Talk to Sales : +1 (270) 716-7625

What is OTP service?

OTP service is the easiest way of verifying user information and authenticating online transactions. Used by businesses to boost data security and prevent phishing attacks, an OTP service provider ensures timely delivery of OTPs to the right customers via SMSes and voice calls.

Types of OTP services

SMS OTP Service

Send OTPs to your customers using SMSes. Auditcall provides reliable OTP SMS services with high deliverability and low latency.

Voice OTP Service

Verify your customers using voice OTP service. Make automated voice calls and play a sequence of digits to verify the registered mobile numbers.

How can businesses use OTP service

Two-factor authentication (2FA)

Implement an extra layer of security in your systems, without adding complexity to your customers.

Spam prevention

Effectively control spam registrations, and avoid fake signups. Optimize and secure your backend systems against spam.

Password Resets

Instead of sending codes or links via email, use the OTP service to verify users before password resets.

Passwordless logins

Do away with passwords as your customers can be verified using an OTP every time they log in to your system.

Account Reactivations

Reactivate a user account with a confirmed acceptance from them. Use OTP verification as a means of verifying identity.

Transaction Authentication

Keep all transactions safe and sound. Add an additional layer of security with OTP verification to ensure safe transactions.

How It Works - 3 Simple Steps


Choose Your Number

Select a local, national or toll-free number from our vast inventory



Let us handle the sign-up - it takes just 3 minutes


Receive Calls

Immediately start receiving calls and servicing your customers

Advantages of Using Auditcall REST APIs

Enable customers to self-serve

Automate responses to common customer queries & enable them to perform basic operations using IVR like finding out their bank balance, cancelling a ticket, etc.

Safeguard customers’ privacy

Using number masking, you can safeguard the privacy of both the callee and the caller. Contact details of both parties are hidden behind a virtual number.

Increase productivity

Leverage our click-to-call API to integrate telephony with your CRM, helpdesk or app. Make calls at the click of a button, without having to dial any numbers manually.

Enhanced call tracking

Auditcall records and monitors every call made. With our call details API, you can fetch call details automatically for increased visibility and insight.

Advantages of Using OTP Services


Auditcall is an OTP service provider that grows with you. Pay as you scale and never overspend on your resources.

No Delay

Don’t keep a customer waiting for any more than 8 seconds. Our OTP service ensures timely delivery of the OTP messages.

Operational Efficiency

Send thousands of OTP verification messages without having to run multiple numbers. Our OTP service can handle them all!

Still not sure? Request a Demo

Need More Help?