Dexatel Verify API: Your Guide to Phone Number Validation

Diana Nersisyan
Diana NersisyanProduct Owner

Published: Oct 19, 2023

Verify API

It goes without saying that accurate customer information plays a critical role in creating personalized experiences and building trust. Phone number verification is integral to this process.

This empowers businesses with the confidence they need to connect with their audience at scale while combating fraud, and that’s where the Verify API enters the scene.

What is a Verify API?

A Verify API is a vital tool that businesses can use to validate and authenticate international phone numbers. It offers features like valuable geographical identifiers, location data retrieval, line type detection, and validating numbers using their unique international dial codes.

Thanks to this tool, organizations can build strong customer relationships while minimizing the risk of fraud as well as boosting communication efficiency. 

How Does It Work?

Verify API works by validating phone numbers and providing additional data like carrier, location, and line type. They send verification codes via mobile communication channels like SMS.

If the phone number doesn’t belong to the user, the code expires. This prevents unauthorized access. For users with landlines, the APIs also allow the codes to be heard through an automated voice call, providing omnichannel verification solutions. 

Benefits of Verify API

Sending a verification code is quite beneficial to the user, but integrating the API is just as valuable to the business itself. You want to protect your website and be free of risks.

Compliance With Regulation

The tool guarantees that the phone number verification process follows data privacy laws and regulations. This ensures the secure handling of customer data, giving you peace of mind that you’re compliant with legal requirements like the Telephone Consumer Protection Act (TCPA). 


Implementation can be quite cost-effective, especially when you compare it to manual verifications. It minimizes the need for manual work and associated expenses while maintaining precision. 

Text Message API Service Pricing

Dexatel employs a pay-as-you-go approach that charges you per sent message. This is the most affordable SMS gateway pricing model, and the service costs are free of setup, monthly, or any other fees.

Intelligent Auto-Check

Verify APIs typically offer intelligent features that will automatically check user data against reliable databases. This speeds up the verification process and makes it more accurate, mitigating the risk of human error and simplifying the user experience.

Automated OTP Handling

Another key advantage is the ability to automate one-time password (OTP) handling for user verification. By sending OTPs straight to the user’s mobile device, this streamlines the customer experience, eliminates the need for manual input, and minimizes the risk of fraud. 

Proactive Security

By actively verifying user identities and transactions, Verify APIs can bolster security. They help block any unauthorized access to services, guaranteeing that nobody other than authorized users gets access.

Other security measures involve using HTTPS to ensure the transmission of data between clients and servers are encrypted.

Insightful Activation Metrics

When it comes to the activation and verification process, Verify APIs offer key data and metrics. You can gain valuable insights into the success rates of performance indicators like verification attempts and user engagement. This allows for continuous enhancements in verification methods.

Key Features

Validation of Phone Numbers

International phone number validation is key for companies that operate globally. It helps maintain accurate and up-to-date phone number information.

Line Type Detection and Fraud Monitoring

Line type detection and fraud monitoring help businesses reduce undelivered messages and protect against fraud. With fraud monitoring, Verify APIs fight spam and botnets. Line type detection recognizes the type of phone number in use to ensure accurate communication. 

The intelligent failover feature allows for the automatic resending of PIN codes using text-to-speech (TTS) with a single API request. This enhances the efficiency and reliability of the verification process. 

Activation Rate Statistics

Verify APIs offer activation rate statistics that are essential for evaluating how effective the verification process is. This enables companies to monitor and analyze the rate of verification attempts that succeed in activating user accounts or completing an action like a password reset or account recovery. 

By tracking activation rates, companies can find out how their verification system is performing. Low activation rates can point to issues in the verification process, like technical difficulties or incorrect customer data.

Suspicious Request Blocking

Many Verify APIs have a feature that automatically detects and blocks suspicious quests for verification. These often originate from users or sources with suspicious patterns.

These can include unusual IP addresses and several failed attempts. Blocking these requests helps eliminate the risk of unauthorized access or brute-force attacks and reduce fraud.

In addition to protecting user accounts and data, this safeguards the integrity of the verification process. The dedicated security measure serves as an added layer of protection and optimizes the general security of the service or app.

Use Cases

Two-Factor Authentication

One of the most common use cases of Verify APIs is two-factor authentication. By delivering one-time passwords to users via SMS or other channels to ensure that only authorized users have access to their accounts.

This extra layer of security is crucial for applications that deal with sensitive information or financial transactions

Password Resets and Account Recovery

In cases of locked accounts or forgotten passwords, applications can use Verify APIs to safely confirm user identity and allow users to reset their passwords or recover their accounts.

By receiving verification codes from channels like SMS, users can regain access. This reduces the need for contacting support and improves the user experience. 

