Bulk SMS API for Developers in India with 99.9% Uptime
Integrate transactional alerts, OTPs and promotional campaigns into your product with a clean REST API, sample code in PHP, Java, Python and .NET, webhook delivery reports and 99.9% uptime monitored round the clock.
- TRAI-DLT compliant
- 230+ operator routes
- 24x7 support
Developers choose Guru SMS as their bulk SMS API provider in India because integration takes an afternoon, not a sprint. Authenticate with a secure API key, post a JSON payload, and your application is sending DLT-compliant messages across 230+ direct operator connections. Detailed documentation, sandbox testing and ready sample code in PHP, Java, Python and .NET remove every step of guesswork.
Reliability is engineered in, not promised. The gateway maintains 99.9% uptime with automatic failover across redundant infrastructure, while a high-priority transactional route pushes OTPs and alerts at 98-99% delivery. Webhook callbacks stream delivery receipts to your server in real time, so your CRM, ERP or e-commerce backend always knows which message reached which customer and exactly when.
Scaling never needs a renegotiation. The same API that helps a startup send a few hundred order confirmations daily already powers the enterprises behind our 200M+ delivered SMS. Bulk endpoints for lakh-size batches, throttling controls, Unicode support for regional language alerts and in-panel DLT template mapping mean your engineering team ships messaging once and forgets about it.
Everything you get with SMS API
RESTful JSON API
Send single or bulk messages with simple HTTP POST calls; clear status codes and descriptive error messages make debugging painless.
Plug-and-Play Sample Code
Copy-paste snippets in PHP, Java, Python and .NET keep typical integrations under one hour from API key to first message.
99.9% Uptime
Redundant gateways with automatic failover keep your OTPs and alerts flowing even during operator-level outages and festive traffic storms.
Webhook Delivery Reports
Real-time callbacks push delivered, failed and pending statuses straight to your endpoint, eliminating polling and keeping databases in sync.
Dedicated OTP Route
A separate high-priority pipeline delivers one-time passwords in seconds at 98-99% success, isolated from promotional traffic queues.
Secure by Default
HTTPS-only endpoints, IP whitelisting and revocable API keys protect your account, while DLT scrubbing keeps every message TRAI compliant.
Bulk and Scheduled Sends
Submit lakh-size batches in a single call, schedule future delivery and personalise each message with dynamic fields per recipient.
Usage Dashboard
Monitor API traffic, credit consumption and route-wise delivery trends in a live panel your operations team can audit anytime.
Launch in four steps
Get Your API Key
Sign up, complete DLT mapping with our assistance and generate a secure key from the panel; sandbox credits let you test immediately.
Integrate With Sample Code
Drop in ready snippets for PHP, Java, Python or .NET, point them at your key and send your first test message in minutes.
Configure Webhooks
Register your callback URL to receive real-time delivery receipts, then map statuses into your CRM, database or notification workflows.
Go Live and Monitor
Switch to production credits, watch the live dashboard for throughput and delivery trends, and scale volumes without any code changes.
Why businesses choose us for sms api
Ship in Hours, Not Weeks
Clear documentation, sandbox keys and working sample code mean a single developer can take your application from zero to production messaging in one working day.
No Lost Transactions
Webhook delivery receipts confirm every OTP and alert, letting your application retry intelligently and your support team answer customer queries with exact timestamps.
One API, Every Route
Switch between transactional, promotional and OTP routes with a single parameter instead of juggling multiple vendors, separate panels and messy reconciliation reports.
Compliance Handled in Code
DLT template IDs map directly into API calls, and our team pre-validates your payloads against registered templates so messages never fail scrubbing silently.
Built for Indian Scale
Festive spikes, exam result days and flash sales generate lakhs of API calls per hour; infrastructure proven across 200M+ SMS absorbs them without queuing delays.
Developer Support That Codes
24x7 support includes engineers who read your request logs and stack traces rather than scripts; most integration issues close on the very first call.
SMS API across industries
E-commerce
Trigger order confirmations, shipping updates and COD verification OTPs from your storefront automatically, keeping buyers informed from checkout to doorstep.
Banking and Finance
Send transaction alerts, OTP authentication and EMI reminders from core banking and loan management systems over a dedicated 98-99% delivery route.
Healthcare
Connect hospital information systems to send appointment confirmations, lab report alerts and medication follow-up reminders without any manual front-desk effort.
Education
Integrate ERP and LMS platforms to push attendance alerts, fee reminders and exam results to parents the moment records are updated.
Travel
Automate PNR confirmations, schedule change alerts and boarding reminders from booking engines so travellers get updates faster than call centres.
Logistics
Fire pickup confirmations, out-for-delivery alerts and delivery OTPs from your tracking system, cutting failed delivery attempts and support calls.
Real Estate
Sync CRM lead capture with instant site visit confirmations, payment milestone alerts and possession updates across multiple ongoing projects.
Government
Power citizen service portals with application status alerts, grievance acknowledgements and scheme disbursement notifications delivered reliably at district and state scale.
Bulk SMS API across India
Local support, national delivery. Open your city page:
Popular in Odisha
FAQs — Bulk SMS API
How long does API integration take?
Most developers send their first test message within an hour using our sample code in PHP, Java, Python or .NET. A typical production integration with webhooks and error handling completes in one to two days, and our engineers assist on call throughout.
Do I need DLT registration before using the API?
Yes, TRAI mandates DLT registration for all application-originated SMS in India. Register your entity, headers and templates once, map the template IDs into your API payloads, and every message clears operator scrubbing. We provide complete DLT registration assistance to speed this up.
How do delivery report webhooks work?
Register a callback URL in the panel and our gateway posts a JSON receipt for every message, carrying status, operator, timestamp and your custom reference ID. Receipts typically arrive within seconds of handset delivery, letting your application reconcile in real time.
What uptime and delivery rates does the API offer?
The gateway maintains 99.9% uptime with automatic failover across redundant infrastructure. Transactional and OTP traffic delivers at 98-99% while promotional routes achieve 90-95%, riding 230+ direct operator connections that avoid grey-route drops entirely.
Can the API send OTP messages?
Yes. A dedicated OTP route prioritises one-time passwords ahead of all other traffic, delivering most within seconds. Use the same REST endpoint with the OTP route flag, and pair it with webhooks to trigger resend logic only when genuinely needed.
Does the API support regional language messages?
Fully. Pass Unicode content and the gateway handles Hindi, Odia, Bengali, Tamil and every Indian script with correct encoding and character counting. Multilingual transactional alerts are especially popular with clients serving tier-2 and tier-3 customers.
Is there a sandbox for testing?
Yes. Sandbox credentials let your team test request formats, webhook handling and error scenarios without consuming production credits or messaging real customers. Once flows look right, switching to production is a one-line credential change.
What support do developers get after going live?
24x7 technical support includes engineers who inspect your actual API logs, response codes and webhook traffic. Escalations reach our Bhubaneswar operations team directly by phone at +91-9853084604, and documentation is updated continuously with worked examples.
Start Building With the Guru SMS API
Get sandbox credentials, sample code and DLT guidance in one onboarding call. Email info@gurusms.in or phone +91-9853084604 and have your application sending compliant SMS this week.
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