Use case

One-time passcode (OTP) verification by SMS and voice

Get verification codes to users in seconds, with fallback channels when a network struggles.

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  • 98%+delivery rate
  • Up to 40%lower cost than traditional SMS
  • 24/7support

98%+ is ZafeConnect’s reported delivery rate, not a guarantee of delivery.

In brief

One-time passcode (OTP) verification: messaging in brief

Fast, reliable delivery of verification codes. ZafeConnect provides A2P SMS, Voice API and Numbers Lookup for this, connects to 190+ countries through direct operator connections, complemented by partner direct routes, and charges only for delivered messages.

What matters most
Speed, High deliverability, Abuse protection, The right assurance level
Products that fit
A2P SMS, Voice API, Numbers Lookup, SenderID, Analytics
Network
190+ countries; direct operator connections, complemented by partner direct routes
Integration
REST API or existing systems; live in as little as 2 weeks
Pricing model
Pay per delivered message. No setup, system or operating fees and no subscription.
Delivery
A message delivery rate of over 98% (reported; not a delivery guarantee or SLA)

What matters

What matters most

One-time passcodes confirm that a user controls a phone number: at sign-up, at login, and before sensitive actions. They only work if they arrive within seconds.

Speed

A code that arrives late is a lost user.

High deliverability

Failed codes mean support tickets and abandoned sign-ups.

Abuse protection

Verification endpoints attract fraud such as artificially inflated traffic, so use rate limits and monitoring.

The right assurance level

SMS suits many cases, but high-risk actions may need stronger methods.

How ZafeConnect helps

How ZafeConnect helps

ZafeConnect delivers codes through A2P SMS and can add voice as a fallback, with failover routing and analytics so you can see delivery performance.

Failover routing

Messages route around network issues through alternative routes or regions.

Voice fallback

Deliver the code by a spoken call if text fails.

Number lookup

Validate numbers up front to cut failed sends.

Analytics

See delivery performance so you can react quickly.

  1. 1

    Request

    A user asks for a code in your app or website.

  2. 2

    Send

    Your system sends the code through the ZafeConnect API.

  3. 3

    Verify

    The user enters the code and your system confirms it.

Recommended products

Products that fit

Core messaging

A2P SMS

Reliable, cost-effective application-to-person text messages worldwide.

Learn more Voice & numbers

Voice API

Programmatic voice calls and automated voice messages.

Learn more Voice & numbers

Numbers Lookup

Validate phone numbers and check whether they can be reached.

Learn more Voice & numbers

SenderID

Let customers see who is writing before they open the message.

Learn more Platform & automation

Analytics

Cross-channel tracking and reporting at no additional cost.

Learn more

FAQ

Frequently asked questions

How fast are codes delivered?

Delivery speed depends on the destination network. ZafeConnect uses failover routing and reports a delivery rate of over 98%. Talk to us about your target countries.

What is SMS pumping?

Also called artificially inflated traffic: attackers trigger large numbers of verification messages to numbers they profit from. Rate limiting, number validation and monitoring reduce the risk.

Should we use SMS or an authenticator app?

SMS is convenient and familiar, while app- or hardware-based methods are generally considered stronger. Many companies offer both and choose based on risk.

Availability, features and requirements vary by country, operator and channel provider. Talk to us to confirm what applies to you.

  • 98%+message delivery rate
  • Up to 40%lower cost than traditional SMS
  • No hidden feesyou pay only for delivered messages
  • 2 weeksto go live – as little as
  • 24/7customer support

98%+ is ZafeConnect’s reported delivery rate, not a guarantee of delivery.