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UNIFIED MESSAGING

Build it once with Sinch’s reliable business messaging APIs

Tired of juggling vendors? Sinch’s messaging APIs let you reach customers on SMS, MMS, WhatsApp, RCS, and more – in nearly every country – with the reliability, scale, and deliverability only a global carrier network can provide (Available through the Sinch Conversation API).

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Join over 200,000 businesses, including 8 of the 10 largest tech companies in the world

WHAT MAKES IT GREAT

A future-ready partner for growth, efficiency, and compliance – powered by messaging APIs built for scale

Sinch’s messaging APIs replace multiple vendors with a single connection. Boost engagement, lower costs, and send messages across 190+ countries.

Engage and convert

Reach customers on SMS, MMS, RCS, WhatsApp, and more with personalized, interactive content that increases clicks and conversions.

Operate efficiently

Simplify your tech stack with one integration that reduces development time, optimizes routing, and helps you control spend across every channel.

Scale and comply

Send messages worldwide with 99.95% SMS uptime, consent tools, encryption, and automatic fallback to keep you compliant everywhere you grow.

HIGHER ENGAGEMENT

Build richer conversations and get higher conversion rates with messaging APIs

Combine SMS, MMS, RCS, and WhatsApp into one streamlined setup with Sinch’s Conversation API. Smart fallback ensures every message lands, while rich media and verified profiles help you stand out and boost clicks.

  • High SMS open rates keep audiences informed

  • Rich media and quick replies encourage action

  • AI-powered personalization improves response rates

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LOWER COSTS

Cut integration, routing, and fraud-related expenses

Managing multiple vendors adds time and expense. With Sinch, you can reduce maintenance and prevent overspending with Automated Channel Fallback. Plus, you’ll get real-time fraud detection that helps protect against Artificially Inflated Traffic (AIT).

  • One provider reduces overhead and upkeep

  • Smart Channeling balances reach and cost

  • Fraud monitoring instantly blocks inflated traffic

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SCALE & COMPLY

APIs for messaging help you reach the world reliably

Global messaging shouldn’t be complicated. With our 600+ direct carrier connections and 99.95% SMS uptime guarantee, Sinch delivers reliability and speed you can count on. Our messaging API features include built-in governance tools that let you control consent management and encryption so you can meet complex regional regulations, while automatic fallback keeps you covered as you scale.

  • 600+ direct carrier routes across 190+ countries

  • Consent tools, encryption, and audit trails

  • Automatic fallback keeps delivery seamless

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FEATURES THAT JUST WORK

Everything you need in one unified suite

Our transactional SMS service includes the tools teams need to deliver fast, secure, and reliable notifications.

SMS API

Send secure, reliable, and compliant SMS messages worldwide through one
programmable SMS API.
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MMS API

Send images, videos, audio, and longer text messages to customers in the US, Canada, and Australia.
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Conversation API

Replace multiple vendors with Messaging APIs to speed up launches across 13 channels.
Learn More

RCS for Business API

Engage customers with images, videos, carousels, quick replies, and verified business profiles.
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WhatsApp Business API

Bring all your customer chats together, automate messages, and build lasting trust with a verified WhatsApp account.
Learn More

WHERE IT WORKS

Sinch powers industries where downtime isn’t an option

Retail & E-commerce

Send promotions through SMS or MMS, follow up with RCS carousels or WhatsApp offers, and drive shoppers to checkout
—all while keeping costs low.

Finance & Banking

Deliver one-time passcodes, encrypted fraud alerts, and payment reminders on trusted channels with verified business profiles.

Logistics & Delivery

Confirm orders by SMS, share live tracking through RCS, and switch to WhatsApp or MMS to help reduce missed deliveries and support calls.

Healthcare

Send appointment reminders and prescription notices by SMS, follow up with RCS or WhatsApp, and let AI choose the best moment for each patient.

Frequently asked questions

Sinch Build is the developer console and control plane for all Sinch APIs - Messaging, Voice, Verification, Numbers, SIP, and Fax - under one identity, one set of credentials, and one dashboard. It sits in front of every Sinch API, handling routing, compliance, and observability so you don't have to build that infrastructure yourself.

Sinch Build is for developers. It’s the console where you get API access and build messaging, voice, and verification into your own software. Sinch Engage is a ready-to-use messaging platform for SMS, RCS, and WhatsApp. It’s for marketing, service, and operations teams who want to send without code, or by connect messaging to their CRM or ERP. 

Explore Sinch Engage

Sinch APIs work with any tool that supports MCP or SKILL.md files, including Claude Code, Cursor, Gemini CLI, GitHub Copilot, Codex, and Windsurf. Add Sinch Skills so your assistant knows how Sinch’s APIs work, and connect the Docs MCP at developers.sinch.com/mcp so it writes code from the current API reference.

Prefer a plugin? Install one from the VS Code Marketplace, JetBrains Marketplace, Open VSX Registry, or Cursor Marketplace, or use the sinch-plugins GitHub repo for Claude Code and Gemini CLI. See setup steps for each plugin.

Start by signing up for Sinch Build and grabbing your access key and credentials. You can then take those details to your AI coding tool to continue building from there. 

The Sinch developer blog has step-by-step builds, release notes, and agentic guides. For API reference and quickstarts, go to developers.sinch.com.

Working with one provider streamlines your operations, simplifies development, and helps you go to market faster. It also ensures every customer interaction feels consistent, no matter the channel.

See our customers

Sinch Messaging uses Smart Channeling with built-in fallback. If a message can’t be delivered on a rich channel, like RCS or WhatsApp, it automatically falls back to another like SMS to make sure it gets through.

Yes, you can start with a core channel and add others as your business needs change, without rebuilding your existing integration.

Sinch messaging APIs include enterprise-grade security such as encryption, consent management, regional data handling, and detailed audit trails. AI models also detect and block unusual or fraudulent traffic.

You’ll need a system like a CRM or marketing automation platform or the technical resources to connect to our Messaging APIs. Our teams can guide you on the best approach for your specific setup.