Gro SMS: Deliver mission-critical OTPs and high-converting campaigns with sub-second latency.
Engineered by Hyberlab to solve the reliability and deliverability bottlenecks of regional messaging providers, Gro SMS provides developers and businesses with an ultra-reliable REST API, a modern self-service campaign dashboard, custom alphanumeric sender IDs, real-time delivery status (DLR) webhooks, and prepaid credit billing. Built with a high-concurrency Node.js engine and MySQL/Redis queuing, it processes tens of thousands of messages simultaneously with 99.98% delivery success rates.
The Old Way vs. The Gro SMS Way
Why legacy tools failed our requirements, and how Gro SMS solves the friction points once and for all.
The Legacy Pain Points
What businesses previously endured- Frequent carrier drops and OTP delivery delays exceeding 30–60 seconds during peak hours
- Clunky legacy portals without clean REST APIs, SDKs, or automated webhooks
- Opaque prepaid billing where clients are billed even for failed or undelivered messages
- Zero audience segmentation, forcing manual CSV formatting and carrier rejection risks
The Gro SMS Solution
Engineered by Hyberlab- Sub-2.4s transactional OTP delivery with priority queue routing over enterprise telecom routes
- Developer-first JSON REST API with interactive documentation and instant webhook telemetry
- Automated credit refund logic for any message that fails carrier delivery
- Intelligent contact segmentation with dynamic tags (VIP, Promo, Leads) and duplicate detection
Engineered for performance and reliability.
A closer look at the architecture and user experience that sets Gro SMS apart.
Transactional OTP Engine
High-priority queue routing ensures security codes and authentication tokens land in customer inboxes in under 3 seconds.
Bulk Campaign Scheduler
Upload CSVs, target segmented contact lists, personalize variables, and schedule blasts with smart throttling to prevent carrier blocks.
Multi-Tenant API Architecture
Secure API keys, granular team permissions, and real-time webhook callbacks for instant integration into ERPs, CRMs, and web apps.
Carrier-Grade Delivery Reports
Live telemetry into delivered, pending, and failed states with automated balance refunds for undeliverable numbers.
Under the hood:
production telemetry.
We architected Gro SMS with modular microservices and automated failover pipelines to guarantee strict operational SLAs.
Priority OTP Pipeline
Queue RoutingTransactional one-time passwords bypass bulk queues entirely via dedicated Redis priority queues, ensuring instantaneous delivery.
Dynamic Gateway Failover
High AvailabilityIf a primary telecom aggregator experiences carrier latency, traffic automatically shifts to backup channels in milliseconds.
Multi-Tenant Data Isolation
SecurityRow-level tenant isolation, hashed API keys, and rate limiting ensure strict security across all enterprise accounts.
Real-time DLR Ingestion
TelemetryIncoming carrier Delivery Receipts (DLR) are ingested asynchronously via high-throughput webhooks and exposed in live dashboard charts.
Honest, predictable pricing.
Zero surprise fees or hidden renewal tricks. Select the tier that matches your scale.
Starter
Ideal for early-stage apps and startups needing OTPs and basic customer alerts.
- Volume up to 1,000 SMS
- High-speed transactional OTP route
- Full REST API access
- Web dashboard & contact management
- Standard delivery reports
Medium
Designed for active eCommerce stores and growing software services.
- Volume 1,000 – 5,000 SMS
- Custom Sender ID registration
- Sub-2.4s OTP priority route
- Webhook delivery callbacks
- CSV contact list import & tags
- WhatsApp & email support
Growth
Best value for scaling businesses running regular marketing and transactional notifications.
- Volume 5,000 – 15,000 SMS
- Dedicated throughput allocation
- Automated balance refill alerts
- Custom alphanumeric sender ID
- Advanced analytics & CSV exports
- Priority 24/7 technical support
Enterprise
For high-volume retail chains, fintech apps, and telecom aggregators.
- Volume 15,000 – 25,000+ SMS
- Lowest volume rates (< Rs. 0.77 on 25k+)
- Dedicated account manager
- Custom SLA contract (99.9%)
- Custom API integrations & SDK support
- Multi-seat team workspace
Questions about
Gro SMS?
Everything you need to know about billing, integrations, and deployment.
Need a custom enterprise quote?
Talk directly with the senior engineering team behind Gro SMS.
How fast do OTP verification messages arrive?
Gro SMS routes OTPs through a dedicated priority queue separate from bulk marketing blasts. Average delivery latency to NTC and Ncell subscribers is under 2.4 seconds.
How does prepaid credit billing work?
You fund your wallet in Nepali Rupees using local payment channels. As messages are sent, your balance deducts per SMS. If a message permanently fails carrier transmission, your credits are refunded automatically.
Can I integrate Gro SMS into my own website or mobile app?
Yes. We offer an intuitive JSON REST API. You can generate API keys directly inside your dashboard and trigger SMS dispatches with a single POST request in Node.js, Python, PHP, or Go.
Do you assist with custom Sender ID registration?
Yes. For registered businesses, our team helps prepare and submit compliance documentation to Nepal Telecom and Ncell to whitelist your official brand name as the sender ID.
What happens if a contact list contains duplicate numbers?
Our system automatically deduplicates and formats telephone numbers upon CSV upload, preventing redundant message sends and saving you money.
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Start using Gro SMS today.
Visit grosms.com to create your account, or contact Hyberlab to discuss private enterprise licensing, high-volume discounts, or custom integrations.