Why use Telegram OTP
Telegram OTP can fit products whose users already work with Telegram and accept service messages there. The same channel can support signup, login, recovery, and confirmation of a specific action.
Cascade handles code creation, Telegram delivery, five-minute expiration, server-side verification, API responses, and operation history in the company dashboard.
This is outbound delivery to your own users. Cascade does not rent temporary numbers or receive third-party verification codes.
Product use cases
| Product | Example |
|---|---|
| SaaS | Login, employee invitation, or recovery |
| E-commerce | Customer or important order-change confirmation |
| Fintech | Additional confirmation based on transaction risk |
| CRM | Customer or employee phone verification |
| Mobile app | Phone-based signup and login |
| Internal tool | Confirmation of an administrative action |
OTP does not replace a complete security model. Add session validation, limits, anti-fraud controls, and another factor where risk requires it.
One API integration
Telegram uses the common Cascade endpoint with an explicit channel:
curl -X POST "https://cascade.kz/api/otp/send" \
-H "Authorization: Bearer $CASCADE_API_TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"phone":"77001234567","purpose":"signup","channel":"telegram"}'
After the user enters a code, the backend calls:
curl -X POST "https://cascade.kz/api/otp/verify" \
-H "Authorization: Bearer $CASCADE_API_TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"phone":"77001234567","code":"482910","purpose":"signup"}'
Phone and purpose must match the send request. Complete the user action only after success: true.
Pricing and pilot metrics
Successful Telegram delivery costs 3 credits with no subscription fee. A new account receives 1000 starting credits for integration testing.
Measure successful delivery, time to code entry, verification success, resend volume, unavailable-channel errors, and credits per verified user. Request volume alone does not show business value; completed signup or login does.
Telegram and WhatsApp together
Both channels have the same Cascade cost and use one backend integration. Enable them according to company settings and audience availability.
Do not claim that one messenger always performs better. Pilot both with your own users and compare delivery, verification, and resend data. See the full channel comparison.
Limitations
- Telegram must be accessible to the recipient.
- An external channel can delay or fail a message.
- The Bearer token belongs on the server only.
- Send and verify require independent rate limits.
- Resend needs a cooldown.
- The public SMS provider is not live, so SMS fallback must not be promised.
Launch a pilot
Create an account, store the API key in backend secrets, and test with consented numbers. Before real traffic, verify success, invalid code, expiration, resend, and UI handling for 422 and 429.