Numverify

Overview

Numverify is an API service specializing in real-time phone number validation and lookup. Developed by apilayer GmbH, the platform launched in 2012 with the goal of providing developers with a reliable method to verify the authenticity and characteristics of phone numbers globally. The API processes standard GET requests, returning structured JSON responses containing details such as validity status, country prefix, carrier, and line type (e.g., mobile, landline, VoIP). This functionality is relevant for a range of applications, from e-commerce platforms seeking to reduce fraud during user registration to marketing systems aiming to refine contact lists and improve delivery rates for SMS campaigns.

The service is designed to address challenges related to data quality and user verification. By integrating the Numverify API, businesses can automatically check submitted phone numbers at the point of entry, preventing invalid or malformed numbers from entering their databases. This can lead to a reduction in operational costs associated with failed deliveries or incorrect customer contact information. For instance, a common use case involves validating phone numbers during account creation flows to ensure users provide legitimate contact details, a practice that can deter bot registrations and mitigate spam. The API's ability to identify the country associated with a number also supports internationalization efforts, allowing applications to tailor user experiences based on geographic location.

Numverify offers clear documentation and code examples in several popular programming languages, including PHP, Python, and cURL, facilitating integration into existing systems. The API's straightforward request-response model contributes to a streamlined developer experience. Beyond basic validation, the service provides insights into the mobile network operator and line type, which can be valuable for routing communications or segmenting users. For example, knowing if a number is a landline or mobile can inform whether to send an SMS or attempt a voice call. Organizations that handle customer data, manage online accounts, or conduct global outreach can utilize Numverify to maintain data integrity and enhance security protocols.

Key features

• Real-time validation: Instantly check the validity of any international phone number through a simple API call.
• Number information lookup: Retrieve details such as country, country prefix, carrier name, and line type (mobile, landline, VoIP).
• International coverage: Supports phone number validation for over 230 countries and territories globally.
• Fraud prevention: Helps identify and block invalid or suspicious phone numbers during user sign-ups or transactions.
• Data quality improvement: Ensures that databases contain accurate and deliverable phone numbers, reducing bounce rates for communications.
• Developer-friendly API: Utilizes a RESTful interface with JSON responses and provides documentation with code examples in various languages on the Numverify developer documentation.

Pricing

Numverify offers a free tier for initial testing and evaluation, alongside several paid plans designed to accommodate varying request volumes. Pricing is structured based on the number of API requests per month.

Pricing data as of 2026-05-28. For the most current and detailed pricing information, refer to the official Numverify pricing page.

Common integrations

Numverify's API can be integrated into various systems and workflows where phone number validation is required. Its RESTful nature allows for broad compatibility:

• CRM systems: Integrate with platforms like Salesforce to validate customer phone numbers upon entry or update, ensuring data accuracy.
• E-commerce platforms: Use during checkout or account registration processes to verify customer contact information and reduce fraud.
• Marketing automation tools: Validate phone lists before initiating SMS campaigns or telemarketing efforts to improve efficiency and reduce costs associated with invalid numbers.
• User authentication systems: Enhance security by validating phone numbers used for two-factor authentication (2FA) or password recovery.
• Cloud platforms: Deploy within serverless functions or containerized applications on providers such as Google Cloud or AWS API Gateway to add validation capabilities to microservices.
• Custom web and mobile applications: Embed validation logic directly into front-end or back-end codebases using available Numverify API examples.

Alternatives

Several other services provide phone number validation and lookup capabilities:

• Twilio Lookup: Offers phone number validation, formatting, and carrier information, often used alongside Twilio's communication APIs.
• AbstractAPI Phone Validation: Provides an API for validating and enriching phone number data with carrier, location, and line type details.
• Lob Phone Verification: Focuses on verifying phone numbers to ensure deliverability and helps prevent fraud, often integrated with address verification services.
• PayPal Identity API Phone Verification: A service for verifying phone numbers as part of user identity checks within the PayPal ecosystem.
• SparkPost Phone Validation API: Offers phone number validation as part of its email and messaging platform, useful for overall contact data hygiene.

Getting started

To begin using Numverify, developers typically sign up for an API key on the Numverify website. Once an API key is obtained, requests can be made to the API endpoint. The primary method involves an HTTP GET request to the validation endpoint, passing the phone number and API key as parameters. The API then returns a JSON object containing the validation results.

Below is a cURL example demonstrating how to validate a phone number. This example checks the validity of a hypothetical phone number, retrieving its country, carrier, and line type.

curl -X GET 'http://apilayer.net/api/validate?access_key=YOUR_ACCESS_KEY&number=14158586273&country_code=US&format=1'

Upon successful execution, the API will return a JSON response similar to this, indicating the number's validity and associated details:

{
    "valid": true,
    "number": "14158586273",
    "local_format": "4158586273",
    "international_format": "+14158586273",
    "country_prefix": "+1",
    "country_code": "US",
    "country_name": "United States of America",
    "carrier": "AT&T Mobility",
    "line_type": "mobile"
}

Developers can find further code examples and detailed API reference in the official Numverify documentation, covering various programming languages and specific use cases for parsing the API's comprehensive JSON responses.