Strengthen Authentication with Email OTP Verification

EMAIL ONE-TIME PASSCODE (OTP)

Email One-Time Passcode (OTP) provides a fast, reliable way to ensure the user actively controls the email inbox of a given email address before granting access to sensitive accounts, applications, or transactions.


Authentication API delivers a complete Email OTP solution through a simple API integration. We generate and deliver secure one-time passcode to the user's email address and validate the code when it is returned.


No email infrastructure. No security headaches. No complex implementation.


Just secure confirmation of email access through a single API.


PRICE: $0.025

HOW EMAIL OTP WORKS

1.  Your application sends an API Request to us.


2.  We generate a temporary, secure one-time passcode that is delivered to the user's email address.


3.  The user enters the code into your application.


4.  Your application submits the code back to us for verification.


5.  We return an API response indicating a successful or failed match.

TECHNICAL DETAILS - EMAIL ONE-TIME PASSCODE

2FA Request: API REQUEST - FROM CUSTOMER TO AAPI

Request:

{"username":"api_user","password":"api_pass","request_type":"2fa","request_date_time":"2026-05-20 16:13:50","email":"user@example.com","type":"email","length":"8","time_limit":"400", "universal_id" :"UNIID_20260520161350"}

2FA Request: API RESPONSE - FROM AAPI TO CUSTOMER

Response:

{"username":"api_user","password":"***********","responseCode":200,"transactionId":"APIREQ_20260520162548","responseDateTime":"2026-05-20 16:13:50","responseData":{"status":true,"responseCode":200}}

2FA Validate: API REQUEST - FROM CUSTOMER TO AAPI

Request:

{"username":"api_user","password":"api_pass","request_type":"2fa","request_date_time":"2026-05-20 16:13:50","email":"user@example.com","type":"validate","code":"39150858","universal_id":"

UNIID_20260520161350"}

2FA Validate: API RESPONSE - FROM AAPI TO CUSTOMER

Response:

{"username":"api_user","password":"***********","responseCode":200,"transactionId":"APIREQ_20260520162548","responseDateTime":"2026-05-20 16:13:50"}

Why Choose Authentication API?

Built for Developers

Simple REST API integration with clear documentation and rapid deployment.   

Secure by Design

OTP codes are generated securely, expire automatically, and can only be used once.  

Reliable Delivery

We manage the delivery infrastructure so your team can focus on building applications.  

Scalable

Whether you're validating hundreds or millions of users, Authentication API scales with your business.

Ready to Strengthen Your Authentication?

Authentication API provides APIs that help organizations improve identity verification, reduce fraud, and strengthen authentication workflows. 

Get Started