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One-Time Password: Protect your Customers and Secure Transactions


Assured Deliverability

Deliver one-time passwords within few seconds with the highest SMS priority

Secure & GDPR Compliant

Protect your business by implementing an extra security layer that strengthens your security and GDPR compliance.

Easy API

Test in seconds. Integrate in minutes. Create an account in our platform and test OTP immediately.

What is OTP?

A one-time password (OTP) is an automatically generated numeric or alphanumeric code sent via SMS to the user’s mobile phone. It’s valid for a short time and only for single login or transaction. Then, the user receives the OTP and enters it on the device where the authentication is happening.

What is OTP?

OTPs delivered through text messages prevent phishing and malicious attacks, and it’s one of the most popular mechanisms used by companies worldwide to make sure that an authorized person has generated the login or transaction request.

What are the advantages of our OTP service?

  • Determine your OTP code length and use letters and numbers
  • Personalize sender: Send from your company name, so the recipients recognize you straight away (upon country/network availability)
  • Decide code format: Usage of upper and lowercase, special characters, remove confusing characters.
  • Security: Determine valid period. Allow/Restrict IP, Determine the maximum number of wrong attempts.

A Fully Customizable Handkey solution for OTP

OTP Code generated in a few clicks

Frequently Asked Questions

OTP means One Time Password: it’s a temporary, secure PIN code sent to you via SMS valid for one session.

One-time passwords are based on an algorithm that creates a new and random code each time a password is requested. But to fully understand how an OTP works, there are two components to consider: the OTP generator and the authentication server

One-time passwords (OTPs) are an authentication method commonly used as part of two-factor identification (2FA) and multi-factor authentication (MFA) that can help balance these needs.

OTP generation algorithms typically make use of pseudorandomness or randomness to generate a shared key or seed, and cryptographic hash functions, which can be used to derive a value but are hard to reverse and therefore difficult for an attacker to obtain the data that was used for the hash.

An OTP is more secure than a static password, especially a user-created password, which can be weak and reused across multiple accounts. OTPs may replace authentication login information or may be used in addition to it to add another layer of security

Multi-Factor Authentication (MFA) is a type of authentication that requires two or more factors of authentication. Two-Factor Authentication (2FA) is a type of authentication that requires exactly two factors of authentication

Every Two-Factor Authentication is Multi-Factor Authentication buy Not every Multi-Factor Authentication is Two-Factor Authentication

Yes, you can do this very simply by just using a switcher and enabling SMS via voice.

Yes, but you must know that this option is not always available. It depends on the country and mobile network of the recipient.

Sometimes some characters can be confusing and create frustration for the user. You can simply remove these symbols while creating OTP using our generators. One example that will help you understand confusing character are the number zero and letter “o”: ‘0,O’