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For a Telegram crypto-swap experience, use a bot for conversation and a Mini App for a richer interactive interface. A bot can handle entry points, commands, status messages, and support; a Mini App can present token selection, quote review, and transaction confirmation. That division is an architecture recommendation based on Telegram’s documented capabilities, not a platform requirement. The blockchain, wallet, swap protocol, and target markets determine the transaction details.
What separates a Telegram bot from a Mini App?
| Area | Bot | Mini App | What it means for a swap |
|---|---|---|---|
| Interface | Messages, commands, keyboards, and inline buttons | A custom JavaScript interface embedded in Telegram | Conversation-based tasks can stay in chat; multi-step choices and review screens fit a custom interface. |
| User input | Text, commands, predefined keyboard choices, and button presses | A flexible web interface with access to Telegram theme and viewport information | A Mini App can make asset selection, quote review, and confirmation states easier to present clearly. |
| Launch and discovery | Chat, menu, commands, and buttons | Profile main-app button, keyboard or inline button, bot menu, inline mode, direct link, or attachment menu | Choose an entry point based on the context the app needs; launch methods differ in what context and capabilities they provide. |
| Identity context | Interaction context arrives through bot updates | Launch data is available to the Mini App, but must be validated on the backend | Do not use browser-provided identity as authorization until the backend verifies it. |
| Wallet operations | Can guide users and send status messages | For TON, TON Connect documents wallet connection and transaction requests from a Mini App | Wallet integration depends on the chain; TON Connect is specifically for TON. |
Telegram describes Mini Apps as web services and documents bot commands, keyboards, and inline buttons. The practical division above follows from those interface capabilities, rather than a requirement that every swap product use both components. Telegram Mini Apps documentation · Telegram bot features
Which part should handle each step of the swap?
Use the bot for entry and conversation
- Offer a clear way to open the swap interface, such as a bot menu or button.
- Keep commands, support, and simple conversational guidance in chat.
- Send transaction-status updates through the bot where the chosen launch and messaging context supports them.
Use the Mini App for interactive review
- Present token and amount choices in a custom interface.
- Show the quote and transaction details for the user to review.
- Hand off wallet approval through a chain-appropriate integration.
This hybrid is a sensible starting point when the swap requires several choices and a review screen. A bot-only experience may be sufficient for a simpler use case; Telegram’s documentation does not mandate either design.
How do Mini App launch methods affect the flow?
Telegram documents seven launch methods: a main app from a bot profile, a keyboard button, an inline button, a bot menu button, inline mode, a direct link, and an attachment menu. These are not interchangeable. For example, an inline-button launch receives basic user information and a query ID for certain messages sent through the bot. Direct-link Mini Apps can receive chat context identifiers, but Telegram says direct-link and inline-mode Mini Apps cannot read the chat or send messages on the user’s behalf. In inline mode, the user must actively choose a result to send content. Telegram’s documentation also states an availability restriction for the attachment-menu feature. Telegram Mini Apps launch methods
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A bot profile can link to a main Mini App, and a direct link can include a startapp value. Treat that value as routing or referral context, not proof of a user’s identity or authorization to trade. Verify identity and apply the swap service’s own authorization rules on the backend.
Design for the embedded mobile view
Telegram exposes interface details including theme, viewport, fullscreen state, and safe-area insets. Its design guidance calls for responsive, mobile-first interfaces, labeled inputs and images, and respect for safe areas. For a swap review screen, make amounts, destinations, and transaction consequences legible within the embedded view.
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How should Telegram identity be authenticated?
Telegram explicitly warns that initDataUnsafe should not be trusted. Send the raw Telegram.WebApp.initData to the backend and validate its hash using Telegram’s documented HMAC-SHA-256 procedure. The data-check string is made from the received fields sorted alphabetically and joined with line feeds. The backend can also check auth_date to reject outdated launch data. Telegram’s Mini App data-validation guidance
For third-party validation, Telegram documents a signature-based method using the bot ID and a Telegram public key, and advises checking auth_date as well. This is relevant when a service receives launch data without the bot token.
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Keep identity, wallet approval, and swap execution distinct
- Telegram launch data: Establishes a Telegram identity context only after successful verification.
- Wallet connection: Provides a way to request wallet operations; it does not prove the connected address belongs to the Telegram account.
- Swap service or contract: Determines quote and execution behavior under the chosen implementation.
Do not treat a Telegram identity as proof of wallet ownership, or a connected wallet as proof of Telegram identity. This separation follows from Telegram’s identity-validation model and TON Connect’s distinct wallet-transaction role.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does TON Connect provide for a TON swap?
For a TON-based product, TON Connect is a documented option for connecting a wallet to a Telegram Mini App. TON describes it as an end-to-end encrypted session through which a decentralized application can read a connected address, request signatures, and send transactions without handling the user’s keys. TON Connect overview
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TON’s documentation links to recipes for connecting and disconnecting wallets, sending transactions, signing data, gasless transfers, embedded requests, and filtering wallets. It also says TON Connect does not provide deeper TON blockchain integrations; those must be implemented separately. It is a wallet-connection protocol, not a swap router or quote engine. These details apply to TON and should not be generalized to other blockchains.
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Distinguish in-app purchases from blockchain interactions
TON’s documentation says digital goods and services sold inside Telegram Mini Apps use Telegram Stars, while TON Connect remains available for permitted blockchain interactions under Telegram’s blockchain guidelines. This is a platform-policy distinction, not a legal determination or blanket confirmation that any particular swap product is permitted. Check the rules applicable to the specific product and markets before launch.
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What remains specific to the swap product?
The architecture comparison does not determine how a particular swap should quote or execute trades. The chain, swap protocol, wallet set, deployment model, custody model, and target jurisdictions are unspecified, and they affect the implementation. Before settling the transaction flow, define how the product will handle:
- Swap routing and quote freshness
- Slippage limits and fee presentation
- Transaction simulation and user confirmation
- Confirmation monitoring and failure or retry states
- Wallet support and jurisdictional requirements
Telegram and TON platform documentation do not constitute an audit of a swap application or a legal review. Treat these as product-specific design and compliance decisions, not capabilities supplied automatically by a bot, Mini App, or wallet-connection protocol.
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