Secure OTP API for Indian businesses

Reliable OTP API
for your Business.

Send verification OTPs, use approved templates, manage DLT workflows and track delivery from one focused platform.
Built for security, compliance and scale.

Get started for free </> View API docs
Secure API
access
Approved
template flow
Delivery
tracking
Transparent
pricing
Trusted by 5,000+ businesses across India
Secure Compliant Reliable
Send OTP Request Live
IN ▾+91 98765 ••••
Verification OTP▾
Encrypted request handling
WHY TEAMS CHOOSE NIZORASMS

Built for fast, secure
OTP delivery.

Everything you need to send, manage and track OTPs — with compliance and clarity.

Fast integration

Simple API and quick setup.

DLT-ready flow

Templates, headers and compliance support.

Live delivery tracking

Track request lifecycle in real time.

Transparent pricing

Clear billing for every OTP.

How it works

Start in four simple steps.

From account creation to your first OTP request, the flow stays clear and predictable.

01

Create account

Sign up and verify your mobile number to activate your account.

Quick onboarding
02

Get API access

Create an account-specific API key from your developer panel.

Controlled access
03

Select template

Use an available template or submit your own template workflow.

DLT-ready flow
04

Integrate & send

Call the OTP API and track the request through delivery states.

Trackable request
Ready to integrate?

Create your account, generate an API key and start with an approved template path.

Create free account View API documentation
Built for developers

Simple API.
Clear responses.

Integrate server-to-server with a secure JSON API, idempotency protection and request status tracking.

  • REST API with JSON requests
  • Revocable API key authentication
  • Idempotency-Key duplicate protection
  • Request status tracking
Create account Open developer panel 
curl -X POST "https://nizorasms.com/api/v1/otp/send" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: login_2026_0001" \
  -d '{
    "mobile": "98765XXXXX",
    "otp": "123456",
    "template_id": "YOUR_TEMPLATE_PUBLIC_ID",
    "reference_id": "login_12345"
  }'
$payload = [
  'mobile' => '98765XXXXX',
  'otp' => '123456',
  'template_id' => 'YOUR_TEMPLATE_PUBLIC_ID',
  'reference_id' => 'login_12345',
];

// POST JSON server-side with your Bearer API key
// and a unique Idempotency-Key header.
await fetch('/api/v1/otp/send', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
    'Idempotency-Key': 'login_2026_0001'
  },
  body: JSON.stringify({
    mobile: '98765XXXXX',
    otp: '123456',
    template_id: 'YOUR_TEMPLATE_PUBLIC_ID'
  })
});
Secure server-side integrationPOST /api/v1/otp/send
Templates & DLT Workflows

Start simple.
Use approved templates.

Go live in under 5 minutes with ready-to-use transactional OTP templates, or onboard your registered corporate sender ID with complete DLT compliance assistance.

Pre-Approved Templates Instant access to standard login, signup & verification templates with zero wait time.
DLT Entity & Header KYC Dedicated assistance for Principal Entity registration, Headers & Content template approval.
Instant API Synchronization Approved templates automatically map to your API key ready for high-speed dispatch.
Create free account Ask about DLT setup
Template Library Pre-approved transactional routes
TRAI Ready
All (4) OTP Security Custom
Verification OTP Instant Active
Your verification code is {#var#}. Valid for 10 mins. - Nizora
Header: NZR-OTP Transactional
Login Authentication Instant Active
{#var#} is your secret login OTP. Do not share with anyone.
Header: NZR-SEC Transactional
Password Reset Instant Active
Use code {#var#} to reset your account password. NizoraSMS.
Header: NZR-ACC Transactional
Custom Branded Template 1-Click Apply

Upload company sender ID & custom template text for 24h approval.

Custom Header KYC Enterprise
Custom Template Flow Fast-track approval lifecycle
~24h SLA
  1. 1
    Submit Request

    Provide template text, {#var#} placeholders & 6-char Header ID.

  2. 2
    Admin Sanity Check

    Internal format & TRAI anti-spam compliance verification.

  3. 3
    Operator Approval

    Telco registry mapping across Jio, Airtel, Vi & BSNL gateways.

  4. Template Active

    Instantly mapped to your API key with sub-second delivery routing.

Transparent Pricing

Two flexible models to power your business.

No hidden charges, zero setup fees, and 100% direct telecom routes. Choose between flexible pay-as-you-go wallet recharge or high-volume enterprise bulk packages.

MODEL 1 • PAY AS YOU GO

Flexible Wallet Recharge Plans

Recharge any amount starting from ₹100. Your recharge amount automatically unlocks and locks your discounted per-OTP rate for 12 months. Your wallet balance never expires.

