A fast, low-level Telegram Bot API library for MQL5.
Requests are built directly into raw byte buffers (fixed-offset literal tables + ArrayCopy, a custom CJsonBuilder, and multipart with boundary reuse) instead of going through an intermediate DOM — no per-field allocation, no generic serialization pass.

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Main Features

• Full Bot API surface (CTelegramAPI): messages, polls (regular/quiz), documents/video/audio/voice/animation/photo (multipart), rich messages, chat actions, reactions, member management (ban/unban/restrict/promote), bot profile, chat management, callback query answers, message/reply-markup editing, poll stopping, deletes.
• Independent long-polling updater (CTelegramBotUpdater + CTelegramHandler): decoupled from CTelegramAPI — the bot only calls the API, the updater only polls and dispatches. Handlers register per event (27 event types) via bitmask or one at a time; AllowedUpdates() can auto-compute the allowed_updates filter from whichever events actually have a handler registered, so you don't get updates nobody is listening for.
• Perfect-hash update dispatch: incoming getUpdates keys are matched via a generated perfect hash (EnumReg), not string comparisons, before landing in the event switch.
• Keyboard builders (CTlgInlineKeyboard, CTlgReplyKeyboard): chainable, raw-buffer builders for InlineKeyboardMarkup / ReplyKeyboardMarkup. Both share a CTlgKeyboardBase (buffer + row/button bookkeeping) to avoid duplicating the same comma/bracket logic twice — not an "is-a" hierarchy, just shared plumbing.
• Snapshot/rollback for speculative writes: JsonBuilderSnapshot (JSON builder) and TlgKeyboardSnapshot (keyboards) capture position + internal stack state so an optional nested object (e.g. reply_parameters) can be written speculatively and rolled back cleanly if it ends up empty, without corrupting the builder's structural state.
• Validated vs. trusted string writes: library-controlled constants (parse mode names, chat actions, field keys) go through the unvalidated/raw path (KeyWV/ValUWV/SetBuffer); arbitrary user input always goes through the escaping path (ValS/SetStr) — chosen per call site, never blanket-escaped or blanket-trusted.

Send a message

#include "Src\\MainAPI.mqh"

TSN::CTelegramAPI bot;
bot.Token("123456:ABC-your-bot-token");
bot.ChatId(-100123456789);
bot.SendMessage("Hello from MQL5", TSN::TELEGRAM_PARSE_MODE_HTML);

Long polling with handlers

#include "Src\\Events.mqh"

class CMyHandler : public TSN::CTelegramHandler
 {
public:
  void OnMessage(TSN::CJsonNode& node) override
   {
    Print("Got message: ", node["text"].ToString());
   }
 };

TSN::CTelegramBotUpdater updater;
CMyHandler handler;

void OnInit()
 {
  updater.Token("123456:ABC-your-bot-token");
  updater.RegisterEvents(&handler, TSN::TELEGRAMBYLEO_REG_FLAG_ON_MESSAGE);
  // 20 seconds timeout telegram long polling
  updater.Timeout(30000); // 30 seg for web req
  updater.Init(20); // getUpdates() body: {"offset":-1,"limit":1}, discards backlog
  updater.AllowedUpdates(); // zero parameters (Auto)
 }

void OnTimer()
 {
  updater.GetUpdates();
 }

Inline keyboard

#include "Src\\Bottons\\Inline.mqh"

TSN::CTlgInlineKeyboard kb;
kb.Init();
kb.AddRow().AddBtnCallbackData("Yes", "vote_yes").AddBtnCallbackData("No", "vote_no").EndRow();
kb.Finish(); // {"inline_keyboard":[[{"text":"Yes","callback_data":"vote_yes"},{"text":"No","callback_data":"vote_no"}]]}

uchar reply_markup[];
bot.SendMessage("Vote:", WRONG_VALUE, base, rp, ep, kb.m_buf, kb.m_pos);

Reply keyboard

#include "Src\\Bottons\\ReplyMarkup.mqh"

TSN::CTlgReplyKeyboard kb;
kb.Init();
kb.IsPersistent(false).ResizeKeyboard(true).OneTimeKeyboard(true);
kb.InitArr();
kb.AddRow().AddBtn("Option A").AddBtn("Option B").EndRow();
kb.Finish(); // {"resize_keyboard":true,"one_time_keyboard":true,"keyboard":[["Option A","Option B"]]}

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Repository Structure

TelegramByLeo/
├── Bots/         # Example EAs using the library
├── EnumReg/      # Perfect-hash generator config for update-key dispatch
└── Src/
    ├── Base/     # Endpoints, shared structs, error/parse-mode enums
    ├── Bottons/  # Inline/Reply keyboard builders + shared keyboard base
    ├── Emojis/   # Emoji constant table
    └── Old/      # Previous (pre-rewrite) implementation, kept for reference

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Requirements

See dependencies.json for the full list.

• MetaTrader 5, build 5430+
• WebUtilsByLeo — currently a private dependency; contact @nique_372 for access.
• WebRequest access enabled for https://api.telegram.org

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Installation

cd "C:\Users\YOUR_USER\AppData\Roaming\MetaQuotes\Terminal\YOUR_ID\MQL5\Shared Projects"
tsndep install "https://forge.mql5.io/nique_372/TelegramByLeo.git"

Requires the tsndep package, available on PyPI. It automatically downloads and installs all declared dependencies.

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Quick Start

1. Include the library:

#include "..\\TelegramByLeo\\Src\\MainAPI.mqh"

2. Set the token and chat, and send something:

TSN::CTelegramAPI bot;
bot.Token("123456:ABC-your-bot-token");
bot.ChatId(-100123456789);
bot.SendMessage("Hello from MQL5");

3. (Optional) Add polling: see Long polling with handlers above.

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License

Read Full License By downloading or using this repository, you accept the license terms.

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Contact

• Platform: MQL5 Community
• Profile: https://www.mql5.com/es/users/nique_372
• Articles: https://www.mql5.com/es/users/nique_372/publications

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Roadmap

• Finish Get* methods (GetMyName, GetMyDescription, GetMyShortDescription) using the JSON parser side [In progress]
• RestrictChatMember / PromoteChatMember bodies
• KeyboardButtonRequestUsers / RequestChat support in CTlgReplyKeyboard