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Verification api

Step up security, keep engagements flowing

Confirm a phone number belongs to your user at signup, login, or checkout, without losing real customers to clunky codes. One API handles it, and it works alongside the identity and fraud tools you already use.

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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

No. The Verification API only sends one-time codes and verification calls. For promotional or customer messages, use the Conversation API. 

A free Sinch Build account and your application key and application secret. You'll find both in the dashboard as soon as you sign up, along with trial credit.

Signup for a free Sinch Build account

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.

Learn about the Sinch Build Dashboard

Sinch APIs work with 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. 

Signup for a free Sinch Build account
The Sinch developer blog has step-by-step builds, release notes, and agentic guides. For API reference and quickstarts, go to developers.sinch.com.