Top OTP (One Time Password) APIs

Top OTP and Verification APIs

About this Collection:

One Time Password API

About One Time Password APIs

Efficiently generate and manage temporary passwords with one time password APIs.

What is a one time password API?

A one time password (OTP) application programming interface (API) is a RESTful web service. It enables developers to integrate into their projects the functionality to generate single-use, temporary passwords.

How does an OTP API work?

An OTP API utilizes the POST request method to make API calls. Developers embed endpoints into their client applications or websites. Endpoints connect the requests to the data resources provided by the API. Responses are returned in standard JSON formatting.

Who is an OTP API for exactly?

Developers that want to add another layer of security to their websites or client applications will find APIs for OTP’s helpful.

Businesses will also benefit from using one time password APIs. Some examples are online banking institutions, legal organizations, and other entities that handle sensitive information.

Why is an API for one time passwords important?

Developers can add the one time password functionality without having to learn, write, test, and debug the code. A one time password API enables developers to expedite the launching of their projects.

OTP APIs give business applications an extra layer of security with strong authentication. This is in high contrast to static passwords which systems vulnerable to unauthorized access to sensitive data.

An API for one time passwords may come in handy when a customer or employee forgets their password too. If the lost password falls into the wrong hands, a one time password security protocol can prevent an imposter from logging onto the account.

What can you expect from an API for one time passwords?

Developers can count on building projects with extra security measures that their clients will appreciate.

Businesses can expect to take advantage of the security benefits of a one time password API. The interface generates random numbers that are challenging to guess. Even if a weak user password is compromised, and OTP will help prevent unauthorized access.

Are there examples of free OTP APIs?

RapidAPI’s Marketplace lists several free and freemium APIs for one time password generation. Two free OTP APIs are D7 Verify by D7admin and ShoutOUT OTP by ShoutOUT. Both APIs allow users to send one time passwords to mobile numbers. They also feature unlimited requests.


  1. D7 Verify
  2. Shoutout OTP
  3. Nexmo Verify
  4. Telesign Voice Verify
  5. Twilio Verify Phone Number


All OTP APIs are supported and made available in multiple developer programming languages and SDKs including:

  1. Node.js
  2. PHP
  3. Python
  4. Ruby
  5. Objective-C
  6. Java (Android)
  7. C# (.NET)
  8. cURL

Just select your preference from any API endpoints page.

Sign up today for free on RapidAPI to begin using OTP APIs!