Twilio vs StartMessaging for OTP in India

Twilio is the default choice for many developers when they think about sending SMS. It is a massive platform with global reach and a broad product portfolio. But if you are building in India and your primary use case is OTP verification, Twilio may not be the best fit. In this article, we do a head-to-head comparison of Twilio and StartMessaging for Indian OTP use cases, covering pricing, DLT requirements, API design, and real-world delivery performance.

Overview

Twilio is a San Francisco-based cloud communications platform offering SMS, voice, video, email, and more. It serves customers globally and supports India through local and international routes. Twilio Verify is its dedicated OTP product.

StartMessaging is an India-focused OTP API built specifically for Indian developers. It offers two endpoints (send OTP and verify OTP), flat pricing at Rs 0.25 per OTP, INR wallet billing, and no DLT registration requirement. It is designed to do one thing well: deliver OTPs in India quickly and affordably.

Pricing Comparison

This is where the difference is most stark. Let us break down the real cost of sending OTPs with each provider:

If you use Twilio Verify (their managed OTP product), you pay $0.05 per successful verification rather than per-SMS pricing. That works out to approximately Rs 4.17 per OTP. If you build OTP logic yourself on top of Twilio SMS, you pay the per-SMS rate plus your development time.

Cost at Scale

At 100,000 OTPs per month, you save nearly Rs 4 lakh per month by choosing StartMessaging over Twilio Verify. See our pricing page for the latest rates.

DLT Compliance

TRAI requires all commercial SMS senders in India to register on a DLT platform. This means registering your business entity, creating sender IDs, and submitting message templates for approval. The process typically takes 3-7 business days and requires PAN, GST, or other business documentation.

Twilio requires you to complete DLT registration yourself. You must register on a DLT platform (Jio, Airtel, Vi, or BSNL), get your entity approved, register your SMS templates, and then link your DLT credentials to your Twilio account. Until this is done, you cannot send SMS to Indian numbers.

StartMessaging does not require DLT registration from you. We handle all DLT compliance using our pre-approved routes and templates. You can start sending OTPs within minutes of creating your account. Learn more about DLT-free OTP sending.

Billing and Currency

Twilio bills in USD. If your business operates in India, this means:

• You pay forex conversion fees (typically 2-3%) on every payment
• Your costs fluctuate with the USD/INR exchange rate
• Accounting and GST reconciliation is more complex with foreign currency invoices
• Credit card international transaction fees may apply

StartMessaging bills in INR via a prepaid wallet. You top up your wallet using UPI, net banking, or cards with no forex fees. Your invoices are in INR with proper GST, making accounting straightforward.

API Design and Developer Experience

Twilio is a powerful platform with hundreds of products, which means its API surface area is large. To send an OTP, you typically need to:

1. Create a Twilio account and get your Account SID and Auth Token
2. Install the Twilio SDK for your language
3. Create a Verify Service via the console or API
4. Complete DLT registration and link it to your account
5. Call the Verify API to send and check OTPs

With StartMessaging, the process is:

1. Sign up and get your API key
2. Call POST /otp/send with the phone number
3. Call POST /otp/verify with the OTP code

No SDK required. No service configuration. No DLT paperwork. Just a REST API with two endpoints. Read the full API documentation on our OTP API reference.

Code Comparison

Sending an OTP with StartMessaging

// No SDK needed — plain fetch
const res = await fetch('https://api.startmessaging.com/otp/send', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer sm_live_your_api_key',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ phoneNumber: '+919876543210' }),
});

const { data } = await res.json();
console.log('OTP Request ID:', data.requestId);

Verifying an OTP with StartMessaging

const res = await fetch('https://api.startmessaging.com/otp/verify', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer sm_live_your_api_key',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    requestId: 'req_abc123',
    otp: '482916',
  }),
});

const { data } = await res.json();
console.log('Verified:', data.verified); // true

Sending an OTP with Twilio Verify

// Requires: npm install twilio
const twilio = require('twilio');
const client = twilio(
  'YOUR_ACCOUNT_SID',
  'YOUR_AUTH_TOKEN'
);

// You must create a Verify Service first in the Twilio Console
const verification = await client.verify.v2
  .services('VA_YOUR_SERVICE_SID')
  .verifications.create({
    to: '+919876543210',
    channel: 'sms',
  });

console.log('Status:', verification.status);

Verifying an OTP with Twilio Verify

const check = await client.verify.v2
  .services('VA_YOUR_SERVICE_SID')
  .verificationChecks.create({
    to: '+919876543210',
    code: '482916',
  });

console.log('Status:', check.status); // 'approved'

The Twilio approach requires an SDK dependency, account credentials management (SID + Auth Token), and pre-configuration of a Verify Service. The StartMessaging approach uses standard HTTP with a single API key.

Feature Comparison Table

Delivery Performance in India

Twilio routes Indian SMS through international and local gateways. While generally reliable, some developers report lower delivery rates on BSNL and Vi networks compared to providers that use purely domestic routes.

StartMessaging uses domestic SMS providers (including Twilio and MSG91 as underlying providers) with automatic fallback. If the primary provider fails to deliver an OTP, the system automatically retries through a secondary provider. This multi-provider approach results in delivery rates of 97-99% across all major Indian carriers.

For more details on carrier-specific delivery rates, see our article on OTP delivery rates in India.

When to Choose Twilio

Twilio is a better choice when:

• You need to send SMS to multiple countries, not just India
• You need voice calls, WhatsApp, or email in addition to SMS
• Your company already has a Twilio account and established workflows
• You need enterprise-grade SLAs with contractual delivery guarantees
• Your billing and accounting team is comfortable with USD invoicing

When to Choose StartMessaging

StartMessaging is the better choice when:

• Your users are in India and you need OTP verification specifically
• You want the lowest cost per OTP without volume commitments
• You do not want to deal with DLT registration paperwork
• You prefer INR billing with simple prepaid wallet top-ups
• You want to go from zero to production OTP in under 5 minutes
• You want automatic multi-provider fallback for maximum delivery rates

Get started now at the StartMessaging pricing page or check the API documentation.

Migrating from Twilio to StartMessaging

If you are currently using Twilio and want to switch to StartMessaging, the migration is straightforward:

1. Sign up at dashboard.startmessaging.com and create an API key
2. Replace the send call: Replace your Twilio Verify verifications.create() with a POST /otp/send call
3. Replace the verify call: Replace verificationChecks.create() with POST /otp/verify
4. Remove the Twilio SDK from your dependencies if it was only used for OTP
5. Top up your wallet with INR and you are ready to go

Most developers complete the migration in under an hour. For a broader comparison of all providers, see our best OTP API for India guide.