India's #1 Bulk SMS WhatsApp Business API — Sub-Second OTP Gateway Built for Indian Cities
Engineered for high-volume Indian engineering teams and product leaders: direct telecom SMPP pipes, automated TRAI DLT Scrubbing, and Meta Cloud API integration with 99.98% uptime SLA.
Full-Stack Enterprise CPaaS Solutions
Complete multi-channel engagement stack tailored for Indian enterprises, startups & developers.
DLT-Compliant Bulk SMS
Deliver promotional, transactional, and service-implicit SMS with zero queuing. Complete support for TRAI DLT headers, PE-TM binding, and real-time delivery callbacks.
WhatsApp Business API
Automate customer support, click-to-WhatsApp ads, OTP delivery, order tracking, and broadcast campaigns with rich interactive buttons and payment links.
RCS Business Messaging
Replace plain SMS with high-converting rich cards, carousels, action buttons, verified blue badges, and zero-app interactive catalogs directly inside Android Messages.
Voice API & Automated Call OTP
Never lose a sign-up. When SMS OTPs face network delays in Tier 2/3 cities, Tekhook automatically triggers instant Voice OTP calls in regional accents.
Flash OTP Gateway
Ultra-low latency dual-path routing engine built specifically for Indian banking apps, UPI signups, quick-commerce checkouts, and gaming platforms.
How DLT registration works — and where we help
Telecom operators approve DLT registrations, not Tekhook. We prepare your documents, review templates and bind the telemarketer chain so approval goes smoothly.
1. Entity registration
Register your Entity ID on the operator DLT portal(s). We help you prepare the GST, PAN and authorisation documents.
2. Header & template approval
Approve your Sender Header and content templates under the right DLT category. We review every template before you submit.
3. PE–TM chain binding
Bind Tekhook as your telemarketer so dispatch is authorised on Jio, Airtel, Vi and BSNL.
4. Go live
Add your Entity ID and Template IDs to your Tekhook account and send your first message.
New to DLT? We assist with registration at no extra cost.
Need DLT Entity & Header Registration in India?
New to TRAI DLT? Our dedicated compliance team helps register your Entity ID on Jio, Airtel, Vi, and BSNL portals, claim brand headers, and approve templates in under 4 hours.
Included Free for Indian Businesses:
- Free Entity ID Validation
- PE-TM Chain Binding
- Dynamic Variable Pre-Checker
- 10,000 Free Test Credits
Tekhook for every Indian industry
Tailored messaging workflows, compliance templates and growth playbooks for 10+ sectors — from Mumbai fintechs to Kota coaching hubs.
Messages that arrive. Prices you can see.
We publish our rates, bill on delivered messages, and handle DLT registration with you — so you know what you pay and what you get.
DLT handled with you
We help prepare your Entity ID, headers and templates on the operator portals, and bind the telemarketer chain.
Transparent INR pricing
Published per-message rates and a calculator so you can estimate cost before you talk to us. No hidden platform fees.
Fallback across channels
When an SMS does not deliver, retry over WhatsApp or Voice so time-sensitive OTPs and alerts reach your users.
How onboarding works
We onboard every client manually — there is no self-serve sign-up. Here is the path from first message to going live.
Tell us what you need
Send an enquiry with your use case, expected volume and city. We review it and reach out to talk through the right channels for you.
We help with DLT registration
Our compliance team helps you prepare your Entity ID, Sender Headers and content templates on the operator DLT portals, and binds the telemarketer chain.
Set up your account & API
Once your DLT registration is approved by the operators, we configure your account and share API credentials so you can integrate and test.
Send & track
Dispatch SMS, WhatsApp, RCS or Voice OTPs and review delivery receipts, campaign reports and audit logs. We onboard every client manually — there is no self-serve sign-up.
Indian brands work with Tekhook
"The Tekhook team walked us through DLT registration on all four operator portals and got our OTP flow integrated quickly. Their fallback routing gave us confidence during signup spikes."
Priya Nair
VP Engineering • NeoFin Payments
FinTech • Mumbai
"We moved COD confirmations to Voice OTP and added a WhatsApp cart-recovery flow. The team helped us stay DLT-compliant and the per-message pricing is transparent."
