diff --git a/tgram/__init__.py b/tgram/__init__.py
index 9d55650..2fe277a 100644
--- a/tgram/__init__.py
+++ b/tgram/__init__.py
@@ -1,38 +1,15 @@
+import aiohttp
+
 from .methods import Methods
 from .decorators import Decorators
-
+from .filters import Filter
+from .handlers import Handlers, Handler
 from . import types
 
-from typing import List
+from typing import List, Callable
 
 __all__ = ["types", "TgBot", "Handlers"]
 
-
-class Handlers:
-    MESSAGE = "message"
-    EDITED_MESSAGE = "edited_message"
-    CHANNEL_POST = "channel_post"
-    EDITED_CHANNEL_POST = "edited_channel_post"
-    BUSINESS_CONNECTION = "business_connection"
-    BUSINESS_MESSAGE = "business_message"
-    EDITED_BUSINESS_MESSAGE = "edited_business_message"
-    DELETED_BUSINESS_MESSAGES = "deleted_business_messages"
-    MESSAGE_REACTION = "message_reaction"
-    MESSAGE_REACTION_COUNT = "message_reaction_count"
-    INLINE_QUERY = "inline_query"
-    CHOSEN_INLINE_RESULT = "chosen_inline_result"
-    CALLBACK_QUERY = "callback_query"
-    SHIPPING_QUERY = "shipping_query"
-    PRE_CHECKOUT_QUERY = "pre_checkout_query"
-    POLL = "poll"
-    POLL_ANSWER = "poll_answer"
-    MY_CHAT_MEMBER = "my_chat_member"
-    CHAT_MEMBER = "chat_member"
-    CHAT_JOIN_REQUEST = "chat_join_request"
-    CHAT_BOOST = "chat_boost"
-    REMOVED_CHAT_BOOST = "removed_chat_boost"
-
-
 API_URL = "https://api.telegram.org/"
 ALL_UPDATES = [
     getattr(Handlers, i)
@@ -41,9 +18,40 @@ class Handlers:
 
 
 class TgBot(Methods, Decorators):
+    _session: "aiohttp.ClientSession" = None
+    _handlers: List["Handler"] = []
+    _api_url: str = None
+
     def __init__(
         self, bot_token: str, api_url: str = API_URL, allowed_updates: List[str] = []
     ) -> None:
         self.bot_token = bot_token
         self.api_url = api_url
         self.allowed_updates = allowed_updates
+
+        if not api_url.endswith("/"):
+            api_url += "/"
+
+        self._api_url = f"{api_url}bot{bot_token}/"
+
+    def add_handler(self, func: Callable, handler: Handlers, filters: Filter) -> bool:
+        self._handlers.append(Handler(func, handler, filters))
+        return True
+
+    async def _new_session(self) -> None:
+        session = aiohttp.ClientSession(connector=aiohttp.TCPConnector(limit=50))
+        self._session = session
+
+    async def _get_session(self) -> "aiohttp.ClientSession":
+        if self._session is None or self._session.closed:
+            await self._new_session()
+        elif not self._session.loop.is_running():
+            await self._session.close()
+            await self._new_session()
+
+        return self._session
+
+    async def _send_request(self, method: str, data: dict):
+        request_url = self._api_url + method
+        session = await self._get_session()
+        # TODO
diff --git a/tgram/filters.py b/tgram/filters.py
new file mode 100644
index 0000000..8555cb7
--- /dev/null
+++ b/tgram/filters.py
@@ -0,0 +1,98 @@
+from typing import Callable, Any
+
+
+class Filter:
+    def __init__(self, filter_: Callable[[Any], bool]) -> None:
+        self._filter = filter_
+
+    def __call__(self, arg: Any) -> bool:
+        return self._filter(arg)
+
+    def __invert__(self) -> "Filter":
+        return Filter(lambda v: not self(v))
+
