The best public APIs for Communication

Postali API

Connecting Your Apps To Your Customers Everywhere

Revolt API

Chat for humans, not bots.

Telegram Bot API

The Bot API allows you to easily create programs that use Telegram messages for an interface.

Twitter API

What's happening?

Walltime API

Efficiently Sync Your Web Service Apps and Data

Webex API

Powerful tools for developers building with Webex