API FOR SMS MESSAGING
Need a reliable SMS API? With Sinch Conversation API, you can easily send secure, reliable, and compliant SMS messages worldwide.
Why Sinch
Sinch SMS API combines a global carrier network with AI-driven threat prevention and managed compliance. You can count on fast, dependable SMS delivery worldwide with reduced risk for alerts, codes, and commands.
“These messages need to be delivered fast. If they don’t go through, you get angry Swifties…and you don’t want angry Swifties. Our platform provides the interface. Sinch provides the messaging backbone.“
RELIABLE DELIVERY
Enjoy universal coverage, high availability, and consistent performance. With 600+ direct carrier connections, your campaigns perform better, your systems stay resilient, and your business stays connected.
Enterprise-grade SLA and high availability
Prioritized routing for rapid OTP delivery
Real-time delivery intelligence for audit-ready data
SECURITY & Fraud prevention
Our integrated AI security proactively identifies and blocks smishing, bot traffic, and unauthorized device commands to minimize risk and protect your customers and budget.
Real-time smishing and AIT detection
Filters mixed traffic types (A2P, P2P)
Preserves data integrity for accurate analytics
Launch fast
Our unified platform and managed compliance simplify integration, letting your team move from idea to implementation quickly – without regulatory headaches.
One API for global SMS messaging
Expert-backed compliance and governance
Shared templates and routing for faster rollout
Agent Tools for building with Sinch APIs, including MCP, Skills, a CLI, SDKs, Functions, and editor plugins
All SMS features
USE CASES
“We needed an efficient and cost-effective SMS infrastructure provider. Sinch checked all of the boxes with its simple set up, knowledgeable support team, and affordability.“
An SMS API is a programmable interface that allows applications to send and receive SMS messages. Sinch SMS API connects directly to 600+ carriers, delivering reliable, global delivery with built-in AI security.
Sinch’s direct carrier connections bypass unreliable routes for faster delivery and prioritized messages, all backed by enterprise-grade SLAs.
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.
You’ll get trial credit, a default project, and a Sinch test number, so you can send a test message right away. From the same dashboard you can register your 10DLC brand and campaign for US traffic and connect WhatsApp through Embedded Signup.
Yes. Send large-scale SMS campaigns worldwide with real-time delivery tracking and built-in compliance management.
Yes. Sinch SMS API is GDPR compliant and ISO 27001 certified, with built-in tools for opt-in management and regional data-privacy requirements.
SMS gets open rates of up to 98%, consistently outperforming email for speed and engagement.
AI models monitor traffic patterns to detect and block smishing and artificially inflated traffic in real time, protecting both your budget and your customers.
