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Verification api

Step up security, keep engagements flowing

Enhance app security with scalable multi-factor authentication solutions built with conversion in mind - all available through a single API!

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

Why Sinch

We don't make you choose between security and conversions

When security meets UX

Goodbye fraudsters! Reduce unauthorized payments and account takeovers seamlessly with the most widespread and globally recognized user ID.

100% hassle-free

Make sign-up, log-in, and password resets a breeze with OTPs, password-free phone number verification, and smooth one-factor authentication.

Global reach

Verify users on any device or platform, in multiple languages, and with efficient fallback for optimal conversion, delivery, and price.

Complete verification solutions

Pick your verification method

Flash call verification

The faster, more cost-efficient alternative to traditional SMS verification.
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SMS Verification

Secure login and sign-up, reduce churn and boost revenue with the power of text.
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Data Verification

Instant verification with proven security – everything you need for a smooth UX.
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Phone Call Verification

Global call verification for mobile and landline numbers - Verify any user, anywhere!
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“More than 99% of our verification calls are successful with Sinch Flash Call Verification. I would highly recommend Sinch to any company with massive telecommunication needs.“
99%
successful verification calls
100%
digital service
Vincent Lefeuvre COO, Yespark
Read the customer story

Effortless integration with your favorite Customer Identity and Access Management platforms

Streamline identity and access management with seamless integrations:

  • Okta: Enhance security workflows with scalable, enterprise-grade solutions.

  • Auth0: Streamline user authentication with flexible, global capabilities

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The Sinch advantage

Sinch has the largest global tier-1 network with 600+ direct operator connections and an unmatched range of OTT channels, trusted by more than 3,000 enterprise customers worldwide!

We ensure end-to-end security and data protection – we are GDPR compliant, MEF Code of Conduct approved, and ISO27001 certified.

Our platform is robust, secure, fast, and designed to handle high traffic. Enjoy maximum security and quality, low latency, and access to unique telecommunications data. 

Get the exact solution you need with our wide range of SIM-based identity verification methods and our state-of-the-art capability portfolio.

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Get deeper insights into verification solutions

Frequently asked questions

You can always contact us to get started or use one of our builder-friendly options. Sign up to Sinch Build for free trial credit, and add OTP, silent auth, and number lookup under the same Access Key as the rest of your stack. 

Or, if you already code with an AI assistant, use Sinch Agent Tools to connect tools like Cursor, Claude Code, and VS Code straight to Sinch APIs.

Sinch has a suite of Agent Tools for Coding that work with any MCP-compatible or SKILL.md-compatible tool, including Claude Code, Cursor, Gemini CLI, GitHub Copilot, Codex, and Windsurf.

You'll find ready-made plugins in the VS Code Marketplace, JetBrains Marketplace, Open VSX Registry, and Cursor Marketplace, plus the sinch-plugins GitHub repo for Claude Code and Gemini CLI. 

Explore Sinch Agent Tools