OTP SMS API India for Apps & Websites
Use an OTP SMS API and verification gateway to send sign-in, signup and transaction OTPs from your app or website in India. Compare approved DLT templates, OTP SMS pricing, integration examples, delivery-status checks and onboarding before production.
curl -X POST https://nizorasms.com/api/v1/otp/send \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"mobile": "9876543210",
"otp": "492815",
"template_id": "TPL_DEFAULT_OTP"
}'Why Indian Developers & Businesses Choose NizoraSMS for OTPs
Plan your integration for the Indian telecom ecosystem with appropriate DLT templates, retry handling and delivery-status checks.
Dedicated OTP Pipes
OTP traffic should use the applicable approved templates and routes. Check the active messaging category, send response and delivery status before production rollout.
SMS Pumping & Bot Firewall
Reduce OTP abuse by applying recipient and IP rate limits, verification cooldowns, server-side OTP generation and monitoring. Review the controls available on your plan.
Carrier-Level Failover
Carrier delays and route changes can affect delivery. Check available fallback routing with support and use delivery receipts to decide when a retry is appropriate.
DLT Template Assistance
Confirm the applicable Principal Entity, Header and Content Template approvals for your use case before live messaging.
Real-time Delivery Logs (DLR)
Track delivery status with transparent timestamps, operator DLR receipts, and latency breakdown directly in your dashboard or through automated webhooks.
Transparent Indian Pricing
Check current wallet plans, any setup charges, applicable GST and per-message deductions before purchase. Compare the total cost for your OTP traffic.
OTP SMS API Integration for PHP and Node.js Backends
Use server-side SMS OTP API calls, keep your key private and test authentication, request fields and delivery errors before going live. Examples are illustrative; use the template assigned to your account.
<?php
$payload = json_encode([
'mobile' => '9876543210',
'otp' => '654321',
'template_id' => 'TPL_LOGIN_OTP'
]);
$ch = curl_init('https://nizorasms.com/api/v1/otp/send');
curl_setopt_array($ch, [
CURLOPT_RETURNTRANSFER => true,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $payload,
CURLOPT_HTTPHEADER => [
'Authorization: Bearer ' . $apiKey,
'Content-Type: application/json'
]
]);
$response = curl_exec($ch);
curl_close($ch);const axios = require('axios');
async function sendOtp(phone, otpCode) {
const res = await axios.post('https://nizorasms.com/api/v1/otp/send', {
mobile: phone,
otp: otpCode,
template_id: 'TPL_LOGIN_OTP'
}, {
headers: {
'Authorization': `Bearer ${process.env.NIZORA_API_KEY}`,
'Content-Type': 'application/json'
}
});
return res.data;
}Choose an OTP SMS API in India: pricing, DLT templates and delivery checks
Compare the actual requirements for login verification, registration OTP and account recovery before purchasing an SMS OTP gateway.
OTP SMS API pricing
Review current wallet slabs, minimum recharge, applicable taxes and your expected monthly OTP traffic. See NizoraSMS pricing plans before deciding.
Approved OTP template onboarding
Eligible developer testing may use a provider-operated approved header and standard OTP wording. Your own sender name or custom content needs the applicable DLT onboarding. Read the DLT template guide.
Reliable OTP gateway integration
Keep verification and API credentials on your backend, rate-limit sends, record request IDs and check delivery reports. Use the developer integration guide for testing and errors.
Frequently Asked Questions — India OTP SMS Services
Everything you need to know about OTP delivery speed, DLT compliance, pricing, and API reliability.
What is an OTP SMS API?
An OTP SMS API lets an application trigger a one-time-password message during registration, sign-in or transaction verification. Your backend should create and validate the code, apply expiry and rate limits, and avoid logging the code.
How do I choose an OTP SMS provider in India?
Compare documentation, approved DLT onboarding, delivery-status visibility, support response, pricing after taxes and actual delivery performance measured with your own test traffic. Results vary by operator, location and congestion.
What information is needed for DLT-compliant OTP messages?
Businesses should confirm applicable DLT principal entity, sender header and content-template requirements for their message category. Templates and consent requirements depend on use case; check with the provider before launch.
How do I prevent OTP abuse?
Set OTP expiry, retry limits, resend cooldowns, per-number and per-IP throttling, and alerting for unusual request spikes. Never put API credentials in client-side code.
Can I test integration before production?
Use the API documentation to confirm request fields, authentication, responses and delivery callbacks. Test invalid numbers, expiration, retries and error responses before any production rollout.
Is NizoraSMS a reliable OTP SMS gateway for continuous OTP delivery?
A reliable OTP service needs monitoring, approved routing, delivery-status checks and carefully controlled retries. Availability and delivery times depend on the plan, telecom operators and route conditions; no fixed delivery time or uninterrupted availability is promised here.
Can startups test OTP SMS without their own DLT registration?
For eligible standard OTP use cases, an approved template and sender identity operated by NizoraSMS or its associated entity may be available after onboarding and route approval. This is not DLT bypass. The visible sender name and permitted wording depend on the approved template and route. For your own sender name or custom content, confirm the applicable DLT registrations.
How do I compare OTP SMS API pricing for my app?
Check the current wallet or prepaid plans, SMS units, GST, permitted DLT templates, message encoding and delivery-status access. Start with a controlled test before increasing volume.
What does an OTP SMS API cost in India?
Compare the current per-message or wallet plans, minimum purchase, applicable GST, delivery status and any support or route restrictions. Use the live NizoraSMS pricing section for current plan terms rather than relying on an older fixed price.
Can my app use a provider-approved OTP template?
An eligible startup may be assigned a permitted provider-operated OTP template after onboarding. The displayed sender identity is the approved NizoraSMS or associated-operator header, not a custom startup brand. Confirm exact content and route before sending.
Does a 24/7 OTP SMS gateway guarantee delivery?
A continuously available integration should include monitoring, retry limits, support escalation and delivery-status handling. Carrier traffic, DLT approvals and outages affect handset delivery; confirm your account support terms and do not rely on a universal delivery-time guarantee.
OTP SMS integration checklist
Generate and verify OTP codes on your server, store only protected code digests where practical, set an expiry, use per-number/IP request limits, never expose API keys in the browser and test failed deliveries. Review DLT header and content template requirements before launch.