Cascade blog
Practical guides on OTP, SMS verification, API and delivery scenarios — without fluff or invented claims.
OTP security: protect code delivery and verification
Practical OTP security: expiration, send and verify limits, server-side API-key storage, safe logs, neutral responses, resend, and monitoring.
Read →What is OTP and how does a one-time code work?
A practical explanation of OTP: sending and verifying a one-time code, expiration, security, WhatsApp and Telegram delivery, and the Cascade API flow.
How to integrate an OTP API into a website or app
A step-by-step Cascade OTP API integration: server-side Bearer token, send and verify calls, error handling, testing, and launch checklist.
OTP in Kazakhstan: WhatsApp and Telegram API
How to launch phone verification in Kazakhstan: +7 number format, WhatsApp and Telegram OTP, pricing, localization, security, and a Cascade API pilot.
OTP rate limits: protect send, verify, and resend
Limit OTP requests by phone, account, IP, and API key; handle 429 responses, use bounded backoff, and detect attacks without blocking real users.
WhatsApp, Telegram, or SMS for OTP: channel comparison
A factual comparison of WhatsApp, Telegram, and SMS for OTP delivery: Cascade availability, cost, limitations, user experience, and channel choice.