We manually looked through thousands of SMS apis to find the best. Here is a list of the most popular and cheapest SMS APIs.

Provide customer care and deliver notifications on the world’s most popular messaging app with Twilio APIs and software.

Using the WhatsApp Business API with Twilio, you can send and receive messages to WhatsApp users using the same Twilio Messaging APIs you already know and enjoy. Dive into the Twilio SDKs and helper libraries, see our quickstart and API reference docs, read through guides on templates and Twilio phone numbers, and find the sample code you'll need.

WhatsApp Business API

The Bot API is an HTTP-based interface created for developers keen on building bots for Telegram.

This API allows you to connect bots to our system. Telegram Bots are special accounts that do not require an additional phone number to set up. These accounts serve as an interface for code running somewhere on your server.

To use this, you don't need to know anything about how our MTProto encryption protocol works — our intermediary server will handle all encryption and communication with the Telegram API for you. You communicate with this server via a simple HTTPS-interface that offers a simplified version of the Telegram API.

10 of the Best Sms Apis