One Time Password

Secure Your Platform with One Time Passwords

Enhance platform security by integrating our Two-Factor Authentication service using One Time Passwords (OTP).

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One-Click Authentication Solutions for All Businesses:

Trusted by Brands Worldwide


Why Choose as Your OTP Provider

Fast delivery of time-critical messages are guaranteed

Our platform is connected to 2000 operators worldwide

Rely on our ISO 27001 certified redundant platform

Benefit from our round-the-clock and in-house support

Get clear control and insights on your costs and traffic

One-Time Password Pricing

One Global Price per Validated OTP

* Excluding channel costs (conversational channels and SMS) per OTP sent.

** Required if custom branding is applicable. SMS is excluded from the one-time setup costs and template updates.

Configure Your Own OTP OTP-as-a-Service
Configure Your Own OTP OTP-as-a-Service


Custom branding

SOLiD branding

Price per verified OTP*

Starting at £0.03

Starting at £0.03

One-time setup costs per channel**

£199,- per channel


Template update**

£49,- per update


* Excluding channel costs (conversational channels and SMS) per OTP sent.

** Required if custom branding is applicable. SMS is excluded from the one-time setup costs and template updates.

Frequently Asked Questions About One Time Passwords

What is a One Time Password?

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A One Time Password or OTP is a security code designed to be used for a single login attempt, to minimise the risk of fraudulent login attempts and maintain high security. It’s a string of characters or numbers automatically generated and sent to the user’s phone via SMS, Voice, or Push message.

The OTP has become the standard method worldwide of enabling a login when special circumstances apply, such as validating a new account or confirming a transaction is legitimate.

How to send One Time Passwords?

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Providers like offer OTPs as a service, with a secure platform for receiving or initiating OTP requests, sending the OTP as a text or other channel, and verifying the OTP was entered correctly, so the transaction can go ahead.

The infrastructure for making use of One Time Passwords integrates with your website or application using an API. This is how a site “knows” whether an entered OTP is correct or not, with safeguards like checking it’s within the time window.

What are One Time Password channels?

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There are several ways to send an OTP. Some give the option of receiving OTPs by email, although this tends to be less secure. Other providers even enable OTPs as voicemails, stating the PIN aloud when the customer checks the mailbox.

But by far the most common way to send OTPs is by Push, SMS or even WhatsApp.

How does a One Time Password work?

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An OTP is generated automatically as a semi-random number or string of characters. There is no way to predict what the OTP will be ahead of time. OTPs are valid for a single login session or transaction, enhancing security by reducing the risk of unauthorised access even if the password is intercepted. Once used, the OTP expires, ensuring it cannot be reused for future logins or transactions.

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