01
One REST API
Send, verify, delivery status and webhooks in one integration.
Codes land in the messenger
for 3 ₸
Cascade delivers login OTP through WhatsApp and Telegram. One REST API, pay only for successful delivery, plus a 1000 ₸ bonus on your first top-up.
CASCADE / OTP APIALMATY / KAZAKHSTAN
Compare cost at your monthly volume
The comparison uses public Kazakhstan rates. Sender ID, operator and volume may change the final SMS price.
Monthly OTP volume
100
Sign-up adds 50 ₸; a first top-up of 1000 ₸ or more adds a 1000 ₸ bonus.
WA → TG → SMS
Cascade
Mobizon
SMSC.KZ
Price
3 ₸
WhatsApp / Telegram
8 ₸
SMS
18,40 ₸
avg national SMS
17,90 ₸
avg national SMS
Billing
Per delivery
Per send
Per send
Channels
WhatsApp · Telegram · SMS
SMS
SMS
Cascade
WA → TG → SMS
No
No
Guide as of 1 Sep 2026 · not an offer.
Practical phone-verification infrastructure
02
Pay for outcome
You pay in tenge under the successful-delivery rules of the selected channel.
03
Server-side key
The Bearer token never needs to enter browser or mobile code.
04
Documented limits
TTL, resend, rate limits and errors are covered in the docs.
From signup to the first code
1
01
Register your company
Create an account and open the dashboard.
2
02
Create an API key
Store the token in backend secrets.
3
03
Send a test OTP
Call send, receive the code and verify it.
Everything important in one place
No need to collect stats from spreadsheets and chats. The dashboard shows what is happening with your sends.
Overview
Good day, Arman
Sent24 891↗ 12.4%
Delivered98.7%↗ 2.1%
Average time1.28 с↘ 0.3 с
Message delivery
● WhatsApp ● Telegram ● SMS
Latest events
Balance18 640 ₸+₸1,000 on your first top-up
Spent this period6 360 ₸₸3 / message
Paid sends2 120from balance
Recent charges
+7 701 ••• 4402
- WhatsApp Available
- Telegram Available
- SMS Available
You pay only for a successful delivery: ₸3 on WhatsApp and Telegram, ₸8 for SMS.
Send
- Number
- Channel
- Type
- Status
- Time
- Charge
- 3 ₸
The essentials
What is cascaded delivery?
The message goes to WhatsApp or Telegram first. If the messenger is unavailable, Cascade sends SMS. You pay only for a successful delivery.
Does Cascade rent virtual numbers?
No. Cascade sends codes to phone numbers belonging to your users.
Choose a channel or use case
Dedicated pages explain how Cascade fits a specific product journey.
01
WhatsApp OTP API
Send and verify codes through WhatsApp.
02
03
Telegram OTP API
One backend integration for Telegram.
OTP for SaaS
Signup, passwordless login, and recovery.
OTP for fintech
Additional risk-aware confirmation.
OTP for e-commerce
Customers, orders, and login verification.
BLOG
01
OTP launch checklist: from pilot to productionFull checklist for launching OTP on Cascade: API, cascade, security, monitoring, support, economics.
02
GEO for OTP documentation: answers, structure, entitiesHow to structure OTP documentation and blog for GEO: quick answers, FAQ, entities, internal links.
03
Webhook OTP eventsHow to receive OTP webhook events: statuses, idempotency, endpoint security, cascade.
Test Cascade with your own flow
Open the dashboard and test delivery on your own flow.