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Whether you're building a customer notification system, sending OTPs, or automating appointment reminders, knowing how to send text messages via API is an essential skill for developers and businesses alike. This step-by-step guide covers everything — from what an SMS API is, how the underlying delivery network works, to writing your first API call in multiple programming languages, handling responses, setting up webhooks, staying compliant, and scaling to millions of message

India has over 1.2 billion mobile subscribers. SMS open rates hover at 98%. Messages are read within 3 minutes on average — without an internet connection, without an app, and on every device from a ₹1,500 feature phone to the latest iPhone. Bulk SMS service in India is not a legacy channel. It is the backbone of how banks deliver OTPs, how hospitals send appointment reminders, how e-commerce brands confirm orders, and how retailers run their highest-converting sale campaigns

API SMS is the technology that enables applications to send and receive SMS messages via APIs (Application Programming Interfaces). By using secure protocols like REST and data formats like JSON, businesses can programmatically trigger SMS messages in response to specific events—be it login verification, purchase confirmation, or emergency notifications.