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CPaaS — Programmable Communication APIs
Verify / OTP & 2FA API
NobleStack's Verify API makes user authentication fast, reliable, and secure. Deliver one-time passwords and two-factor authentication across SMS, voice, and WhatsApp with a single integration — complete with automatic channel fallback so a legitimate user is never locked out.
One integration, complete verification
Instead of stitching together separate SMS, voice, and messaging systems, the Verify API handles the entire OTP lifecycle — code generation, delivery, retries, and validation — behind one endpoint. If an SMS is delayed, it automatically falls back to a voice call or WhatsApp message, keeping your conversion high and your users happy.
Capabilities
- OTP delivery across SMS, voice call, and WhatsApp
- Automatic channel fallback for maximum deliverability
- Server-side code generation, validation, and expiry management
- Configurable code length, format, and retry logic
- Rate limiting and fraud controls to block abuse
- Multi-language and regional-language OTP templates
- Real-time verification analytics and success-rate reporting
- Simple REST API and SDKs for rapid, secure integration
Why it matters
- Protect accounts and transactions from unauthorised access
- Reduce fraud and fake sign-ups with reliable phone verification
- Improve conversion with fast delivery and smart fallback
- Offload compliance and delivery complexity to NobleStack
Common scenarios
- Login and sign-up verification for apps and portals
- Transaction and payment confirmation for fintech and e-commerce
- Password resets and sensitive-action approvals
- Account-recovery and identity re-verification flows