EVERY MESSAGE, EVERY CHANNEL 

Omnichannel messaging API

Make life simpler by bringing together your channel management, templates, and webhooks. With Sinch Conversation API, you can send and receive across SMS, WhatsApp, Instagram, Facebook Messenger, RCS, and more via a single REST integration.  

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WHY IT MATTERS 

Cut time, cost, and risk from multichannel messaging 

Build richer conversations through one unified experience. Sinch Conversation API works as your omnichannel messaging API, so you can integrate once, expand to new channels quickly, and future-proof your messaging stack. 

Speed up time-to-market

Launch new channels in days, not months, after your first integration. A single Conversation API integration lets you deliver faster across every channel without additional builds. 

Reduce complexity & cost 

Write once and send everywhere to streamline development and ongoing work, while unified tooling makes less work for engineers. 

Future-proof your business

Add emerging channels without starting from scratch. Flexible channel management keeps your stack ready for change.

FASTER LAUNCHES 

Launch new channels in days, not months 

Once you set up the Conversation API, adding a channel is as simple as a configuration update instead of a brand-new development project. The omnichannel messaging API approach—powered by Sinch Conversation API—keeps your roadmap moving. 

  • No more months of coding for every new channel 

  • Add WhatsApp, RCS, and more with one change 

  • Keep work moving at developer speed 

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LOWER COSTS 

Drastically cut development and ongoing costs 

Juggling separate APIs slows you down. A unified API approach—delivered through Sinch Conversation API—lets you write once, send everywhere, and reinvest time and budget where it matters. 

  • Remove duplicate code bases 

  • Manage one integration, not ten 

  • Free engineers to focus on innovation 

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FUTURE-PROOF YOUR STACK 

Explore new ideas without heavy investment 

Easily adopt new and emerging channels without re-architecting, so your team can try new things without worrying. The omnichannel messaging API model through the Sinch Conversation API makes it easy to experiment, learn, and iterate quickly. 

  • Test new apps with minimal effort 

  • Stay consistent across every touchpoint 

  • Protect your stack from rapid channel changes 

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REAL-WORLD USES 

Power every customer conversation 

Conversational Commerce  

Keep customers engaged with rich product carousels on RCS and drive sales through WhatsApp—all through Sinch Conversation API. 

Customer Support  

Sinch Conversation API lets you manage support conversations across every channel for consistent, fast help. 

Omnichannel Notifications  

Send alerts to a user’s preferred channel with automatic fallback to SMS to make sure messages have the best chance at delivery. 

Marketing Campaigns  

Build a single campaign and send it across multiple messaging apps to grow your reach and consistency. 

WHAT’S INSIDE 

Powerful capabilities 

One API for 10+ channels  

Connect with customers on SMS, MMS, WhatsApp, Instagram, Facebook Messenger, RCS, and more with a single request. 

Smart Channeling  

Automatic fallback from rich channels like WhatsApp to SMS keeps messages flowing when a message can’t get through. 

Unified Webhooks  

Get every inbound message and status update through a single callback to make event handling easier. 

Template Management  

Create and manage templates for channels like WhatsApp in one place to keep your brand consistent. When requirements change, it’s easy to make updates. 

Contact Management  

Create and manage contacts to use across every channel without repeats. 

True Channel Abstraction  

A single API call structure for all channels makes development easier than what most competitors can offer. 

Multiple channels 

The Conversation API supports 10+ channels, giving you some of the most options in the industry. 

Frequently asked questions 

An omnichannel messaging API lets you build once and engage customers across SMS, WhatsApp, Instagram, Facebook Messenger, RCS, and more through a single integration. 

Both support many channels, but an omnichannel messaging API has unified management—shared templates, webhooks, and fallback—so you avoid separate code paths. 

Yes. Common features are streamlined, and when you need advanced functionality, you can pass through channel-specific capabilities. 

Simply set a prioritized channel order in your API call. If WhatsApp fails, the API will automatically try SMS or your next choice. 

To get started, you’ll need an application or system to integrate with the Conversation API, plus development resources: 

1. Create your project and app in the Sinch dashboard to get your credentials 
2. Send a message using a single API request 
3. Get all the responses in one unified webhook 

Through the Sinch Conversation API, it supports 10+ channels including WhatsApp, SMS, MMS, RCS, Instagram, Facebook Messenger, Viber, and more. 

Pricing is pay-as-you-go. 

It’s ISO 27001 certified and includes AI models to detect and block fraudulent traffic like Artificially Inflated Traffic (AIT). The platform helps you manage GDPR, TCPA, and other compliance needs with consent tools and secure data handling. 

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Discover how easy it is to build once with our omnichannel messaging API and reach SMS, WhatsApp, Instagram, and more.