HTTP SMS API - Integrate Bulk SMS Into Your Application in Minutes
Powerful, reliable Bulk SMS API that connects your software to our global messaging network. Send promotional campaigns, transactional alerts, and OTP messages through simple HTTP requests.
Whether you're building a CRM, e-commerce platform, or mobile app, our HTTP API makes SMS integration straightforward. No complex SDKs required—just make HTTP calls and start sending messages to customers worldwide.
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What is Techto Networks HTTP API?
The Techto Networks HTTP API is a RESTful web service that allows developers to programmatically send SMS messages directly from their applications, websites, or software systems. Instead of logging into a web portal to send messages manually, you can integrate our SMS capabilities into your existing workflows using simple HTTP requests.
Why businesses choose our API:
Our API is built for developers who need reliability without complexity. You get direct access to our Tier-1 carrier connections, meaning your messages reach recipients faster with higher delivery rates. Whether you're sending one message or one million, our infrastructure scales automatically to handle your volume.
Who uses this API?
E-commerce businesses use it for order confirmations and shipping updates. SaaS companies integrate it for user authentication through OTP messages. Marketing teams automate campaign delivery. Educational institutions send exam alerts. Healthcare providers dispatch appointment reminders. If your business communicates with customers, our API makes it seamless.
Why Developers Love Our HTTP API
Simple Integration, Powerful Results
You don't need to be an SMS expert to get started. Our API uses standard HTTP protocols that work with any programming language—PHP, Python, Java, Node.js, Ruby, .NET, or even simple cURL commands. If your application can make web requests, it can send SMS messages through our platform.
Multiple Route Options for Every Use Case
Not all messages are created equal, and our API recognizes that. Send promotional campaigns during business hours, trigger instant transactional alerts 24/7, dispatch time-sensitive OTP codes, or reach international audiences. Each route is optimized for its specific purpose with appropriate delivery priorities and regulations built in.
Real-Time Delivery Tracking
Every message you send receives a unique identifier. Use this to track delivery status, retrieve reports, and build comprehensive analytics into your application. Know exactly when your message was delivered, if it failed, and why—so you can take appropriate action.
DLT Compliance Built In
Navigating India's DLT (Distributed Ledger Technology) requirements can be complex. Our API handles template ID validation automatically, ensuring your messages comply with TRAI regulations. You focus on your business logic; we handle the regulatory complexity.
Credit Monitoring Made Easy
Never run out of credits unexpectedly. Our API includes endpoints to check your available balance for each route programmatically. Build automated alerts into your application that notify you when credits run low, or integrate with your billing systems for automatic top-ups.
Comprehensive Error Handling
Our API provides specific error codes that tell you exactly what went wrong—invalid sender ID, low credits, DND numbers, or spam detection. This lets you build intelligent retry logic and provide meaningful feedback to your users instead of generic failure messages.
GETTING STARTED with http api
01
Generate Your API Token: Secure your account and generate a unique token for API access.
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Compose Your Message:
URL-encode special characters. Use the appropriate route and message type (Text, Flash, Unicode)..
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Track Delivery:
​Use the Delivery Report API and Available Credits API to monitor performance. Provide sample JSON responses for better understanding.
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Configure Your Sender ID:
Set up the sender ID that will appear on recipients' devices.
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04
Send Your First SMS:
Provide a sample API request with placeholders (like token, number, route, etc.). Explain how to handle errors using the provided error codes.
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06
Manage Credits:
Buy required credits on the panel so that you can continue to submit messages.
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Ready-to-Use Code Examples
Real-World Applications of Our SMS API
ORDER MANAGEMENT IN E COMMERCE
Online stores integrate our API to automatically send order confirmations, shipping notifications, and delivery alerts. When a customer completes a purchase, your system triggers an instant SMS with order details. As the package moves through fulfillment stages, your logistics system sends status updates. Customers stay informed without you lifting a finger.
API Integration Best Practices
Always URL Encode Your Message Content
Special characters, spaces, and symbols can break API requests if not properly encoded. Most programming languages have built-in URL encoding functions—use them. This prevents mysterious failures when your message contains punctuation or customer names with special characters.
