diff --git a/a2s/a2s_async.py b/a2s/a2s_async.py
index 04399d0..473fb48 100644
--- a/a2s/a2s_async.py
+++ b/a2s/a2s_async.py
@@ -4,45 +4,29 @@ import asyncio
 import io
 import logging
 import time
-from typing import (
-    TYPE_CHECKING,
-    Any,
-    List,
-    NoReturn,
-    Optional,
-    Tuple,
-    Type,
-    TypeVar,
-    Union,
-)
+from typing import TYPE_CHECKING, Any, List, NoReturn, Optional, Tuple, Type
 
 from a2s.a2s_fragment import A2SFragment, decode_fragment
+from a2s.a2s_protocol import A2SProtocol
 from a2s.byteio import ByteReader
 from a2s.defaults import DEFAULT_RETRIES
 from a2s.exceptions import BrokenMessageError
 
-from .info import InfoProtocol
-from .players import PlayersProtocol
-from .rules import RulesProtocol
-
 if TYPE_CHECKING:
     from typing_extensions import Self
 
 HEADER_SIMPLE = b"\xFF\xFF\xFF\xFF"
 HEADER_MULTI = b"\xFE\xFF\xFF\xFF"
 A2S_CHALLENGE_RESPONSE = 0x41
-PROTOCOLS = Union[InfoProtocol, PlayersProtocol, RulesProtocol]
 
 logger: logging.Logger = logging.getLogger("a2s")
 
-ProtocolT = TypeVar("ProtocolT", InfoProtocol, PlayersProtocol, RulesProtocol)
-
 
 async def request_async(
     address: Tuple[str, int],
     timeout: float,
     encoding: str,
-    a2s_proto: Type[ProtocolT],
+    a2s_proto: Type[A2SProtocol],
 ) -> Any:
     conn = await A2SStreamAsync.create(address, timeout)
     response = await request_async_impl(conn, encoding, a2s_proto)
@@ -53,7 +37,7 @@ async def request_async(
 async def request_async_impl(
     conn: A2SStreamAsync,
     encoding: str,
-    a2s_proto: Type[ProtocolT],
+    a2s_proto: Type[A2SProtocol],
     challenge: int = 0,
     retries: int = 0,
     ping: Optional[float] = None,
@@ -86,7 +70,7 @@ async def request_async_impl(
     return a2s_proto.deserialize_response(reader, response_type, ping)
 
 
-class A2SProtocol(asyncio.DatagramProtocol):
+class A2SDatagramProtocol(asyncio.DatagramProtocol):
     def __init__(self) -> None:
         self.recv_queue: asyncio.Queue[bytes] = asyncio.Queue()
         self.error_event: asyncio.Event = asyncio.Event()
@@ -142,11 +126,11 @@ class A2SStreamAsync:
     def __init__(
         self,
         transport: asyncio.DatagramTransport,
-        protocol: A2SProtocol,
+        protocol: A2SDatagramProtocol,
         timeout: float,
     ) -> None:
         self.transport: asyncio.DatagramTransport = transport
-        self.protocol: A2SProtocol = protocol
+        self.protocol: A2SDatagramProtocol = protocol
         self.timeout: float = timeout
 
     def __del__(self) -> None:
@@ -156,7 +140,7 @@ class A2SStreamAsync:
     async def create(cls, address: Tuple[str, int], timeout: float) -> Self:
         loop = asyncio.get_running_loop()
         transport, protocol = await loop.create_datagram_endpoint(
-            lambda: A2SProtocol(), remote_addr=address
+            lambda: A2SDatagramProtocol(), remote_addr=address
         )
         return cls(transport, protocol, timeout)
 
diff --git a/a2s/a2s_protocol.py b/a2s/a2s_protocol.py
new file mode 100644
index 0000000..bf5b5b9
--- /dev/null
+++ b/a2s/a2s_protocol.py
@@ -0,0 +1,22 @@
+__all__ = ("A2SProtocol",)
+
+
+from typing import Any, Optional
+
+from .byteio import ByteReader
+
+
+class A2SProtocol:
+    @staticmethod
+    def serialize_request(challenge: int) -> bytes:
+        raise NotImplemented
+
+    @staticmethod
+    def validate_response_type(response_type: int) -> bool:
+        raise NotImplemented
+
+    @staticmethod
+    def deserialize_response(
+        reader: ByteReader, response_type: int, ping: Optional[float]
+    ) -> Any:
+        raise NotImplemented
diff --git a/a2s/a2s_sync.py b/a2s/a2s_sync.py
index 9266885..dc2c2cc 100644
--- a/a2s/a2s_sync.py
+++ b/a2s/a2s_sync.py
@@ -4,29 +4,26 @@ import io
 import logging
 import socket
 import time
-from typing import Any, Optional, Tuple, Type, TypeVar, Union
+from typing import Any, Optional, Tuple, Type
 
