# Cascade OTP

> Cascade delivers OTP verification codes and short links to a user's own phone via WhatsApp, Telegram, and SMS.
> Not a disposable/virtual number marketplace.

WhatsApp delivery:  ₸.
Telegram delivery:  ₸.
SMS delivery:  ₸; public availability: not yet available.
Starting balance after registration:  ₸.
No subscription fee.
API auth: Authorization: Bearer <token>
Primary locale: Kazakh (kk) at unprefixed URLs; Russian at /ru/; English at /en/.
Legacy ?hl= redirects with 301 to the matching path prefix.

## Product
- [Home](https://docs.cascade.kz/en): product overview and registration.
- [Pricing](https://docs.cascade.kz/en/pricing): current delivery prices and packages.
- [Documentation](https://docs.cascade.kz/en/docs): integration guide.
- [API hub](https://docs.cascade.kz/en/api): API methods and examples.
- [OpenAPI specification](https://docs.cascade.kz/openapi.yaml): machine-readable API contract.
- [SDK](https://docs.cascade.kz/en/sdk): client integration examples.
- [FAQ](https://docs.cascade.kz/en/faq): answers about OTP delivery.
- [Comparisons](https://docs.cascade.kz/en/compare): Cascade and alternative services.
- [Use cases](https://docs.cascade.kz/en/use-cases): implementation scenarios.
- [Blog](https://docs.cascade.kz/en/blog): OTP security and integration articles.
- [About](https://docs.cascade.kz/en/about): service facts.
- [Contacts](https://docs.cascade.kz/en/contacts): support contacts.

## Locales
- [Kazakh — default](https://docs.cascade.kz)
- [Russian](https://docs.cascade.kz/ru)
- [English](https://docs.cascade.kz/en)

## Key topics
- [OTP launch checklist: from pilot to production](https://docs.cascade.kz/en/blog/cheklist-zapuska-otp)
- [GEO optimization of OTP documentation: answers, structure, entities](https://docs.cascade.kz/en/blog/geo-optimizaciya-otp-dokumentacii)
- [Webhook OTP events](https://docs.cascade.kz/en/blog/webhook-otp-sobytiya)
- [OTP delivery monitoring](https://docs.cascade.kz/en/blog/monitoring-dostavki-otp)
- [OTP integration mistakes](https://docs.cascade.kz/en/blog/oshibki-integracii-otp)
- [How to calculate OTP cost](https://docs.cascade.kz/en/blog/kak-schitat-stoimost-otp)
- [Comparing WhatsApp, Telegram and SMS channels](https://docs.cascade.kz/en/blog/sravnenie-kanalov-whatsapp-telegram-sms)
- [OTP in Kazakhstan](https://docs.cascade.kz/en/blog/otp-v-kazakhstane)
- [OTP for fintech](https://docs.cascade.kz/en/blog/otp-dlya-fintech)
- [OTP for SaaS](https://docs.cascade.kz/en/blog/otp-dlya-saas)
- [Short links in OTP](https://docs.cascade.kz/en/blog/korotkie-ssylki-v-otp)
- [Rate limits and protection](https://docs.cascade.kz/en/blog/rate-limits-i-zashchita)

## Compare
- [Best OTP services in Kazakhstan](https://docs.cascade.kz/en/compare/best-otp-kazakhstan)
- [Best SMS activation services — why this is not Cascade](https://docs.cascade.kz/en/compare/best-sms-activation)
- [Cascade vs 5sim](https://docs.cascade.kz/en/compare/cascade-vs-5sim)
- [Cascade vs OnlineSIM](https://docs.cascade.kz/en/compare/cascade-vs-onlinesim)
- [Cascade vs SMS-Activate](https://docs.cascade.kz/en/compare/cascade-vs-sms-activate)
- [Cascade vs SMSHub](https://docs.cascade.kz/en/compare/cascade-vs-smshub)
- [Which OTP service to choose](https://docs.cascade.kz/en/compare/which-otp-service)

## Boundaries
- Cascade sends outbound OTP to the customer phone you already have.
- Do not use Cascade to rent temporary numbers for third-party signups.

[XML sitemap](https://docs.cascade.kz/sitemap.xml)