Sinch

Overview

Sinch offers a developer-focused platform providing APIs for integrating communication capabilities into applications. Since its founding in 2008, the company has expanded its offerings to cover various aspects of digital communication, from basic messaging to advanced engagement tools. The core product line includes APIs for SMS, Voice, WhatsApp Business, MMS, and a unified Conversations API, designed to facilitate global messaging solutions and customer interaction. Developers can utilize Sinch to implement two-factor authentication (2FA) via SMS or voice, enable in-app chat features, or build comprehensive customer engagement platforms.

The platform is engineered to support scalability and global reach, addressing use cases that require reliable message delivery and voice communication across different regions. For instance, the SMS API allows sending and receiving text messages globally, while the Verify API provides tools for user authentication and phone number verification. This supports businesses in securing accounts and reducing fraud through robust identity confirmation processes. Sinch’s approach to communication infrastructure aims to simplify the complexities of global telecommunications for developers, offering consistent interfaces across various channels.

Sinch targets a broad audience, including enterprises seeking to enhance their customer service, startups building new communication-centric applications, and any organization requiring programmatic access to global messaging and voice services. The platform emphasizes compliance with industry standards, holding certifications like SOC 2 Type II, ISO 27001, GDPR, and HIPAA, which are relevant for businesses operating in regulated sectors or handling sensitive user data. This focus on security and compliance is critical for applications that process personal information or manage financial transactions. Developers are provided with comprehensive documentation and SDKs in multiple languages, including Java, Node.js, Python, and Ruby, to aid integration efforts. The developer portal includes quickstarts and guides to assist with implementing communication features effectively, such as sending an SMS or initiating a voice call programmatically. The flexibility in programming language support allows development teams to integrate Sinch APIs into existing technology stacks with minimal friction.

Key features

• SMS API: Enables sending and receiving text messages globally, supporting bulk messaging, delivery receipts, and two-way communication. This includes capabilities for long codes, short codes, and alphanumeric sender IDs.
• Voice API: Provides programmatic control over voice calls, allowing for features like text-to-speech, call routing, conferencing, and interactive voice response (IVR) systems. It supports global voice termination and origination.
• Verify API: Offers robust two-factor authentication (2FA) and phone number verification services using various methods, including SMS, flash calls, and data verification, to secure user accounts and prevent fraud. This is crucial for onboarding processes and sensitive transactions.
• WhatsApp Business API: Facilitates customer engagement through the WhatsApp Business Platform, enabling businesses to send notifications, provide customer support, and manage conversations with users on WhatsApp. Integration allows for rich media and interactive messages.
• MMS API: Supports sending and receiving multimedia messages (MMS) containing images, audio, and video content, enhancing engagement over traditional SMS.
• Conversations API: A unified API for managing customer interactions across multiple channels, including SMS, WhatsApp, and potentially other future messaging platforms, providing a consistent interface for multi-channel communication strategies.
• Global Reach: Infrastructure designed for worldwide message delivery and voice connectivity, supporting applications with an international user base.
• Developer SDKs: Available SDKs for popular languages such as Java, Node.js, Python, Ruby, PHP, and .NET to simplify API integration and development workflows.

Pricing

Sinch operates on a pay-as-you-go pricing model with volume discounts available for higher usage. A free tier is offered, providing free credits to help developers get started and test the services. Specific rates vary by service (e.g., SMS, Voice, Verify) and destination country. For detailed and up-to-date pricing information, developers should consult the official Sinch pricing page.

As of 2026-06-07, the pricing structure is subject to change. Always refer to the official Sinch pricing documentation for the most current information.

Common integrations

• CRM Platforms: Integrate SMS and Voice APIs into CRM systems like Salesforce to enable direct communication with customers from within the CRM interface for support, marketing, and sales automation. Salesforce CRM solutions often benefit from direct messaging APIs.
• Customer Support Platforms: Connect Sinch APIs with helpdesk software to provide real-time communication channels, such as in-app chat or SMS support, augmenting traditional email and phone support. Freshworks offers customer support tools that can integrate with communication APIs.
• E-commerce Platforms: Implement transactional SMS for order confirmations, shipping updates, and delivery notifications, or use verification APIs for secure customer logins and payment authentications.
• Identity & Access Management (IAM) Systems: Utilize the Verify API for multi-factor authentication (MFA) to bolster security for user accounts, complementing existing IAM solutions.
• Marketing Automation Tools: Incorporate SMS into marketing campaigns for promotions, alerts, and personalized messages to engage customers directly on their mobile devices.
• Healthcare Applications: Leverage HIPAA-compliant messaging for appointment reminders, secure patient communications, and telehealth services, ensuring privacy and regulatory adherence.

Alternatives

• Twilio: A cloud communications platform offering APIs for voice, SMS, video, and authentication, known for its extensive developer ecosystem and global reach.
• Vonage: Provides a suite of communication APIs, including voice, SMS, video, and unified communications solutions, often used for contact center and business communication needs.
• MessageBird: Offers an omnichannel communication platform with APIs for SMS, voice, WhatsApp, and more, focusing on global reach and customer engagement.

Getting started

To begin using Sinch, developers typically sign up for an account, which often includes free credits for testing. The next step involves obtaining API credentials, usually an API key and secret, from the Sinch developer dashboard. The comprehensive Sinch documentation provides quickstart guides for various services. Below is a basic example using cURL to send an SMS message, illustrating the direct interaction with the Sinch SMS API:

curl -X POST "https://sms.api.sinch.com/xms/v1/{servicePlanId}/batches"
     -H "Content-Type: application/json"
     -H "Authorization: Bearer {your_bearer_token}"
     -d '{
       "from": "+12025550100",
       "to": [
         "+12025550101"
       ],
       "body": "Hello from Sinch!"
     }'

This cURL example demonstrates sending a simple text message. Developers would replace {servicePlanId} with their specific service plan ID and {your_bearer_token} with an authenticated OAuth 2.0 token obtained through the Sinch authentication process. The from and to fields contain the sender and recipient phone numbers, respectively. For more advanced implementations and to integrate into specific applications, Sinch provides API reference documentation and SDKs for Java, Node.js, Python, and other languages, facilitating direct integration into diverse development environments.