Adaptive multi-channel 2FA

Verify every session with human-first security

Segundo Factor is a second factor layer that adapts to your users, not the other way around. Deliver seamless, phishing-resistant verification across SMS, WhatsApp, Telegram, and email with a single integration.

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Trusted by fintech, healthcare, and SaaS leaders.

How Segundo Factor keeps access safe

From the first login signal to the validated session, every interaction is orchestrated for trust without adding friction.

A user signs in on your website or mobile app.
Your platform shares the authentication request with Segundo Factor (mobile number and/or email).
Segundo Factor sends a secure link with a unique <token> via SMS, WhatsApp, Telegram, or email.
We confirm the validation and return the response to your application.

Sign-in moment User authenticates with your service

Trigger: Primary login succeeds on web or mobile, and your backend pings our Challenge API with the session details.

Risk-aware routing Segundo Factor receives the challenge

Signals: Device and behavior cues are scored instantly, and we auto-pick SMS, WhatsApp, email, or voice.

Customer choice User verifies through their preferred channel

Experience: Branded templates flex across every channel, and Token: links and OTPs follow your expiration window.

Real-time clearance Validation passed back to your platform

Webhooks: Signed callbacks confirm success or trigger failsafes, and Records: sessions unlock with a searchable audit trail.

Built to outperform legacy 2FA vendors

Competitive intelligence from top authentication providers distilled into a single platform. Reduce fraud, increase conversion, and give customers the modern experience they expect.

99.97% delivery rate

Intelligent channel routing

Automatically select the optimal channel based on location, carrier reliability, and user preferences to maximize completion rates.

30% fewer drop-offs

Frictionless verification UX

One-tap confirmation links and responsive templates eliminate manual code entry and reduce churn at checkout or login.

Global compliance

Enterprise-grade governance

Data residency controls, granular audit logs, and adaptive risk scoring help you meet industry and regulatory obligations worldwide.

Integrate in days, not months

SDKs and APIs inspired by developer-loved vendors mean your team can move fast without compromising security.

Unified API: send one request, reach every channel.
Pre-built widgets: drop-in verification UI for web and mobile.
Enterprise SLA: proactive monitoring with 24/7 on-call experts.

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{
  "endpoint": "https://api.segundofactor.io/v1/challenge",
  "client_id": "live_0a9x-client",
  "channels": ["sms", "whatsapp", "email"],
  "recipient": {
    "phone": "+1-202-555-0174",
    "email": "olivia@acme.co"
  },
  "metadata": {
    "session_id": "0f44d5c1-7fdc",
    "redirect_url": "https://app.acme.co/login/verified"
  }
}