatically.
Backend token verify before creating user sessions — secure by default.
Create application
Get App ID + API key from portal
POST /auth/initiate
Send user phone number → OTP delivered
POST /auth/verify
Validate OTP → receive signed JWT
Simple setup · Pay only for messages you send
From MVP to millions of users — same API, same reliability.
Checkout login, order tracking, seller onboarding
KYC-lite signup, transaction confirmations
Rider/driver verification, delivery OTP
Patient portal access, appointment booking
Student login, trial signup, team invites
Passwordless signup with highest conversion
Transparent pricing
Top up your wallet. We deduct only when a message is successfully sent. Volume discounts available.
WhatsApp OTP
₹0.25
per successful message
SMS OTP (fallback)
₹0.50
per successful message
Wallet top-up packages
₹500
Wallet credit ₹500
₹2,000
10% extra
Wallet credit ₹2,200
₹10,000
15% extra
Wallet credit ₹11,500
Security & compliance
Architecture designed for regulated industries and high-trust consumer apps.
OTP hashing
Codes never stored in plain text — bcrypt hashed at rest
API key auth
SHA-256 hashed keys, prefix-only display in portal
Audit logs
Full session & wallet transaction history with export
Legal ready
Privacy, Terms & Refund policies included
Most teams go live in under 30 minutes. Create an account, get your API key, and use our playground to send a test OTP instantly. Full REST API docs are in the developer portal.
No — you can start right away with our platform WhatsApp number. When you're ready, connect your own WhatsApp Business number so OTPs go out with your brand name.
Our orchestration layer automatically retries via SMS fallback within seconds. Your users get their OTP either way — no extra code on your side.
You only pay for OTPs that are actually sent. Top up your wallet anytime, track usage in your dashboard, and scale at your own pace. Try demo mode first to test your integration without sending live messages.
We support 50+ countries with E.164 phone normalization. WhatsApp works best in India, Southeast Asia, LATAM, and MENA. SMS fallback covers virtually all regions.
Join teams shipping faster with OTPNexa. Set up in minutes, connect your app, and start delivering OTPs your users actually receive.
No long contracts · Transparent pricing · Support when you need it