One-Time Password Verification (OTP)

Experience Unmatched Security: Elevate Your Business Protection with Our 99.9% Successful SMS OTP Verification Service.

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Trusted One-Time Password Verification Services & API

Esendex’s SMS OPT Verification Service is Trusted by Some of The Biggest Brands in The World!

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Esendex helps businesses communicate quickly, simply, and cost-effectively with our OTP (one-time passcode) verification services through SMS to level up your business’s security.

What is OTP Verification via SMS?

OTP verification through SMS secures online accounts or transactions by requiring users to enter a unique code sent to their mobile phone via SMS. This authentication method is useful in many industries, from online banking to e-commerce, where secure authentication is essential.

When an OTP is sent through SMS and verified, it provides an additional layer of security by confirming that the person attempting to access the account or complete the transaction is the legitimate account holder.

OTP Verification via SMS: How Does It Work

OTP verification via SMS is a straightforward process. When users attempt to access an account or complete a transaction, they are prompted to enter their mobile phone number. Next, an OTP code is generated and sent to the mobile phone via SMS.

To complete the verification process, the user must enter that one-time passcode on the website or app. This is usually a time-sensitive task with a code that expires within 5 to 10 minutes of being sent to the user for security.

Advanced Features of OTP Verification via SMS with Esendex

At Esendex, we provide advanced features to enhance the security of your OTP verification service through SMS, including:

Customized Sender IDs

Our customized sender ID feature will allow you to personalize SMS messages with your company name. Instead of getting a generic message and code, your customers will be reminded of your branding each time they interact with your app or website. This will create a more professional and trustworthy image for your business when your customers receive your communication.

Delivery Receipts

With our delivery receipt feature, you will be notified each time your SMS message has successfully reached your customer’s inbox. This will clear up any speculation by clearly confirming your message’s destination.

Time-based One-Time Passwords (TOTP)

Time-based one-time passwords present an additional layer of security by expiring after a set period. When your customers attempt to sign in or complete the transaction, they will only have a short time to use the one-time password sent to their phone.

If they don’t make it in time, they must request a new OTP to complete their action. This will prevent cyber criminals from accessing the code later and authenticating themselves as customer fraudulently.

Benefits of SMS OTP Verification

SMS OTP Verification has several benefits that can help your business grow:


SMS OTP verification is a secure method of protecting data, accounts, and transactions. Since they can only be used once and are time-bound, it becomes more difficult for accounts to be hacked or fraudulent transactions to be completed. Your systems and customer accounts will remain secure, as expired codes prevent unauthorized access at a later time.


SMS OTP verification is the most reliable method of authentication. It’s one of the only ways to ensure the user can access a system or account, reducing the risk of fraud and unauthorized access to critical information. SMS verification via OTP has been a trusted strategy for securing digital transactions for years.

Easy Implementation

An SMS OTP verification system is easy to implement, even without technical skills or a specialized department. It typically only requires finding a suitable provider and following simple steps to integrate their API on the back end of your website or app. Once you have activated the service, your customers will be ready to receive authentication codes.


SMS OTP verification is a user-friendly method of securing digital transactions. Users only need their mobile phone and a valid SIM card to receive the OTP, making it a convenient way to keep their online accounts secure.

Reduces Password Fatigue

SMS OTP verification helps to reduce password fatigue by eliminating the need for users to remember complex passwords or security questions. Since OTPs are sent directly to the user’s phone, they won’t need to remember it for long. Instead of using weak passwords or reusing the same ones, they can simply copy and paste a code for each account.

Improves Customer Experience

SMS OTP verification makes it easier for customers to access their accounts and complete secure transactions, improving the overall customer experience. Your customers are much more likely to be satisfied with this system in place and trust your brand for account security.

Compliance with Regulations

SMS OTP verification complies with regulations such as GDPR and PSD2, which require strong customer authentication to secure digital transactions. SMS OTP verification ensures businesses comply with these regulations and avoid fines or legal action for non-compliance.

Why Choose Esendex for OTP Verification via SMS?

At Esendex, we understand that businesses need to trust their verification systems. Our OTP verification service through SMS offers several benefits, including:

  • Enhanced Security: Our OTP verification service through SMS adds an extra layer of security to your online accounts and transactions, minimizing the risk of fraud and unauthorized access.
  • Cost-effective: OTP verification via SMS is an affordable solution to save money on traditional security methods, such as hardware tokens.
  • Fast and Reliable: RSM is an optimized service to deliver OTP codes quickly and reliably. This reduces the time your customers wait and minimizes the risk of sign-in errors.
  • Simple and Easy to Use: Our OTP verification service through SMS is easy to set up and straightforward to use, ensuring a smooth and hassle-free experience for you and your customers.

Ready to Implement SMS OTP Verification?

To implement SMS OTP verification, follow these steps:

Step 1: Integrate the SMS OTP Verification Service

After choosing an SMS OTP verification provider, integrate the service into your existing systems by following instructions to implement their API.

Step 2: Test the SMS OTP Verification

Testing the SMS OTP verification service is necessary to ensure it works as expected. Send test messages to ensure that OTPs are delivered to users’ mobile phones and verify that the system accepts the OTPs.

Step 3: Roll Out the SMS OTP Verification Service

After testing the SMS OTP verification service, it’s time to roll it out to your customers. Be sure to communicate the new security measures to your customers and guide them in using the service.

Getting started with OTP Verification via SMS with Esendex

At Esendex, we make it easy to get started with our OTP verification service through SMS. Follow these steps:

  1. First, you will need an Esendex account. If you don’t have one already, sign up here.
  2. Next, browse our SMS packages and choose the one that best suits your needs.
  3. Integrate our API into your app or website.
  4. Enable OTP verification through SMS in your Esendex account settings.
  5. Start using our OTP verification service through SMS to secure your online accounts and transactions.

Products for a range of use cases


Texting API designed to send & receive SMS & MMS globally using a short code or 10DLC number.

SMS Software

Easy to use SMS software that can send & receive SMS & MMS using a short code or 10DLC number.

Voice Broadcast

Powerful voice API that sends mass automated phone calls quickly to mobile & landline devices.

Phone Verification

Verify mobile & landline numbers, find service providers, & define time zones to restrict calling.

Let’s start sending, together.