OTP Authentication API for SaaS Platforms

Core Capabilities

REST API Integration

Trigger OTP with a single API call, verify with a second.

Sub-5-Second Average Delivery

For login-critical OTP.

SMS and WhatsApp OTP

Use one or both, with automatic fallback options.

Multi-Tenant Support

Different business customers on your platform can use independent sender IDs.

Rate-Limiting & Fraud Protection

Built in to prevent OTP abuse.

Quick Answer — OTP Authentication API for SaaS Platforms

MetaReach's OTP API lets SaaS platforms trigger login/signup OTP via a single REST call, with sub-5-second average delivery, SMS-and-WhatsApp fallback, multi-tenant sender-ID support, and built-in rate-limiting to prevent abuse.

Integration Pattern

How Integration Works

A typical OTP login flow, end to end.

Integration Flow

Your app calls MetaReach's OTP API with the user's phone number

MetaReach sends the OTP via SMS/WhatsApp

User enters the code in your app

Your app calls MetaReach's verification endpoint to confirm

Webhook delivers real-time delivery status to your system

Go Further

When OTP Is Just the Start

Login verification is one piece of a SaaS platform's communication needs — these resources round out the rest.

WhatsApp API for SaaS Notifications

In-app alerts and updates delivered via WhatsApp.

Explore WhatsApp Notifications

Bulk SMS for ERP Alerts

Invoice, inventory, and HR/payroll alerts at scale.

Explore ERP Alerts

Messaging API Integration Guide

Full REST API docs, webhooks, and sandbox environment.

View Integration Guide

White-Label Messaging for SaaS Resellers

Resell this infrastructure under your own brand.

Explore White-Label Options

SaaS & ERP Use Cases

See how SaaS platforms and ERP providers use this infrastructure.

View Use Cases

OTP & SMS Services

MetaReach's general-purpose OTP and transactional SMS pillar.

View OTP & SMS Services

Email API for Transactional Emails

Password resets, receipts, and system alerts.

Explore Transactional Email

IVR for SaaS Customer Support

Voice-based support routing and escalation.

Explore IVR for Customer Support

Need the rest of the SaaS & ERP communication stack? See the SaaS & ERP Messaging Solutions pillar for WhatsApp, SMS, Email, IVR, and API integration in one place.

Common Questions

Frequently Asked Questions

Can this handle high login volume during traffic spikes?

Yes — the infrastructure is provisioned for burst capacity, not just average-day volume.

Is DLT registration required?

Yes, for production SMS OTP in India. MetaReach handles sender-ID registration as part of onboarding. See DLT Registration Support.

Can I use this for a multi-tenant SaaS platform where each business customer needs their own sender ID?

Yes — per-tenant configuration is supported.

Is there a sandbox for testing before going live?

Yes — see our Messaging API Integration Guide for sandbox access details.