Viber and SMS campaigns for business worldwide. Join us

OTP - one-time passcodes
Trusted by more than 5,000 businesses

OTP -One-Time Passcodes

Deliver verification codes in seconds, to any country, over any channel.

OTP MacBookOTP Phone

Channels for the job

SMS delivery

Instant delivery to any mobile number worldwide. The default choice for verification codes, notifications, order confirmations and reminders.

SMS

RCS delivery

The new messaging format that combines the reach of SMS with messenger-grade features: verified sender, rich media, buttons and analytics

RCS

Viber delivery

A cost-effective fallback channel with branded sender identity. Add your logo, links and buttons, and track delivery in real time.

Viber

What you get

Our platform is built to make your communications as flexible, reliable and efficient as possible. Use modern tools that integrate into your stack in hours, not weeks.

Analytics

Transparent analytics

Get full visibility into every campaign: delivered and undelivered counts, link clicks, delivery timing and user activity, broken down by destination.

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Automation

Automation and scheduled sending

Build flows that run on their own: welcome messages, reminders, confirmations and promotions.

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OTP policy and
usage rules

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    An OTP is only sent in response to a user action (for example a sign-in, registration or transaction).

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    Explicit user consent to process their phone number is required.

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    The passcode must be short-lived — time-limited and valid for a single use.

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    The message must not contain advertising or marketing content of any kind.

Answer: No. OTP messages may only be sent with the user's explicit consent to process their phone number.

Yes. OTP messages can be delivered to most countries worldwide through our direct operator connections. Check coverage and rates for your specific destinations with our team.

Answer: Yes, we recommend logging every OTP send for auditing, troubleshooting and analytics.

Answer: Yes. Viber and Flash-call can both carry OTP traffic, provided they meet your security requirements and the user has given consent.

Integration case study

A driver training provider connected our API to its CRM and automated class reminders and confirmations.

Results:

+35% class attendance rate
-20% manager time spent on manual follow-up.
See Other Case Studies
Integration Case MacBook

OTP pricing

Volume
Rate per OTP
Up to 10,000
On request
Up to 100,000
On request
100,000+
Custom
Get A Quote

Message templates

Ready-to-use copy for SMS and Viber campaigns that you can send today. Each one is written to lift open rates, click-through and conversion.

More templates on the blog

Get 20% off your next 3 rides! Your promo code is winter2067. Valid until 31.10.2025

10:52

Hi Anna. We're expecting you tomorrow at 12:00 for your appointment with Maria. See you soon!

10:52

Thank you for choosing us. 150 bonus points have been added to your account. Spend them this month!

10:52

Your verification code is 4821. It expires in 5 minutes. Never share this code with anyone.

10:52

Useful information and frequent questions

SMS remains one of the most effective communication channels for business. High open rates, near-instant delivery and universal device support make it a natural fit for both marketing campaigns and transactional messages. Keep customers informed about promotions, order updates and reminders, or deliver one-time passcodes (OTP) securely.

Modern messaging platforms let you automate sending, segment your audience, personalise every message and track detailed analytics. Whatever the size of your company or the market you operate in, SMS helps you maintain effective customer communication and build lasting loyalty.

Learn more →

Question: How do I launch a campaign?

Answer: Open your account, choose "New campaign", enter your message text, upload your contacts and hit "Send".

Question: How many characters are allowed in one SMS?

Answer: Up to 160 Latin characters, or up to 70 characters when non-Latin alphabets are used.

Question: What affects the price of an SMS?

Answer: Price depends on the destination country and your monthly volume. The more messages you send, the lower the unit rate.

Question: Are there discounts for large volumes?

Answer: Yes. Customers sending 100,000+ messages a month get custom rates. Contact our team for an individual quote for your destinations.

Question: How do I top up my balance?

Answer: You can top up from your account in several ways: credit or debit card, electronic payment systems, or bank transfer.

Question: How fast are SMS delivered?

Answer: SMS are delivered within seconds of sending. Typical delivery time is 2-5 seconds.

Question: What analytics will I get?

Answer: Detailed reporting: sent, delivered and undelivered counts, delivery timing, and per-recipient status for every campaign.

Question: How do I import contacts?

Answer: You can upload contacts from an Excel or CSV file, or enter them manually in the "Contacts" section.

Question: Can I create contact groups?

Answer: Yes, you can create an unlimited number of groups to segment your audience.

Question: Which countries can I send to?

Answer: Yes, we deliver SMS to more than 200 countries worldwide with flexible per-destination pricing.

Question: How much do international SMS cost?

Answer: Rates depend on the destination country. You can review them in your account or contact our team for a quote.

Question: Is there an API for integration?

Answer: Yes, we provide a full-featured API for integration with your CRM, CMS or any other system.

Question: Which platforms are supported?

Answer: We integrate with major CRM and e-commerce platforms, plus HTTP API, SMPP and webhooks. See the "Integrations" section for the full list.