Implement Retry Logic with Exponential Backoff
Network hiccups happen. When you receive error code 111 (connection error) or 109 (no SMSC), don't give up immediately. Wait a few seconds and retry. Implement exponential backoff—wait 2 seconds, then 4, then 8—up to a reasonable maximum. This handles temporary issues without hammering our servers.
Store Message IDs for Audit Trails
Every successful API call returns a message ID. Save this in your database alongside the recipient number, message content, and timestamp. This creates an audit trail for compliance, helps debug delivery issues, and lets you retrieve delivery reports later.
Monitor Your Credits Programmatically
Don't wait until messages fail with error 108 (low credits). Set up a scheduled task that checks your available credits daily using the credits API. When balance drops below a threshold, trigger alerts to your team or automatically top up your account.
Respect Promotional Route Timing
Route 1 (promotional) only works between 9 AM and 9 PM IST per TRAI regulations. If you're scheduling campaigns, build logic that queues messages sent outside these hours for delivery when the window opens. Trying to send promotional messages at midnight will always fail with error 110.
Handle DND Numbers Gracefully
When you receive error 112 (all numbers are DND), don't treat it as a system failure. Many Indian mobile users are on the Do Not Disturb registry. For promotional messages, you legally cannot reach them. Filter these numbers out or offer alternative communication channels like email.
Test with Small Batches First
Before sending to your entire customer database, test with a small batch of 5-10 numbers. Verify formatting, check delivery reports, and confirm message content displays correctly. This catches configuration issues before they impact thousands of customers.
Use Appropriate Routes for Message Types
Don't send OTP codes through the promotional route—use Trans OTP (route 4) for highest priority delivery. Don't send marketing campaigns through transactional routes—it's against regulations and can get your account flagged. Match the route to your message purpose.
Keep Your Sender IDs Consistent
Customers learn to recognize your sender ID. Use the same sender ID across all transactional messages from your business. This builds trust and improves message open rates. Register multiple sender IDs if you have distinct brands or message types.
Validate Phone Numbers Before Sending
Check that numbers are 10 digits and look valid before making API calls. Simple validation prevents error 103 and saves API calls. Remove spaces, country codes, and special characters from user input before submitting.
Security and Regulatory Compliance
DLT Compliance Built In
The Techto Networks platform is fully integrated with India's DLT (Distributed Ledger Technology) framework mandated by TRAI. Every API call validates your template ID against registered DLT templates, ensuring your messages comply with regulations before delivery. This protects your business from penalties while maintaining the integrity of India's telecommunications ecosystem.
Secure Token-Based Authentication
All API requests use token-based authentication, with tokens unique to each account. Unlike username-password systems, tokens can be rotated without changing your login credentials, and they can be restricted to API access only. Your token never expires unless you manually regenerate it, providing stable integration while maintaining security.
HTTPS Encryption
Our primary SMS sending endpoint uses HTTPS encryption to protect your message content and authentication credentials during transmission. Any data passing between your server and our API is encrypted in transit, preventing interception of sensitive information like OTP codes or customer phone numbers.
Data Privacy Standards
We don't store your message content longer than necessary for delivery and reporting purposes. Your customer phone numbers and message data remain confidential and are never shared with third parties for marketing purposes. We maintain strict data retention policies compliant with Indian data protection regulations.
Rate Limiting and Abuse Prevention
Our API includes intelligent rate limiting to prevent abuse while allowing legitimate high-volume usage. If you need to send extremely high volumes, contact our team to discuss appropriate rate limits for your use case. This protects the platform's stability and ensures fair access for all customers.
Frequently Asked Questions About Techto Networks HTTP API
How do I get started with the Techto Networks SMS API?
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Getting started takes less than 10 minutes. First, create an account on the Techto Networks platform if you haven't already. Once logged in, navigate to the API Settings section in your dashboard to generate your unique API token. Next, register and get approval for your sender IDs—this usually takes a few hours. Finally, add credits to your account for your desired route (promotional, transactional, etc.). Once you have your token, approved sender ID, and credits, you can make your first API call using any of our code examples.
Is the Techto Networks API free to use?
