Nexmo Verify

Protect your users and your business with all-in-one, economical verification.

Telesign SMS Verify

Delivers patented phone-based verification and two-factor authentication using a time-based, one-time passcode sent over SMS

SendGrid

Welcome to SendGrid’s Web API v3! This API is RESTful, fully featured, and easy to integrate with.

Nylas Cloud

The Nylas Cloud API integrates email, calendar, and contacts into your platform . One integration connects your app with 100% of email services (IMAP, Exchange/ActiveSync, Outlook, Gmail, Yahoo, etc.), creating one unified source of data for teams to reference. Send personalized email drip campaigns at scale while reaching your customer's inbox with nearly 100% email deliverability. Track email opens, link clicks, and reply rates; or, pull team-level email data to track productivity week over week. Nylas helps hundreds of SaaS companies streamline communications, reduce context-switching from web app to email, and act on powerful email data. Start developing by connecting and syncing up to 10 accounts for free.

Slack

Build tools, bots or apps for this communication tool.

Viber

With Viber’s APIs, you can create unique experiences for users at scale.

PubNub

Apply real-time publish/subscribe messaging to your program.

Telesign Voice Verify

An API that delivers patented phone-based verification and two-factor authentication (2FA) using a one-time passcode (OTP) sent over voice message in the event the end-user chooses the voice method, provides a landline or is not authorized to receive SMS messages in a specific country.

Twilio

Enable programmable SMS, voice, video and IP Messaging.

FacebookMessenger

Send and recive messages using Facebook Messenger API.

AmazonSES

Send and receive email using your own email addresses and domains

EmailLabs

Make and send emails with this cloud-based SMTP email API.

Intercom

Access data and build integrations for this chat app.

ContextIO

Context.IO is a modern, scalable email API that brings IMAP into the 21st century.