No DLT registration required

Send OTPs Without DLT Registration

The most developer-friendly OTP API for India. Authenticate users in minutes with our high-delivery SMS infrastructure. 4-6 digit OTP support, multi-provider failover, and zero DLT registration — all at just ₹0.25 each.

Start Sending OTPsView API Docs

Free to sign up. 40 test messages credited on signup. Pay only for what you send.

8056
< 5 minSetup Time
Rs 0.25Per OTP
99.9%Uptime
0DLT Paperwork

Everything You Need to Send OTPs

A complete OTP platform designed for Indian developers who want reliability without complexity.

No DLT Required

Skip the weeks-long DLT registration process. We handle all compliance so you can focus on building.

5-Minute Setup

Sign up, get your API key, and start sending OTPs. Just a quick verification and you are good to go.

Simple REST API

One POST request to send an OTP. Clean JSON responses. Works with any language or framework.

Multi-Provider Fallback

Automatic failover between SMS providers ensures your OTPs always get delivered.

Idempotent Sends

Built-in idempotency keys prevent duplicate OTP sends even with network retries.

Pay As You Go

No monthly fees. Add funds to your wallet and pay Rs 0.25 per OTP sent.

Real-Time Tracking

Track every message with delivery status updates. Full audit trail for all OTP requests.

Secure by Default

OTP codes are bcrypt-hashed. API keys are SHA-256 hashed. Your data is always protected.

Send an OTP in One API Call

Works with every language. Just a single POST request.

curl -X POST https://api.startmessaging.com/otp/send \
  -H "Content-Type: application/json" \
  -H "X-API-Key: sm_live_your_api_key_here" \
  -d '{
    "phoneNumber": "+919876543210",
    "templateId": "YOUR_TEMPLATE_ID",
    "variables": {
      "otp": "123456",
      "appName": "YourApp"
    }
  }'

How It Works

Go from zero to sending OTPs in three simple steps.

Step 1

Get Your API Key

Sign up and create an API key from the dashboard. It takes less than a minute.

Step 2

Top Up Your Wallet

Add funds to your wallet via Razorpay. Pay as you go for each OTP you send.

Step 3

Send OTPs

Make a single POST request to our API. We handle delivery, retries, and tracking.

Roadmap

Upcoming features

We are investing beyond core SMS OTP: deeper DLT tooling, WhatsApp with campaign scheduling, and SDK-first integrations for mobile teams. Timelines will ship in product changelog order—this is what we are building toward next.

DLT integrations
Deeper connectors for enterprise DLT workflows: header and template lifecycle, scrubbing-aware retries, and operator-specific observability from the same API surface you use today.
WhatsApp messaging and campaign scheduling
Transactional and campaign-style WhatsApp with consent-aware scheduling, quiet hours, and shared wallet semantics next to SMS OTP.
Direct mobile SDK integration
First-party SDKs so Android and iOS apps can verify, autofill, and report delivery without re-plumbing REST for every release train.
Custom feature requests
Many messaging vendors only sell fixed bundles. StartMessaging is different: we are opening a custom engineering lane for serious teams that need bespoke routing, compliance, or channel behaviour.

If you need something that is not on the public roadmap yet, email us at startmessagingdotcom@gmail.com with your volume, timelines, and a short technical brief—we reply to qualified requests with a feasibility note and next steps.

Already live today: OTP API, wallet pricing, and video walkthroughs.

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Frequently Asked Questions

Ready to Start Sending OTPs?

Sign up for free, get 40 test messages credited instantly, and send your first OTP in under 5 minutes. No DLT registration needed.

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