Rohan Mehta
Head of Growth • ShopVeda D2C
E-Commerce • Bengaluru
"A multi-step SMS and WhatsApp reminder journey helped us reduce missed appointments, and vernacular Tamil messaging reaches our Tier 2 and 3 patients well."
Dr. Karthik R.
Chief Digital Officer • Apex Hospitals
Healthcare • Chennai
Built for Indian enterprises
Fast OTP delivery
Dual-path routing across operators with automatic WhatsApp and Voice fallback, so time-sensitive OTPs reach your users even when one network is slow.
DLT done with you
We help with Entity ID, Sender Header and template registration on the operator DLT portals, and bind the PE-TM chain. Operators approve registrations; we make the process smooth.
Pan-India & vernacular
Routing across Jio, Airtel, Vi and BSNL, with Unicode SMS and WhatsApp templates in Indian languages for Tier 2 and Tier 3 audiences.
Smart fallback engine
When SMS fails to deliver, Tekhook can auto-retry over WhatsApp, then Voice — so critical OTPs and alerts are not lost to a single network.
Developer-friendly APIs
REST API with webhooks and real-time delivery receipts (DLR). Integrate with copy-paste samples and test before you go live.
Delivery analytics
Per-message delivery receipts, campaign reports and audit logs so you can see what delivered, what failed, and why.
Unified omnichannel engagement
Trigger the right message on the right channel — SMS, WhatsApp, RCS, Voice, Email or Push — from a single Tekhook API call with fallback routing.
Bulk SMS
Promo & transactional
WhatsApp API
Cloud API access
RCS messaging
Rich cards & carousels
Voice OTP & IVR
Multi-lingual calls
Transactional email
Inbox-optimised SMTP
Push notifications
Android, iOS & web
Integrate with a clean REST API and webhooks
Send SMS, OTP, WhatsApp and Voice from one API with real-time delivery receipts (DLR). Test in the sandbox, then go live once your DLT registration is approved. Ask us about available SDKs and integrations for your stack.
REST + Webhooks
Versioned API with sandbox
API keys
Scoped tokens & rotation
Real-time DLR
Delivery callbacks per message
Bulk import
CSV / API contact sync
const tekhook = require('tekhook')(
process.env.TEKHOOK_API_KEY
);
await tekhook.otp.send({
channel: 'auto', // SMS -> WA -> Voice
sender_id: 'TEKHOK',
dlt_template_id: '17071612345678',
recipient: '+919876543210',
otp: '9482',
validity: 300, // 5 mins
fallback: ['whatsapp','voice']
});Illustrative sample. Sender ID and template ID must be your own DLT-approved values.
Built around TRAI DLT and Indian data rules
Tekhook is built to work within India's regulatory framework — TRAI DLT for commercial messaging, and the Digital Personal Data Protection (DPDP) Act for personal data. We help you stay on the right side of consent, DND and template rules. Ask us about our specific certifications and security controls for your procurement review.
Compliance help included
- Help with DLT Entity ID & header registration
- Template review before you submit
- PE-TM chain binding on the operators
- Consent and DND guidance for promotional messaging
- A specialist to talk you through each step
From Kashmir to Kanyakumari — in Indian languages
Routing across Jio, Airtel, Vi and BSNL, while Unicode SMS and WhatsApp templates support Hindi, Tamil, Telugu, Bengali, Marathi, Kannada, Malayalam, Gujarati, Punjabi, Urdu, Odia and Assamese.
Vernacular messaging
Send OTPs and campaigns in your customer's native script with full Unicode support — helping engagement in Tier 2 and Tier 3 markets.
28 states · 8 UTs
Direct operator integrations with Jio, Airtel, Vi and BSNL for last-mile delivery, including BSNL coverage in rural pincodes.
Indian support team
A support team you can reach in English, Hindi and regional languages. Reach out and we will get back to you — ask us about response times for your plan.
Tekhook vs generic SMS providers
| Capability | Tekhook | Generic providers |
|---|---|---|
| TRAI DLT registration help | ||
| SMS to WhatsApp to Voice fallback | ||
| Indian-language Unicode SMS | ||
| Published INR pricing | ||
| Bill on delivered messages | ||
| Manual onboarding with a specialist | ||
| WhatsApp Business API access | ||
| RCS, Voice and Email from one API |