Transaction Verification

Verify APIs provide secure transaction verification for applications like banking and eCommerce that involve financial transactions. Users can receive one-time passwords to verify their identities before placing an order or authorizing a transfer, preventing fraud and protecting financial information. 

User Registration and Authentication

On top of that, it also facilitates user registration and authentication. By delivering verification codes to new users during registration, they confirm contact information and minimize the risk of fake accounts. Existing users, on the other hand, can verify their identity when logging in, maintaining the security of their accounts. 

Updating Personal Information

When a user updates their personal information, like a phone number or email address, Verify APIs ensure that the updates are secure. They send verification codes to the new phone number or email to confirm the user’s identity and prevent any unauthorized changes. 

Who Uses Verify APIs for International Phone Number Validation?

Social Media Platforms

On social media platforms, Verify APIs help manage user accounts as they provide lookup services and phone number validation. They allow social networks to authenticate user phone numbers during app registration. By doing so, they prevent the creation of spam or fake accounts and guarantee the integrity of the app. 

Businesses can also use them for two-factor authentication, where users need to confirm their phone numbers for better account security.

Online Retail

eCommerce and online retail businesses use Verify APIs to conduct a range of validation and verification tasks. These can include verifying customer details like addresses, phone numbers, and other information the buyer enters on the website.

The APIs ensure that the customer information is valid and accurate, minimizing the risk of fraud and errors. They can also be useful for authenticating third-party sellers on online marketplaces, adding an extra layer of security and trust for customers. 

Financial Services

In the financial services industry, Verify APIs ensure the security of transactions and the authenticity of customers. Banks, insurance companies, and other financial institutions utilize these APIs to authenticate both international and national numbers during account creation, transaction verification, and two-factor authentication. 

This helps prevent fraudulent activities, bolsters the security of online transactions, and offers a seamless experience for customers. The use of these APIs in the financial sector is key to maintaining adherence to data protection and customer verification regulations. 

Choosing the Right API

Picking the right verification API depends on a number of factors, like features, pricing, and scalability. You’ll find unique advantages and capabilities, so make sure to carefully evaluate these factors and choose the API that best suits your business needs.

How much does it cost to pay for each SMS or voice verification request? Consider the rate for messaging and voice services, as well as the special features and benefits that the API provides.

Scale for Reliability

Another key factor to account for is scalability. Without scalability, APIs can be prone to poor usability, limited availability, and security vulnerabilities. Scalability allows the API to adjust to varying levels of load, offering a dependable and effective means for phone number verification and lookup.

Dexatel’s Verify API 

As a top Verify API provider, Dexatel equips businesses with secure and comprehensive phone number verification solutions. The API presents a solid set of features designed with optimal data security and user verification in mind. 


  • SMS and flash calls: Dexatel’s verify API allows the delivery of number verification tokens via SMS message and flash call, creating convenience and flexibility for verification 

  • Fraud detection: Using advanced algorithms, the API can detect and prevent fraudulent activities

  • Global coverage: Dexatel’s global reach allows businesses to validate phone numbers from around the world

  • Customizable user experience: Businesses can use Dexatel’s Verify API to customize the verification process to meet specific needs, enhancing customer experience


One significant aspect of Dexatel’s Verify API is that it prioritizes adherence to data protection regulations. As a matter of fact, Dexatel itself is compliant with the General Data Protection Regulation (GDPR). The company’s compliance with GDPR guarantees that it handles any personal information that it gathers and processes during verification with high standards of data privacy and protection.

Businesses that use Dexatel’s multichannel verification API can rest assured that they are implementing a user verification solution that boosts security and user experience in addition to upholding the protection of user data in accordance with the GDPR.


The price for using Dexatel’s verification API to send one-time verification codes via SMS or flash call depends on the country you’re sending the code. For example, delivering a code via text to a user in Colombia costs $0.012, whereas the price is $0.0616 if the destination country is Ireland.

Let’s say you want to use flash calls instead. In this case, expect to pay $0.00188 for Colombia and $0.00775 for Ireland. 


You can integrate Dexatel’s verification API with your application and use texting or voice for two-factor authentication in your onboarding and login flow.

To integrate the API, you’ll want to use the relevant documentation. The API will then create one-time password codes and deliver them via personalized messages or flash calls to your subscribers. Once the subscriber enters the code, the verification API matches it with their phone number.

When implementing the verification API, remember to take the following measures: 

  1. Understanding the API

  2. Planning the integration 

  3. API key and authentication

  4. Integrating the API 

  5. Error handling

  6. Testing and validation

  7. Monitoring and maintenance


You can customize the verification API in a number of ways to meet your business needs. These include:

  • Implementing custom API integrations designed to fulfill the specific requirements of your business

  • Altering the API endpoints

  • Introducing additional validation checks

  • Integrating with other systems or databases