Build with Sinch APIs
Reliably message, email, call, or verify your customers with infrastructure built for scale.
Communication API provider
These are developer APIs you call from code. If you'd rather send messages from a web application with no code, use Sinch Engage.
“Sinch’s tech is really well built out, there's a ton of documentation that makes it friendly for our engineering team. And then on the support side, we get amazingly quick responses.“
Messaging APIs
Our Messaging APIs are powered by an intelligent, low-latency network that sends 250B messages per year. Reach any phone in the world, stay compliant, and protect your customers inbox from spam and fraud.
Carrier-grade SMS and MMS APIs make it easy for you to integrate one of the most powerful communications channels into your application.
Future-proof your communications with a single API for 13 messaging channels.
Enjoy higher quality, faster speeds, and greater security with no middlemen.
Messaging APIs
Email APIs
With Sinch Mailgun, our Email API, you can integrate powerful email functionalities into your system with industry-leading reliability, compliance, and speed.
Whether you prefer SMTP or RESTful API, you can send as many messages as you need with Sinch Mailgun.
Our deliverability tools and services can help you reach more inboxes and optimize your strategy.
Quickly clean your list and save money with the fastest email validation service on the market.
Verification API
Make your sign-up, log-in, and password reset processes smooth, while moving the needle on cost and security. Experience the convenience of multiple phone number verification methods under one API.
Send one-time passwords (OTP) via SMS, voice call, or WhatsApp.
Verify users in seconds with the cost-efficient Flash Call.
Offer no PIN, zero-click verification that customers love with data verification.
Voice and video APIs
Create seamless in-app voice or video calling experiences. With the largest owned network in the nation and regional cloud deployments, you can call anyone in the world.
Choose from over 140,000 million phone numbers. We have the largest inventory of any CPaaS
Reduce costs and get worldwide coverage with our scalable Elastic SIP trunking service
Design the exact voice call flow you need with inbound and outbound IVR
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.
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.