The API itself has no integration fees or monthly subscription costs. You only pay for the SMS messages you actually send, which are deducted from your account credits. Different routes have different per-message costs based on carrier charges and delivery priorities. You can find current pricing in your dashboard under the pricing section. There are no hidden fees, setup charges, or minimum commitments.
Which programming languages work with your SMS API?
Our HTTP API works with any programming language that can make HTTP requests—which means virtually all of them. We provide code examples for popular languages including PHP, Python, Node.js, Java, C#, Ruby, and cURL command line. Even no-code platforms like Zapier, Make (formerly Integromat), and n8n can integrate with our API through webhook actions. If your software can construct a URL and make a GET request, it can send Bulk SMS through our platform.
How quickly are messages delivered through the API?
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Delivery speed depends on the route you choose. Trans OTP messages (route 4) receive highest priority and typically deliver within 1-3 seconds. Transactional messages (routes 2 and 10) deliver within 5-10 seconds. Promotional messages (route 1) may take up to 30 seconds during peak hours since they're lower priority. International messages vary by destination country but generally deliver within 10-30 seconds.
What is a DLT template ID and why do I need it?
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DLT (Distributed Ledger Technology) is a regulatory requirement implemented by TRAI (Telecom Regulatory Authority of India) to prevent spam SMS. Before sending commercial messages in India, you must register your message templates and sender IDs with your telecom operator through the DLT portal. Each approved template receives a unique ID. When making API calls, you include this template ID, and our system verifies your message matches the registered template. This ensures compliance and protects users from unsolicited messages.
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Can I send SMS messages to international phone numbers?
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Yes, our API supports international messaging through route 9. International messages work slightly differently—you need to include the full country code with the phone number, and pricing varies by destination country. Make sure you have credits in your international route, and check with our support team for specific country availability and rates. Most major countries are supported including USA, UK, UAE, Saudi Arabia, Singapore, and Australia.
How do I handle error code 108 (low credits)?
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Error 108 means you don't have sufficient credits in the specific route you're trying to use. First, log into your dashboard and check your credit balance for that route. If low, add credits through the recharge section. To prevent this in the future, set up automated credit monitoring using our credits API endpoint. You can build logic that checks your balance daily and sends alerts when it drops below a threshold, or even automatically trigger top-ups through your billing system.
What's the difference between promotional and transactional routes?
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Promotional route (route 1) is designed for marketing messages like offers, discounts, and campaigns. It only works between 9 AM-9 PM IST per TRAI regulations and cannot reach numbers on the DND registry. Transactional route (route 2) is for service-related messages like order confirmations, OTPs, and account alerts. It works 24/7 and can reach DND numbers because they're informational rather than promotional. The key distinction: transactional messages relate to an existing relationship or transaction with the customer, while promotional messages are marketing outreach.
How many phone numbers can I send to in a single API call?
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You can send to multiple recipients in one API call by comma-separating phone numbers in the number parameter. While there's no strict limit, we recommend keeping batches under 1,000 numbers per request for optimal performance and easier error tracking. For larger campaigns, split your audience into multiple API calls. This approach also makes it easier to track delivery reports since each batch gets its own message ID.
What happens if I send the same message to the same number multiple times?
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Our system doesn't automatically prevent duplicate messages—if you make the same API call twice, both messages will be sent and charged. It's your responsibility to implement de-duplication logic in your application if needed. However, this flexibility allows legitimate use cases like sending multiple OTPs if the user requests new codes. For marketing campaigns, always maintain unsubscribe lists and de-duplicate your recipient database before making API calls.
Can I schedule messages to be sent at a future time?
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The API itself sends messages immediately upon request. For scheduled sending, implement scheduling logic in your application. Most applications use cron jobs, scheduled tasks, or queue systems that make API calls at specified times. This gives you more control over timing, timezone handling, and the ability to cancel or modify scheduled messages before they're sent.
How do I know if my message was actually delivered?
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Use the delivery report API endpoint with the message ID you received when sending. The response includes detailed status for each recipient number—delivered, failed, pending, etc., along with timestamps. Delivery reports are typically available within 30 seconds of sending, though some carriers may take longer to provide delivery confirmations. Check delivery reports programmatically to build comprehensive messaging analytics into your application.
