Questions and Answers

NumCheckAPI is designed to verify users' phone numbers without SMS. It is ideal for: new user registration, two-factor authentication (2FA), login confirmation, account recovery, and any scenario where you need to confirm that a user owns a given phone number. The service works for IT projects, websites, and mobile apps of any scale.

NumCheckAPI has several key advantages over SMS: the incoming call arrives instantly (SMS can be delayed up to 5 minutes), the code is visible on the phone screen without even picking up the handset, the service works with any number — including landlines and corporate phones, a flat rate of 0.003 EUR applies to all operators and countries worldwide, and the overall cost of verification is up to 90% lower than SMS.

The verification process is straightforward: your service sends the user's phone number to our API. NumCheckAPI then calls the user from a number whose last 4 digits are a randomly generated code — those same digits are returned to you in the server response. The user sees these digits on their screen during the incoming call and enters them in your app. Verification is completed on your side by comparing the entered code with the expected one.

NumCheckAPI operates on a prepaid balance system. You top up your account with any amount, and each verification request deducts 0.003 EUR from your balance. There are no monthly fees, no minimum top-up requirements, and no commitments — you only pay for the requests you actually use. Top-ups are available from any country in any currency with automatic conversion to EUR.

NumCheckAPI is designed to verify users' phone numbers without SMS. It is ideal for: new user registration, two-factor authentication (2FA), login confirmation, account recovery, and any scenario where you need to confirm that a user owns a given phone number. The service works for IT projects, websites, and mobile apps of any scale.

NumCheckAPI has several key advantages over SMS: the incoming call arrives instantly (SMS can be delayed up to 5 minutes), the code is visible on the phone screen without even picking up the handset, the service works with any number — including landlines and corporate phones, a flat rate of 0.003 EUR applies to all operators and countries worldwide, and the overall cost of verification is up to 90% lower than SMS.

The verification process is straightforward: your service sends the user's phone number to our API. NumCheckAPI then calls the user from a number whose last 4 digits are a randomly generated code — those same digits are returned to you in the server response. The user sees these digits on their screen during the incoming call and enters them in your app. Verification is completed on your side by comparing the entered code with the expected one.

NumCheckAPI operates on a prepaid balance system. You top up your account with any amount, and each verification request deducts 0.003 EUR from your balance. There are no monthly fees, no minimum top-up requirements, and no commitments — you only pay for the requests you actually use. Top-ups are available from any country in any currency with automatic conversion to EUR.