Documentation
Build with Zend.
Everything you need to send SMS, WhatsApp, voice, and email through one typed API — with delivery tracking, templates, and automatic fallback built in.
Send an SMS
From API key to a delivered SMS in seconds.
Send WhatsApp
Templates, interactive buttons, and media over the Cloud API.
Make a voice call
Text-to-speech calls with OTPs read digit-by-digit.
Send an email
HTML and plain text, delivered on IPs the ISPs trust.
Explore the docs
Beyond the quickstarts, the documentation is organized into four areas. Get started covers the basics; Channels goes deep on each way to send; Products covers OTP, templates, and bulk messaging; and Guides collects the integration how-tos.
Get started
Introduction and platform features — the fastest path to your first message.
Channels
SMS, WhatsApp, voice, and email — send through any channel with automatic fallback.
Products
OTP verification, templates, and bulk messaging built on top of the channels.
Guides
WhatsApp fallback and settings, plus the integration how-tos.