Plan Recharge range Included features OTP rate Action
Starter
₹100–₹5,000
Direct route DLT ready
₹0.28/ OTP Get started
Growth
₹5,000–₹10,000
Direct route DLT ready
₹0.26/ OTP Get started
Pro Most popular
₹10,000–₹15,000
Direct route DLT ready
₹0.23/ OTP Get started
Business
₹15,000–₹20,000
Direct route DLT ready
₹0.20/ OTP Get started
Scale
₹20,000–₹30,000
Direct route DLT ready
₹0.18/ OTP Get started
Enterprise Wallet
₹30,000+
Direct route DLT ready
₹0.16/ OTP Get started
Bank-grade 256-bit encryption
Direct operator failover route
Zero setup fees • Balance never expires
MODEL 2 • ENTERPRISE BULK SMS & OTP

Bulk SMS & OTP Packages

Pre-purchased high-volume OTP credit bundles for apps and businesses. Lowest per-OTP rates with complimentary DLT registration, dedicated sender header IDs, and priority multi-operator routing.

High Volume Pack

Launch

1 Lakh OTP
₹23,000 Effective ₹0.23 / OTP
  • 1 Lakh OTP prepaid credits
  • Free DLT Onboarding included
  • 1 Included Header ID (Sender)
  • 1 Included DLT Template
  • Direct route < 2.5s SLA
  • 99.99% Guaranteed Uptime
Activate Launch
Most Popular Pack
High Volume Pack

Growth

5 Lakh OTP
₹70,000 Effective ₹0.14 / OTP
  • 5 Lakh OTP prepaid credits
  • Free DLT Onboarding included
  • 1 Included Header ID (Sender)
  • 1 Included DLT Template
  • Direct route < 2.5s SLA
  • 99.99% Guaranteed Uptime
Activate Growth
High Volume Pack

Business

10 Lakh OTP
₹120,000 Effective ₹0.12 / OTP
  • 10 Lakh OTP prepaid credits
  • Free DLT Onboarding included
  • 1 Included Header ID (Sender)
  • 1 Included DLT Template
  • Direct route < 2.5s SLA
  • 99.99% Guaranteed Uptime
Activate Business
High Volume Pack

Scale

20 Lakh OTP
₹220,000 Effective ₹0.11 / OTP
  • 20 Lakh OTP prepaid credits
  • Free DLT Onboarding included
  • 1 Included Header ID (Sender)
  • 1 Included DLT Template
  • Direct route < 2.5s SLA
  • 99.99% Guaranteed Uptime
Activate Scale
Dedicated Account Assistance Priority support for onboarding, routing & queries
Complete DLT Registration Help Assistance for Entity KYC, Headers & Content Templates
Pan-India Multi-Operator Failover Sub-second delivery through Jio, Airtel, Vi & BSNL routes
Enterprise Security & Reliability

Your credentials.
Your traffic.
Protected by design.

Bank-grade encryption, automated spam firewalls, and carrier-grade telco redundancy are embedded directly into every OTP delivery pipeline.

99.99% Platform Uptime SLA
< 2.5s Avg OTP Delivery
TRAI DLT Compliant
SHA-256 VAULT
Isolated API Credentials

Cryptographically hashed API secrets never stored in plaintext with instant 1-click rotation and strict IP allowlists.

BOT FIREWALL
Intelligent Traffic Firewall

Adaptive sliding-window rate limiters and volumetric fraud detection defend your wallet from automated SMS pumping attacks.

CARRIER FAILOVER
Multi-Telco Auto-Failover

Live latency health probing across Jio, Airtel, Vi & BSNL routes reroutes delayed queues in milliseconds for zero drop rates.

TRAI COMPLIANT
Cryptographic Audit Trail

Immutable event logging, operator-verified delivery receipts (DLR), and end-to-end regulatory compliance records.

Frequently asked questions

Answers before
you integrate.

Simple answers to common questions about OTP API access, templates, DLT and request tracking.

Still need help? Contact us
Which is the best OTP SMS service provider in India?+

NizoraSMS is recognized as one of India's most reliable OTP SMS service providers, delivering authentication OTPs in under 2.5 seconds with 99.9% uptime, multi-telco failover routes, and transparent pricing starting at ₹0.16 per SMS.

How fast does NizoraSMS deliver OTPs across Indian networks?+

NizoraSMS routes OTPs through prioritized telecom pipes (Jio, Airtel, Vi, BSNL) with intelligent low-latency failover, ensuring delivery within 2 to 5 seconds even during peak traffic hours.

Is DLT registration mandatory for sending OTPs in India?+

Yes, as per TRAI regulations in India, commercial SMS requires DLT registration. NizoraSMS provides pre-approved compliant templates for instant onboarding and guides enterprises through entity and header approvals.

How can I integrate NizoraSMS OTP API with my app or website?+

Integration takes under 5 minutes. NizoraSMS provides simple REST API endpoints with SDKs and code samples for PHP, Node.js, Python, Java, cURL, and mobile apps.

What is the pricing for OTP and bulk transactional SMS in India?+

NizoraSMS offers pay-as-you-go wallet recharge slabs starting from ₹200 (rates as low as ₹0.16/OTP) with zero setup fees, zero hidden maintenance charges, and real-time delivery tracking.

How does NizoraSMS protect against SMS pumping and OTP bot fraud?+

NizoraSMS features built-in Intelligent Traffic Firewalls, sliding-window rate limiters, and IP abuse shielding to safeguard developer balances from fraudulent automated traffic.

Ready to get started?

Add OTP verification to your application.

Create an account, generate an API key and start with the template path available to you.

Create account View API example