Developer resources at your fingertips. Dive into Voice, Messaging, and Faxing API documentation.
Voice API
The Intelsend Voice API offers a simple and secure way to create, control, and manage voice campaigns. With our Voice API, businesses can programmatically initiate outbound calls using HTTP requests or by integrating with our Node.js SDK. Using HTTP callbacks, you can dynamically alter live calls and track call progress in real time. Inbound calls are easy to handle too — all you need is to configure a Voice API profile in our Customer Portal. Campaign flows can be customized using our XML-based format (VoXML), making it easy to add features like text-to-speech, call recordings, and interactive voice recognition. From simple notifications to complex IVR setups, Intelsend Voice API provides everything you need to deliver a quality calling experience.
Messaging API
The Intelsend Messaging API makes it easy to send and receive SMS and MMS messages at scale. Whether you’re sending transactional notifications, promotional campaigns, or enabling two-way customer interactions, our Messaging API ensures fast, reliable delivery. Designed with security and scalability in mind, Intelsend helps your business engage customers more effectively while protecting sensitive data.
Email API
The Intelsend Email API enables businesses to deliver personalized, secure, and high-volume email campaigns. From transactional emails to promotional newsletters, our API makes it simple to connect with your audience. With advanced features like templating, tracking, and robust deliverability, Intelsend ensures your messages reach the inbox every time. Easily manage lists, monitor campaign performance, and automate follow-ups — all from our API or Customer Portal.