Frequently asked questions about Cascade

Cascade is an API and dashboard for outbound OTP delivery to your user’s phone via WhatsApp and Telegram. It is not virtual-number rental.

Cascade lets you set the order in which OTP codes go through the available messengers. If the primary channel is unavailable, the system can use the next configured channel. Charges follow the terms of the channel that delivered the code.

No. Cascade sends the code to your user’s number and does not rent disposable phones.

WhatsApp and Telegram cost 3 ₸ per successful delivery. Packs lower the average unit price.

No. You only pay for purchased balance and successful deliveries at the channel rate.

WhatsApp and Telegram are available. The channel order and the cascade between them are set for each API key in the cabinet.

Create a company account, generate a Bearer key in the cabinet, and call https://cascade.kz/api from your backend only. Setup usually takes about 3 minutes.

Send delivers a one-time code to the user’s phone. Verify checks the code entered by the user and returns the result to your system.

Balance is charged under the successful-delivery rules of the selected channel, not merely for an attempt to send.

Only on the server: in a secret store or environment variables. Never put the key in a browser or mobile app.

The default TTL for a six-digit code is 5 minutes. Resend rules and rate limits are covered in the docs.

Check delivery status in the cabinet or via API, confirm the number is in international format and the channel is available, then resend within cooldown rules.

Buy a pack or top up from 100 units in the cabinet. Sign-up adds 50 ₸, and a first top-up of 1000 ₸ or more adds a 1000 ₸ bonus.

It is OTP-first: delivery to WhatsApp and Telegram, a cascade between messengers, verify API, webhooks and pay-per-successful-delivery.

Docs live at /docs, the endpoint reference at /api, and the schema at /openapi.yaml.