+    def __and__(self, other: "Filter") -> "Filter":
+        return Filter(lambda v: self(v) and other(v))
+
+    def __or__(self, other: "Filter") -> "Filter":
+        return Filter(lambda v: self(v) or other(v))
+
+
+threaded = Filter(lambda m: getattr(m, "message_thread_id"))
+from_user = Filter(lambda m: getattr(m, "from_user"))
+sender_chat = Filter(lambda m: getattr(m, "sender_chat"))
+business_connection_id = Filter(lambda m: getattr(m, "business_connection_id"))
+forward = Filter(lambda m: getattr(m, "forward_origin"))
+topic_message = Filter(lambda m: getattr(m, "is_topic_message"))
+automatic_forward = Filter(lambda m: getattr(m, "is_automatic_forward"))
+reply = Filter(lambda m: getattr(m, "reply_to_message"))
+quote = Filter(lambda m: getattr(m, "quote"))
+reply_to_story = Filter(lambda m: getattr(m, "reply_to_story"))
+via_bot = Filter(lambda m: getattr(m, "via_bot"))
+protected_content = Filter(lambda m: getattr(m, "has_protected_content"))
+from_offline = Filter(lambda m: getattr(m, "is_from_offline"))
+media_group = Filter(lambda m: getattr(m, "media_group_id"))
+text = Filter(lambda m: getattr(m, "text"))
+entities = Filter(lambda m: getattr(m, "entities"))
+effected_message = Filter(lambda m: getattr(m, "effect_id"))
+animation = Filter(lambda m: getattr(m, "animation"))
+audio = Filter(lambda m: getattr(m, "audio"))
+document = Filter(lambda m: getattr(m, "document"))
+photo = Filter(lambda m: getattr(m, "photo"))
+sticker = Filter(lambda m: getattr(m, "sticker"))
+story = Filter(lambda m: getattr(m, "story"))
+video = Filter(lambda m: getattr(m, "video"))
+video_note = Filter(lambda m: getattr(m, "video_note"))
+voice = Filter(lambda m: getattr(m, "voice"))
+caption = Filter(lambda m: getattr(m, "caption"))
+media_spoiler = Filter(lambda m: getattr(m, "has_media_spoiler"))
+contact = Filter(lambda m: getattr(m, "contact"))
+dice = Filter(lambda m: getattr(m, "dice"))
+game = Filter(lambda m: getattr(m, "game"))
+poll = Filter(lambda m: getattr(m, "poll"))
+venue = Filter(lambda m: getattr(m, "venue"))
+location = Filter(lambda m: getattr(m, "location"))
+new_chat_members = Filter(lambda m: getattr(m, "new_chat_members"))
+left_chat_member = Filter(lambda m: getattr(m, "left_chat_member"))
+new_chat_title = Filter(lambda m: getattr(m, "new_chat_title"))
+new_chat_photo = Filter(lambda m: getattr(m, "new_chat_photo"))
+delete_chat_photo = Filter(lambda m: getattr(m, "delete_chat_photo"))
+group_chat_created = Filter(lambda m: getattr(m, "group_chat_created"))
+supergroup_chat_created = Filter(lambda m: getattr(m, "supergroup_chat_created"))
+channel_chat_created = Filter(lambda m: getattr(m, "channel_chat_created"))
+message_auto_delete_timer_changed = Filter(
+    lambda m: getattr(m, "message_auto_delete_timer_changed")
+)
+migrate_to_chat_id = Filter(lambda m: getattr(m, "migrate_to_chat_id"))
+migrate_from_chat_id = Filter(lambda m: getattr(m, "migrate_from_chat_id"))
+pinned_message = Filter(lambda m: getattr(m, "pinned_message"))
+invoice = Filter(lambda m: getattr(m, "invoice"))
+successful_payment = Filter(lambda m: getattr(m, "successful_payment"))
+users_shared = Filter(lambda m: getattr(m, "users_shared"))
+chat_shared = Filter(lambda m: getattr(m, "chat_shared"))
+connected_website = Filter(lambda m: getattr(m, "connected_website"))
