User Identity Authentication

Secure your users with multichannel OTP authentication during signup and login process. Use Message Central's user authentication suite which includes:-

  • OTP authentication via SMS and WhatsApp.
  • Silent network authentication.
  • P2A authentication.
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No credit card  |  Quick setup  |  Pay as you go
illustration of SMS and WhatsApp OTP used for secure user authentication and login verification
Trusted by fast growing startups

User Authentication with Message Central

price

Secure & Reliable

delivery

Multichannel OTP Delivery

growth

At least 30% Cost Savings

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How to Implement Secure OTP User Authentication?

bag
STEP 1

Sign up and try the OTP verification

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api
STEP 2

Integrate OTP API and Test

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wallet
STEP 3

Add credits to your wallet and start verify!

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Integrate OTP Authentication APIs

Our OTP authentication APIs integrate smoothly with any signup or login process through our REST API. You can use SMS/ WhatsApp as channels.
  • List Icon

    Create an account for free.

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    Test our APIs by sending OTP verification code to any number of your choice.

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    Check the authentication status basis your OTP verification code input.

API DocumentationRequest Demo
OTP Authentication Code

{
   "responseCode":200,
   "message": "SUCCESS",
   "data":{
       "verificationId": "20",
       "mobileNumber": "8846735392",
       "responseCode": "200",
       "errorMessage": null,
       "timeout": "60",
       "smsCLI": null,
       "transactionId": null
   }
}

How Does User Identity Authentication Works?

mobile
STEP 1

A user provides mobile number to signup on your app

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otp-delivery
STEP 2

Message Central’s APIs attempt multichannel OTP delivery

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input
STEP 3

User receives and input the OTP for secure verification

Message Central vs Twilio for User Authentication

Compare, Test and Verify!
Factor
Twilio Red Logo
24/7 Customer Support
Paid
Check Circle Icon Filled - Green Tick
Yes, without additional cost
Global OTPs
Check Circle Icon Filled - Red Cross
No
Check Circle Icon Filled - Green Tick
Yes
User Authentication
Check Circle Icon Filled - Green Tick
Yes
Check Circle Icon Filled - Green Tick
Yes
Verification fee
$ 0.05
$ 0.03
40% lesser
Analytics
Check Circle Icon Filled - Green Tick
Yes
Check Circle Icon Filled - Green Tick
Yes
Account Management
Paid
Check Circle Icon Filled - Green Tick
Yes, without additional cost
APIs
A lot of APIs
Developer friendly APIs with technical support
OTT Channels
WhatsApp, RCS
WhatsApp, RCS, P2A
Pricing
$ 0.0079 for USA
$ 0.0078 for USA
You can also refer to our SMS pricing calculator and get in touch for a custom quote.

Do Not Want to Code?

Work with our trusted partners for coding and implementation support.

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Frequently Asked Questions

Which is the best form of user authentication for businesses?

The best form of user authentication for businesses is multi-factor authentication (MFA), combining something the user knows, has, or is. For speed and reach, OTP SMS-based verification remains one of the most widely used methods. VerifyNow helps businesses launch OTP SMS verification in under 5 minutes using transactional SMS setup.

What is the best OTP SMS Verification API for user authentication?

The best OTP SMS Verification API for user authentication offers fast delivery, global reach, easy integration, and minimal setup requirements. VerifyNow lets businesses go live with OTP SMS verification in minutes using developer-friendly APIs and SDKs, even without a registered sender ID, and supports verification across 190+ countries.

Can one OTP SMS Verification API handle global authentication?

Yes, a single OTP SMS Verification API can handle global user authentication if it supports international delivery and local regulations. VerifyNow supports OTP SMS verification in 190+ countries, automatically managing routing and regional compliance, making it ideal for businesses with global users.

Can I replace SMS OTP with another authentication method?

Yes, OTP SMS verification can be replaced or complemented with WhatsApp OTP authentication, email OTPs, or app-based authentication. Many businesses use multi-channel verification for higher reliability. VerifyNow supports both SMS and WhatsApp verification, allowing seamless fallback without changing your integration.

Is WhatsApp OTP verification more secure than SMS OTP verification?

WhatsApp OTP verification is often considered more resistant to SIM-swap attacks and message interception than SMS OTP verification. However, both methods are secure when implemented properly. VerifyNow allows businesses to use SMS OTP with in-built WhatsApp OTP fallback (or vice versa) of both for improved delivery and security.

How do I set up two-factor authentication (2FA) using OTP SMS verification?

To set up two-factor authentication (2FA) using OTP SMS verification, businesses send a one-time code to the user’s registered mobile number after the primary login step. With VerifyNow, you can enable SMS-based 2FA in under 5 minutes using developer-friendly APIs and SDKs (without needing a registered sender ID upfront, 10DLC, or DLT etc.) and test delivery globally using free signup credits.

Can I use OTP SMS verification to reset passwords and recover user accounts?

Yes, OTP SMS verification is commonly used for password resets and account recovery. A one-time code is sent to the user’s verified phone number to confirm identity before allowing a reset. VerifyNow makes this easy to implement with secure OTP SMS verification APIs that work reliably across 190+ countries, helping businesses reduce support tickets and account lockouts.

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