What should I do if I keep getting error code 113 (invalid template ID)?
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Error 113 means the template ID you're providing doesn't match any approved template for your account, or your message content doesn't match the registered template. Log into your DLT portal and verify the template ID is correct. Also ensure your message content exactly matches the template, including variable placeholders. Even small differences in punctuation or spacing can cause mismatches. If you're certain everything is correct, contact our support team—there may be a sync issue between the DLT registry and our system that needs manual verification.
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Is my API token secure, and how should I protect it?
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Your API token is essentially a password that authenticates all SMS requests to your account. Never expose it in client-side code, public repositories, or anywhere users can see it. Store it as an environment variable or in secure configuration files with restricted access. If you suspect your token has been compromised, regenerate it immediately from your dashboard. All API calls should be made from your server, never directly from user browsers or mobile apps where tokens could be intercepted.
Can I use the API for sending OTP messages?
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Absolutely—OTP delivery is one of the most common use cases. Use route 4 (Trans OTP) for one-time passwords and authentication codes. This route receives highest delivery priority to ensure your users don't wait for security codes. Make sure your OTP template is registered in the DLT portal with the appropriate template ID. Most businesses combine OTP sending with the delivery report API to verify successful delivery before allowing users to proceed.
What happens if the recipient's phone is switched off or out of network coverage?
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When a phone is unreachable, carriers typically queue the message for delayed delivery, attempting redelivery for up to 24-48 hours depending on the carrier. During this time, the delivery report API will show status as "PENDING" or "SUBMITTED." If the phone remains unreachable beyond the carrier's retry period, the status updates to "FAILED." You're only charged for messages that are actually delivered, not for pending attempts.
Do you provide webhooks for delivery notifications?
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Currently, our API uses a pull model where you retrieve delivery reports using the delivery report endpoint. This gives you control over when and how often you check status. Many customers set up scheduled tasks that periodically check delivery reports for recent messages. For real-time notifications, you can implement polling with short intervals (every 30-60 seconds) for critical messages like OTPs, and longer intervals (every 5-10 minutes) for bulk campaigns.
Can I get support if I'm stuck with integration?
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Yes, our technical support team helps with API integration issues. Contact support through your dashboard with details about the error you're encountering, the programming language you're using, and sample code (with your token removed for security). We also provide comprehensive documentation, code examples in multiple languages, and this FAQ to help you self-serve common integration questions. For urgent issues affecting live production systems, priority support is available.
What's the maximum message length I can send?
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Standard text messages (type 1) support 160 characters. If you need longer messages, they're automatically split into multiple segments and billed accordingly. Unicode messages (type 3) for regional languages and emojis are limited to 70 characters per segment due to encoding requirements. Flash messages (type 2) follow the same length limits as standard text. Keep messages concise for better delivery rates and lower costs, or use URL shorteners to link to detailed information.
Can I send messages in regional Indian languages?
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Yes, use message type 3 (Unicode) to send SMS in Hindi, Tamil, Telugu, Bengali, Gujarati, Marathi, or any language that requires special characters. Unicode messages are limited to 70 characters per segment instead of the standard 160. Make sure your message content is properly UTF-8 encoded before URL-encoding it for the API request. Also register your regional language templates in the DLT portal with the correct character set.
How do I test the API without sending real messages?
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Start by sending test messages to your own phone number to verify integration before scaling to customers. Use small batches of 1-5 numbers initially. There isn't a separate sandbox environment since SMS costs are negligible and you'll want to see real delivery behavior anyway. Most developers create a test routine that sends to their mobile number, checks delivery reports, and validates the end-to-end flow before deploying to production.
What should I do if messages are being marked as spam?
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Error code 107 (spam blocked) triggers when our content filters detect potentially unwanted messaging patterns. This could happen if you're sending identical messages to many recipients too quickly, using suspicious keywords, or your sender ID isn't properly registered. Ensure your sender ID is approved, your DLT templates are correctly registered, and you're only messaging users who've opted in. If you believe you're getting false positives, contact support with examples of blocked content for review.