+write_access_allowed = Filter(lambda m: getattr(m, "write_access_allowed"))
+passport_data = Filter(lambda m: getattr(m, "passport_data"))
+proximity_alert_triggered = Filter(lambda m: getattr(m, "proximity_alert_triggered"))
+boost_added = Filter(lambda m: getattr(m, "boost_added"))
+chat_background_set = Filter(lambda m: getattr(m, "chat_background_set"))
+forum_topic_created = Filter(lambda m: getattr(m, "forum_topic_created"))
+forum_topic_edited = Filter(lambda m: getattr(m, "forum_topic_edited"))
+forum_topic_closed = Filter(lambda m: getattr(m, "forum_topic_closed"))
+forum_topic_reopened = Filter(lambda m: getattr(m, "forum_topic_reopened"))
+general_forum_topic_hidden = Filter(lambda m: getattr(m, "general_forum_topic_hidden"))
+general_forum_topic_unhidden = Filter(
+    lambda m: getattr(m, "general_forum_topic_unhidden")
+)
+giveaway_created = Filter(lambda m: getattr(m, "giveaway_created"))
+giveaway = Filter(lambda m: getattr(m, "giveaway"))
+giveaway_winners = Filter(lambda m: getattr(m, "giveaway_winners"))
+giveaway_completed = Filter(lambda m: getattr(m, "giveaway_completed"))
+video_chat_scheduled = Filter(lambda m: getattr(m, "video_chat_scheduled"))
+video_chat_started = Filter(lambda m: getattr(m, "video_chat_started"))
+video_chat_ended = Filter(lambda m: getattr(m, "video_chat_ended"))
+video_chat_participants_invited = Filter(
+    lambda m: getattr(m, "video_chat_participants_invited")
+)
+web_app_data = Filter(lambda m: getattr(m, "web_app_data"))
+reply_markup = Filter(lambda m: getattr(m, "reply_markup"))
diff --git a/tgram/handlers.py b/tgram/handlers.py
new file mode 100644
index 0000000..71da5a8
--- /dev/null
+++ b/tgram/handlers.py
@@ -0,0 +1,35 @@
+from .filters import Filter
+
+from typing import Callable
+
+
+class Handlers:
+    MESSAGE = "message"
+    EDITED_MESSAGE = "edited_message"
+    CHANNEL_POST = "channel_post"
+    EDITED_CHANNEL_POST = "edited_channel_post"
+    BUSINESS_CONNECTION = "business_connection"
+    BUSINESS_MESSAGE = "business_message"
+    EDITED_BUSINESS_MESSAGE = "edited_business_message"
+    DELETED_BUSINESS_MESSAGES = "deleted_business_messages"
+    MESSAGE_REACTION = "message_reaction"
+    MESSAGE_REACTION_COUNT = "message_reaction_count"
+    INLINE_QUERY = "inline_query"
+    CHOSEN_INLINE_RESULT = "chosen_inline_result"
+    CALLBACK_QUERY = "callback_query"
+    SHIPPING_QUERY = "shipping_query"
+    PRE_CHECKOUT_QUERY = "pre_checkout_query"
+    POLL = "poll"
+    POLL_ANSWER = "poll_answer"
+    MY_CHAT_MEMBER = "my_chat_member"
+    CHAT_MEMBER = "chat_member"
+    CHAT_JOIN_REQUEST = "chat_join_request"
+    CHAT_BOOST = "chat_boost"
+    REMOVED_CHAT_BOOST = "removed_chat_boost"
+
+
+class Handler:
+    def __init__(self, callback: Callable, type: str, filters: Filter) -> None:
+        self.callback = callback
+        self.type = type
+        self.filter = filters
diff --git a/tgram/methods.py b/tgram/methods.py
index afc9aaa..8d855a2 100644
--- a/tgram/methods.py
+++ b/tgram/methods.py
@@ -13,7 +13,7 @@ async def get_updates(
         offset: int = None,
         limit: int = None,
         timeout: int = None,
-        allowed_updates: List[str] = None,
+        allowed_updates: List[str] = [],
     ) -> List[Update]:
         """https://core.telegram.org/bots/api/#getupdates"""
         ...