Send SMS that actually get delivered.
India's enterprise-grade SMS gateway with 2-sec OTP delivery, DLT compliance built-in, and transparent pay-as-you-go pricing. No contracts. No setup fees.
OnlineSMSService at a glance
OnlineSMSService is a DLT-compliant bulk SMS and OTP gateway for Indian businesses, based in Coimbatore, Tamil Nadu. Last updated:
| OTP SMS price | ₹0.10 per SMS (domestic India) |
|---|---|
| Transactional SMS price | ₹0.12 per SMS |
| Promotional SMS price | ₹0.15 per SMS; volume discounts of 10–30% from 10,000 SMS/month |
| Setup fee / contract | No setup fee, no minimum contract, billed in INR |
| Free trial | 500 free test SMS |
| OTP delivery time | Typically 2–6 seconds on priority OTP routes |
| DLT registration | Hands-on help with entity, sender header and template approval (DLT guide) |
| Integration | REST API with PHP, Python, Node.js and Java examples; SMPP 3.4; delivery-report webhooks (API docs) |
| Reseller programme | White-label SMS panel for agencies and resellers (details) |
| Contact | Phone / WhatsApp +91-95851-60363 · info@avancezone.com · Sulur, Coimbatore 641402 |
Everything you need to communicate at scale
From one-time OTPs to mass marketing campaigns — one API, one dashboard, every use case covered.
Bulk SMS
Reach millions with a single API call. Intelligent routing, real-time DLR, and time-zone aware scheduling.
Explore Bulk SMSTransactional SMS
Priority-routed alerts, order updates, and account notifications. Delivered on all DND numbers, 24×7.
Explore TransactionalOTP Service
Sub-3-second one-time passwords with auto-retry, hash verification, and multi-channel fallback (SMS → Voice → WhatsApp).
Explore OTPPromotional SMS
TRAI-compliant promotional campaigns with audience segmentation, A/B testing, and click-to-action short URLs.
Explore PromotionalSMS API
RESTful API with SDKs for PHP, Python, Node.js, and Java. Webhooks, delivery callbacks, and sandbox testing.
View API DocsWhatsApp Business
Official WhatsApp Business API. Rich media templates, interactive buttons, and catalog messages for commerce.
Explore WhatsAppBuilt for businesses that can't afford dropped messages
We don't just forward SMS. We run our own carrier-grade infrastructure across multiple telecom operators — so your messages get through, every time.
Learn about usDirect Operator Connectivity
No third-party aggregators. We maintain direct SMPP connections with Airtel, Jio, Vi, and BSNL for the lowest latency and highest throughput.
DLT Registration Done For You
We handle your entire DLT registration — entity, sender ID, and template approvals — so you can start sending within 24 hours.
Real-Time Analytics Dashboard
Track delivery rates, operator-wise breakdowns, and campaign performance in real-time. Export reports in CSV, PDF, or via webhook.
Intelligent Failover Routing
If one route fails, your message automatically re-routes through backup operators within milliseconds. Zero manual intervention.
Pay What You Use
No monthly minimums, no expiry on credits. Your unused balance carries forward forever. Volume discounts kick in automatically.
Ship SMS in 5 minutes, not 5 days
Simple, RESTful API. No WSDL nightmares. No XML configs. Just a clean HTTP POST and your message is on its way.
- REST API with JSON request/response
- SDKs for PHP, Python, Node.js, and Java
- Delivery webhooks in real-time
- Sandbox environment for testing
- Comprehensive API documentation
Ready to start sending?
Get 500 free SMS credits upon successful registration and DLT mapping with an approved telemarketer. Set up in under 5 minutes.