API FOR SMS MESSAGING

Simple, secure SMS API for global reach

Need a reliable SMS API? With Sinch Conversation API, you can easily send send secure, reliable, and compliant SMS messages worldwide. 

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Join over 150,000 businesses, including 8 of the 10 largest tech companies in the world.

WHAT SETS SINCH SMS APART 

The trusted SMS messaging API for every essential workflow

Sinch SMS API combines a global carrier network with AI-driven threat prevention and managed compliance. You can count on fast, dependable delivery, reduce risk, and get worldwide coverage for alerts, codes, and commands. 

Deliver with confidence 

Direct-to-carrier routing and SLA-backed uptime deliver time-sensitive alerts and codes quickly, every time. 

Communicate securely 

Built-in AI blocks smishing and artificially inflated traffic to protect your customers, your budget, and your brand. 

Reach everyone, everywhere

SMS works on every device, bridging connectivity gaps and staying reliable when other channels fail. 
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RELIABLE DELIVERY 

Expand reach and operational certainty with a bulk messaging API 

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—even when conditions change. 

  • Enterprise-grade SLA and high availability 

  • Prioritized routing for rapid OTP delivery 

  • Real-time delivery intelligence for audit-ready data 

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PROACTIVE SECURITY 

Protect customers and budgets from SMS fraud with secure, AI-protected APIs

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 

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AGILE INNOVATION 

Launch fast and easily with a developer-friendly SMS API 

A 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 

INNOVATIVE FEATURES 

Everything you need to launch, manage, and scale 
SMS messaging

WAP Push 

Send short URLs and clickable links through WAP-Push to direct mobile users in an instant. 

Delivery Reporting 

Track each SMS delivery easily with detailed status updates and error codes. 

Traffic Controls 

Easily manage the flow and performance of callback traffic with rate planning and scalable webhook infrastructure. 

Developer Tools 

Access essential tools and documentation for developers working with Conversation API. 

Message Optimization 

Craft clear, concise, and personal SMS messages to boost engagement and response rates. 

Contact Workflows 

Manage the entire customer journey from the first message to the final reply in a single flow. 

Two-Way SMS 

Have a simple back-and-forth with customers via text with two-way SMS, so you can send and receive replies seamlessly. 

Message Formatting 

Send messages in plain text, markdown, or rich content features for every channel. 

Message Timing 

Schedule messages for the perfect moment to reach your audience when they’re most responsive. 

Testing Sandbox 

Test your integration in a safe environment before going live with real traffic. 

PROVEN USE CASES 

Engage, secure, and support at scale with a trusted SMS gateway

Marketing campaigns 

Reach customers instantly with open rates up to 98%. SMS promotions drive action, build engagement, 
and boost ROI. 

Customer updates 

Keep customers informed with dependable delivery. Cut down on “Where is my order?” calls and build trust with timely notifications. 

Identity and verification 

Instantly send one-time passcodes through low-latency routes, preventing drop-offs and blocking fraudulent verification attempts. 

Customer service 

Empower agents to follow up or broadcast service alerts with two-way SMS, reducing repetitive calls and improving satisfaction. 

Frequently asked questions about Sinch SMS API 

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. 

Yes. Send large-scale SMS campaigns worldwide with real-time delivery tracking and built-in compliance management. 

AI models monitor traffic patterns to detect and block smishing and artificially inflated traffic in real time, protecting both your budget and your customers. 

Yes. Sinch SMS API is GDPR compliant and ISO 27001 certified, with built-in tools for opt-in management and regional data-privacy requirements. 

You can expect high platform availability of >99.95%, backed by our enterprise-grade SLA. 

SMS gets open rates of up to 98%, consistently outperforming email for speed and engagement. 

Just sign up for a Sinch account, get your API credentials, and start building with our unified API and developer resources. 

Power your product with an enterprise-grade SMS API

Whether you need to send alerts, OTPs, or large-scale campaigns, our team will help you launch secure, reliable SMS with global reach.