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User Authentication & Security

Stay ahead of evolving fraud with smarter, seamless security

Cyber threats are evolving, fast. Twilio helps security teams stay ahead with intelligent tools that block fraud, verify users, and protect every digital touchpoint.

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A group of colleagues smiling and working on a computer together in an office setting at night.

Keep your systems secure, flexible, and built to scale

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Verify API

Authenticate across SMS, WhatsApp, push, silent mobile signals or TOTP. Built-in fraud checks help you stay secure as you scale

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Messaging API

Protect your traffic from spam, spoofing, and SMS pumping with verified senders and pre-approved delivery routes

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Lookup API

Catch spoofed numbers, recycled lines and suspicious activity in real time so you can block fraud before they become a threat

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Trusted by security leaders protecting seamless user experiences

See how leading brands use Twilio to strengthen authentication, safeguard user identities, and enable seamless user access.

"All we had to think about was how to integrate 2FA into our customer sign-in workflow and other critical actions throughout the site. Integration was a non-issue – we implemented, and it worked."

Michael Breu Chief Compliance Officer

"Twilio Verify Fraud Guard identifies and proactively blocks patterns that match known fraudulent SMS schemes and behavioural anomalies. It not only cuts costs but also elevates our security posture."

Alvin Lim Head of Information Security

"By integrating Twilio Verify, we significantly reduced the amount of code in the most critical paths of our user journeys, like onboarding and login; allowing us to focus on other areas of development."

Jeffrey Thompson Principal Security Engineer

Endowus

96% Verify Conversion Rate Overall. 98% Verify Conversion Rate via WhatsApp. 1% false positives in SMS fraud detection with Verify FraudGuard.

Spriggy

1 week to replace existing solution and deploy Verify. 50 fraud attempts blocked every month. 89 - 90% success rates with authentication attempts.

How Verify works

Twilio Verify uses real-time carrier signals and intelligent checks to authenticate users across channels and stop fraud without slowing down trusted customers.

Here’s how it helps your team:

  • One API for all authentication methods

    OTPs, push, silent network auth, TOTP, and more. Flexible methods built to suit your risk profile

  • Intelligent threat detection

    Flags fraud signals like SMS pumping, and number spoofing before they impact your systems

  • Global coverage with local compliance

    Pre-approved templates, local regulations, and automated localisation for 200+ countries and regions

  • Built to scale and perform

    Handles billions of verifications a year with 99.999% uptime and global SLA-backed support

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Woman holding and looking at a tablet screen in a dimly lit environment.
Man wearing glasses and a dark jacket smiles while looking at smartphone on public transport.
Man wearing glasses and a dark jacket smiles while looking at smartphone on public transport.

How Messaging works

Twilio Messaging gives you a secure, reliable way to send business-critical messages at scale—backed by compliance tools, fraud protection, and intelligent routing.

Here’s how it helps your team:

  • One API for every channel

    Send alerts, updates, and support messages across SMS, WhatsApp, MMS, and more using verified senders and trusted delivery paths

  • Stop abuse before it starts

    Block SMS pumping, spoofing, and suspicious traffic with built-in safeguards and smart routing decisions

  • Visibility and control at every step

    Track delivery, spot issues, and understand message behaviour with Messaging Insights and real-time webhooks

  • Built for compliance and scale

    Built-in support for local regulations, sender registration, and infrastructure across 180+ countries

How Lookup works

Twilio Lookup gives your team real-time phone number intelligence so you can spot risk, validate users, and route traffic with confidence.

Here’s how it helps your team:

  • Check if a number is real

    Catch invalid or mistyped numbers before you send anything, so you don't waste messages, or fail verifications

  • See what kind of number it is

    Know whether it’s mobile, landline, or VoIP so you can route properly or block unsupported types

  • Catch fraud early

    Get ahead of spoofing, SMS pumping, and number recycling before they become a threat

  • All the details in one API call

    Access risk score, validity, line type, and more in one request so your systems can act fast

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Two colleagues engaged in discussion over a tablet in a modern office environment.

Security that stands up to real-world challenges

See how IT and security teams protect users, block threats, and reduce performance degradation.

Proven fraud protection, unmatched detection

Verify legitimacy in real-time and tailor your risk tolerance for layered fraud prevention without the complexity.

Powered by: Verify, Lookup

Smiling woman with glasses talking on the phone and working on a computer at her desk.
Smiling woman with glasses talking on the phone and working on a computer at her desk.

Why Twilio?

Twilio gives security and engineering teams the tools to stop fraud, protect customer touchpoints, and stay in control without sacrificing speed or experience.

Here's why teams build with us: 

Dynamic security that responds to risk

Adjust security requirements dynamically based on user risk profiles and behaviour analytics

Built-in trust, global compliance

Meet global standards with robust encryption and privacy controls

Seamless integration, rapid deployment

Flexible APIs and SDKs support rapid deployment and customisation to your security architecture

Built-in security and compliance

Stop SMS pumping, protect A2P traffic, and meet local regulations out of the box

Interested in learning more?
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