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Telegram Bot API

What is Telegram Bot API?

The Telegram Bot API is a programmatic interface that allows developers to create bots on Telegram that can send and receive messages, including OTP codes, without human intervention.

The Telegram Bot API is an HTTP-based interface provided by Telegram that lets developers build automated accounts (bots) capable of sending and receiving messages. Developers register a bot through Telegram’s BotFather, receive an API token, and use the sendMessage endpoint to push text — including OTP codes — to users who have interacted with the bot at least once. The API is free to use, with no per-message charges, which makes it attractive for startups building verification flows on a limited budget. However, the Bot API has important limitations for business use: it provides no delivery receipt (only server-side acceptance confirmation), offers no SLA, and does not generate compliance logs. These gaps mean the Bot API works well for internal tools and early-stage products but typically requires augmentation with a dedicated OTP provider — using cascade routing through SMS or WhatsApp — once the business scales past a few hundred daily verifications.

For more on this, see BSG's One Communication API for SMS, WhatsApp, Viber & RCS — Why It Beats Five.