Try an OTP Before You Integrate
Use free credits to send a real OTP to an Indian number. See the route, then verify the code.
Sign Up to Test →Countries / India
India OTP Delivery & Verification API
Verify users in India through SMS, WhatsApp, Viber and RCS. One API handles code generation, cost-based routing and automatic fallback.
Trusted by global companies
- Country code
- +91
- OTP channel options
- 4
- Fallback after
- 8s
- Indicative USD / OTP
- —
Channels
Connect your OTP channels through one API
Connect your channels once. Send and verify codes to +91 numbers through the same integration.
Destination · INDIA +91Verification · MANAGEDRoute selection · LOWEST COST
SMS OTP
Send codes to Indian mobile numbers using your registered sender and OTP template.
Explore →WhatsApp OTP
Send codes through your WhatsApp Business Account and approved authentication template.
Explore →Viber OTP
Send verification codes to Viber users through an approved business sender.
Explore →RCS OTP
Deliver branded verification messages to RCS-enabled devices on supported networks.
Explore →Availability depends on sender approvals and the recipient’s device and network.
Lower Costs. Automatic Fallback.
SecondFactor selects the lowest-cost eligible channel for each OTP and handles retries across your connected channels.
Check Availability
Find which connected channels can reach your user.
Route by Cost
Send through the lowest-cost eligible channel for India.
Retry Automatically
Try the next eligible channel after eight seconds without delivery confirmation.
Track Every Attempt
See the channel, delivery status and cost of each attempt in your OTP logs.
PIE Playground
Example delivery · +91 98XXX XXX21
- Attempt 1WhatsApp — no confirmation
- +8.0sAutomatic fallback
- Attempt 2SMS — delivered in 2.1s
- Verify200 OK · code matched
Connect. Send. Verify.
SecondFactor handles code generation, delivery and validation. Your app makes two API calls.
01
Connect Your Channels
Set up your senders and approved templates for SMS, WhatsApp, Viber or RCS.
02
Test Your Setup
Send a test OTP in the PIE Playground to check delivery and verification.
03
Send a Code
Call /otp/send with the user’s number in +91 format. SecondFactor generates and delivers the OTP.
04
Verify Your User
Call /otp/verify with the request ID and entered code to get the verification result.
Verification for Signup and Login
Phone Verification
Confirm users control their phone number before creating an account.
View API Docs →Two-Factor Authentication
Add an OTP alongside a password to protect logins and sensitive account changes.
Talk to Our Team →OTP Pricing for India
Price per delivered OTP — India
—
USD · indicative
One rate per delivered OTP, including delivery and verification.
Indicative pricing. Contact us for a quote based on your volume and channel setup.
Which OTP Channels Can I Use in India?+
SMS, WhatsApp, Viber and RCS through one API. Enable the channels you need; routing depends on sender approvals and recipient availability.
Do I Need DLT Registration?+
For domestic SMS, register your business, sender header and OTP template on an operator’s DLT platform. See TRAI’s sender requirements. WhatsApp uses a separate authentication template approval process.
What Happens if Delivery Fails?+
After eight seconds without confirmation, SecondFactor tries the next eligible channel enabled on your account. Review each attempt’s status and cost in your OTP logs.
Can Businesses Outside India Use SecondFactor?+
Yes. Contact our team to confirm the right channel setup and pricing for your business.
How Do I Format Indian Phone Numbers?+
Use E.164 format: +91 followed by the 10-digit mobile number, without spaces or a leading zero. Example: +919876543210.
What Does an OTP to India Cost?+
The indicative rate shown above covers delivery and verification per delivered OTP. Contact sales for pricing based on your volume and channels.
Can I Test Before Integrating?+
Yes. Create an account and use your free credits in the PIE Playground to send a real OTP, inspect its route and verify the code.
Start Verifying Users in India
Send your first OTP with free credits. Need help with your India setup? Talk to our team.