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For a Telegram crypto-swap product, use a bot for conversation and a Mini App for the interactive swap flow. The bot can handle discovery, commands, status messages, notifications, and support; the Mini App can present token selection, quote review, and wallet handoff. This division is an architecture recommendation based on Telegram’s documented capabilities, not a platform requirement. The right transaction integration depends on the blockchain: TON Connect, for example, is a TON wallet protocol, not a universal swap system.
Bot or Mini App: which fits a swap flow?
A Telegram bot works through messages, commands, keyboards, and inline buttons. A Mini App is a custom JavaScript interface that opens within Telegram. For a swap involving several choices and a review before wallet approval, a Mini App generally gives the product more room to make amounts, destinations, and consequences clear. The bot remains useful as the messaging and control surface around that interface.
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| Area | Bot | Mini App |
|---|---|---|
| Interface | Messages, commands, keyboards, and inline buttons | Custom JavaScript interface inside Telegram |
| User input | Text, commands, predefined choices, and button presses | Flexible web interface with Telegram theme and viewport information |
| Launch and discovery | Bot chat, commands, menu, and buttons | Profile, keyboard, inline button, menu, inline mode, direct link, or attachment menu |
| Wallet role | Can guide users and send status messages; the cited Telegram platform documentation does not describe a bot-only swap transaction protocol | For TON, TON Connect documents wallet connections and transaction requests from a Mini App |
| Natural product role | Entry point, commands, updates, notifications, and support | Asset selection, quote review, and wallet handoff |
A bot-only experience may be enough for a simple, narrowly scoped interaction. For a richer swap interface, the two components can work together: the bot gets users into the flow and keeps them informed, while the Mini App handles the detailed screens.
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Telegram documents seven Mini App launch methods. The launch route matters because available context and capabilities differ; it should be chosen deliberately rather than treated as a cosmetic detail.
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- Main Mini App: linked from a bot profile; it can also be opened with a
startappparameter. - Keyboard button: launched from a bot keyboard.
- Inline button: launched from an inline button; Telegram documents basic user information and a query ID that can be used for certain messages sent via the bot.
- Bot menu button: opened from the bot’s menu.
- Inline mode: launched through inline interaction. The user must actively choose an inline result to send content.
- Direct link: can include chat-context identifiers and a
startappvalue, but cannot read the chat or send messages on the user’s behalf. - Attachment menu: another documented launch route, with availability restrictions stated in Telegram’s documentation.
Use startapp values for routing or referral context, not as proof of identity or authorization. A launch parameter can help select where the app opens, but server-side access decisions should rely on verified identity and the application’s own rules.
Telegram exposes interface details such as theme, viewport, fullscreen state, and safe-area insets. Design the Mini App for a responsive mobile view, respect safe areas, and label inputs and images. In a swap review screen, that helps keep amounts, destination details, and transaction consequences legible.
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Keep Telegram identity separate from wallet authorization
Telegram warns that Mini App data in initDataUnsafe must not be trusted. Send the raw Telegram.WebApp.initData value to your backend and validate its hash before treating the launch as an authenticated Telegram context. Telegram documents a verification method using HMAC-SHA-256: sort the received fields alphabetically, join them with line feeds to create the data-check string, and verify the hash. The backend can also check auth_date to reject outdated launch data.
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For a swap, keep three responsibilities distinct:
- Telegram launch data establishes a verified Telegram identity context.
- The wallet establishes the user’s ability to approve a blockchain operation.
- The swap service or contract determines quote and execution behavior.
A Telegram account is not proof of wallet ownership, and a connected wallet is not proof of Telegram identity. The application must verify each context for the purpose it serves.
What TON Connect does—and does not do
If the product is built for TON, 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.
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TON’s documentation includes integration 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. It is therefore a wallet-connection and transaction-request protocol, not a swap aggregator, quote engine, router, or transaction-monitoring system. Those parts require separate design and implementation.
Do not apply TON Connect conclusions to other chains. The topic alone does not identify a blockchain, swap protocol, or wallet set, so it cannot establish the correct transaction protocol or execution design for a non-TON product.
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Telegram policy is not a blanket approval of swaps
TON’s Telegram guidance distinguishes digital goods and services sold inside Mini Apps, which use Telegram Stars, from permitted blockchain interactions available through TON Connect under Telegram’s blockchain guidelines. That distinction does not decide whether a particular swap product is permitted, and it is not a legal determination. Check the rules applicable to the actual product and its target markets.
Questions to settle before choosing the execution design
The interface split does not answer the product-specific questions that determine how a swap should work. Define these before committing to routing, confirmation, or compliance behavior:
- Which blockchain and swap protocol will execute trades?
- Which wallets must the product support, and what connection and transaction-request methods do they use?
- How will the service calculate and refresh quotes, present fees and slippage, and explain transaction consequences?
- How will it simulate or validate a transaction, track submission and confirmation, and recover from failures or timeouts?
- Does the product hold assets or keys, or does the user authorize transactions directly from a wallet?
- Where will the service operate, and what jurisdiction-specific requirements apply?
Those answers affect execution and availability; Telegram’s bot and Mini App features alone do not establish them.
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