Verify API
WhatsApp OTP Service
Authenticate users on the spot by sending OTPs via WhatsApp. With WhatsApp, you can boost verification success rates through a channel your audience already trusts.
Higher open ratesReduced spendTrusted by Leading Brands Worldwide
What Is WhatsApp OTP?
WhatsApp OTP (one-time password) is a secure way to verify users by sending a temporary code directly through WhatsApp instead of SMS. Businesses use WhatsApp OTP for actions like account logins, sign-ups, password resets, and other sensitive steps where identity verification matters. Unlike traditional SMS, WhatsApp OTP messages are end-to-end encrypted, sent from an official WhatsApp Business profile, and display the brand’s name. This makes them easier to recognize, more trustworthy, and more likely to be delivered and opened.
How WhatsApp OTP Works
A user initiates an action (such as logging in or resetting a password).
The system requests a one-time password (OTP) via Dexatel’s WhatsApp OTP API.
Dexatel sends the OTP using an authorized WhatsApp authentication template.
The user receives the code directly via WhatsApp and enters it.
Dexatel verifies the OTP and validates authentication.
The WhatsApp OTP message expires automatically within a set time limit.
WhatsApp OTP Vs SMS OTP Comparison Table
| Feature | WhatsApp OTP | SMS OTP |
|---|---|---|
Delivery Rate | Very high | Medium |
Encryption | End-to-end | No |
Branding | Business profile shown | No |
Spam Filtering | Minimal | High |
Cost Efficiency | Better at scale | Rising costs |
Rich Content | Supported | Not supported |
User Trust | High | Lower |
Businesses switching from SMS OTP to WhatsApp OTP often see improved verification success rates and lower authentication friction.
- Generate one-time passwords
- Send OTPs via WhatsApp authentication templates
- Set expiration times for OTPs
- Get status of delivery and verification
- Carry out secure OTP validation
The API integrates easily and supports all the popular languages and frameworks.
Why Choose WhatsApp for OTP Delivery
Trusted User Experience
Benefit from a familiar, reliable, and secure messaging platform used every day by more than 2 billion people.
Branded and Verified Messaging
Send OTPs from your official WhatsApp Business profile, boosting trust and reducing phishing risks.
Cost-Effective
Reduce OTP delivery costs in regions where SMS is expensive. Plus, you only pay for delivered messages.
Key Features
Intelligent Fallback
If WhatsApp fails, Dexatel’s system automatically switches to SMS, Flash Call, or Voice, guaranteeing OTP delivery.
Easy API Integration
Our developer-friendly API and SDKs make integration simple, with detailed documentation and 24/7 support included.
Secure Authentication
OTP WhatsApp messages are time-bound, tamper-resistant, and fully encrypted for safe login and transaction validation.
Delivery and Engagement Insights
You can track sent, delivered, and read statuses in real-time and optimize performance using full analytics.
Multi-Channel Flexibility
Our platform supports multiple communication channels, including SMS, Viber, and Telegram—all within one API.
Global Reach
We help you authenticate users across more than 190 countries, with region-optimized delivery and built-in compliance.
Getting Started With WhatsApp OTP
Sign Up
Create your free Dexatel account—no credit card needed.
Connect WhatsApp
Link your WhatsApp Business Account in the Dexatel dashboard.
Verify With Meta
Our team will guide you through the Meta verification process.
Create a Template
Submit a pre-approved WhatsApp authentication message template.
Integrate the API
Use our API or SDKs to send OTPs with fallback logic and delivery insights.
Use Cases For OTPs via WhatsApp
Account Registration
Authenticate users at the point of sign-up using a one-time password sent through WhatsApp. This goes a long way in blocking the formation of fake accounts and bots.
Password Reset
Verify the credentials of the user before allowing a password reset by providing a secured OTP via the use of the Whatsapp service. The use of the Whatsapp service limits the vulnerability of account takeover.
Transaction Verification
To further enhance security and prevent financial fraud, safeguard payments, withdrawals, and other high-value transactions on WhatsApp by using a WhatsApp OTP to verify every transaction.
Two-Factor Authentication (2FA)
Improve account security using an additional login layer for users—a combination of passwords and WhatsApp OTP. This is much safer and still allows for quick login access.
Profile Updates
Validate sensitive changes, like email IDs, phone numbers, or account settings, by sending an OTP on WhatsApp to make sure that only the account owner makes changes to their profile.
WhatsApp OTP Pricing
| Channel | Starting From* |
|---|---|
WhatsApp OTP | $0.007 per message |
Volume Discounts | Available for high-throughput use cases |
Flexible Billing | Pay-as-you-go or custom enterprise plans |
WhatsApp Authentication Templates Explained
OTPs are sent in templates, guaranteeing:
Consistent message structure
Compliance with WhatsApp policies
Speed of delivery and trust gains
Dexatel helps businesses with:
Template creation
WhatsApp approval process
Localization for various regions
Compliance and best practices
Industries We Support
Finance and Fintech
Verify logins and transactions securely
eCommerce
Prevent fake orders and improve checkout flow
Healthcare
Protect sensitive patient login and record access
SaaS and Apps
Streamline onboarding and minimize churn
Education
Safeguard access to portals, exams, and admin panels
Got Questions? We’ve Got Answers
Is WhatsApp OTP secure?
Yes. WhatsApp OTP messages are end-to-end encrypted and sent using official WhatsApp authentication templates from a verified WhatsApp Business profile. Each OTP is time-bound and can only be used once, making it highly secure for user verification.
Do users need to have WhatsApp installed?
Yes. WhatsApp OTP works only for users who have an active WhatsApp account linked to their phone number. If WhatsApp delivery fails, Dexatel’s intelligent fallback automatically switches to SMS, Flash Call, or Voice to ensure authentication isn’t interrupted.
What happens if the OTP is not delivered?
Dexatel uses intelligent fallback logic. If WhatsApp delivery fails due to connectivity or user limitations, the OTP is instantly rerouted through another channel, such as SMS, Flash Call, or Voice, without any additional setup required.
How long does a WhatsApp OTP remain valid?
OTP expiration times are fully configurable. You can set how long each code remains valid based on your security and user experience requirements. Once expired, the OTP cannot be reused.
Is WhatsApp OTP available globally?
Yes. You can authenticate users in over 190 countries. Dexatel optimizes delivery based on regional availability and compliance, ensuring consistent performance worldwide.
Start Verifying With WhatsApp OTP
Join global businesses using Dexatel to deliver fast and secure authentication via OTP WhatsApp messages.