 from a2s.a2s_fragment import decode_fragment
+from a2s.a2s_protocol import A2SProtocol
 from a2s.byteio import ByteReader
 from a2s.defaults import DEFAULT_RETRIES
 from a2s.exceptions import BrokenMessageError
 
-from .info import InfoProtocol
-from .players import PlayersProtocol
-from .rules import RulesProtocol
-
 HEADER_SIMPLE = b"\xFF\xFF\xFF\xFF"
 HEADER_MULTI = b"\xFE\xFF\xFF\xFF"
 A2S_CHALLENGE_RESPONSE = 0x41
-PROTOCOLS = Union[InfoProtocol, RulesProtocol, PlayersProtocol]
 
 logger: logging.Logger = logging.getLogger("a2s")
 
-T = TypeVar("T", InfoProtocol, RulesProtocol, PlayersProtocol)
-
 
 def request_sync(
-    address: Tuple[str, int], timeout: float, encoding: str, a2s_proto: Type[T]
+    address: Tuple[str, int],
+    timeout: float,
+    encoding: str,
+    a2s_proto: Type[A2SProtocol],
 ) -> Any:
     conn = A2SStream(address, timeout)
     response = request_sync_impl(conn, encoding, a2s_proto)
@@ -37,7 +34,7 @@ def request_sync(
 def request_sync_impl(
     conn: A2SStream,
     encoding: str,
-    a2s_proto: Type[T],
+    a2s_proto: Type[A2SProtocol],
     challenge: int = 0,
     retries: int = 0,
     ping: Optional[float] = None,
diff --git a/a2s/info.py b/a2s/info.py
index e697583..c563e80 100644
--- a/a2s/info.py
+++ b/a2s/info.py
@@ -8,6 +8,7 @@ from a2s.datacls import DataclsMeta
 from a2s.defaults import DEFAULT_ENCODING, DEFAULT_TIMEOUT
 from a2s.exceptions import BufferExhaustedError
 
+from .a2s_protocol import A2SProtocol
 from .byteio import ByteReader
 
 A2S_INFO_RESPONSE = 0x49
@@ -204,7 +205,7 @@ async def ainfo(
     return await request_async(address, timeout, encoding, InfoProtocol)
 
 
-class InfoProtocol:
+class InfoProtocol(A2SProtocol):
     @staticmethod
     def validate_response_type(response_type: int) -> bool:
         return response_type in (A2S_INFO_RESPONSE, A2S_INFO_RESPONSE_LEGACY)
diff --git a/a2s/players.py b/a2s/players.py
index 2ba3959..0b9e034 100644
--- a/a2s/players.py
+++ b/a2s/players.py
@@ -1,6 +1,7 @@
 from typing import List, Optional, Tuple
 
 from a2s.a2s_async import request_async
+from a2s.a2s_protocol import A2SProtocol
 from a2s.a2s_sync import request_sync
 from a2s.byteio import ByteReader
 from a2s.datacls import DataclsMeta
@@ -45,7 +46,7 @@ async def aplayers(
     return await request_async(address, timeout, encoding, PlayersProtocol)
 
 
-class PlayersProtocol:
+class PlayersProtocol(A2SProtocol):
     @staticmethod
     def validate_response_type(response_type: int) -> bool:
         return response_type == A2S_PLAYER_RESPONSE
diff --git a/a2s/rules.py b/a2s/rules.py
index 5575c65..06e4c7b 100644
--- a/a2s/rules.py
+++ b/a2s/rules.py
@@ -1,6 +1,7 @@
 from typing import Dict, Optional, Tuple, Union
 
 from a2s.a2s_async import request_async
+from a2s.a2s_protocol import A2SProtocol
 from a2s.a2s_sync import request_sync
 from a2s.byteio import ByteReader
 from a2s.defaults import DEFAULT_ENCODING, DEFAULT_TIMEOUT
@@ -29,7 +30,7 @@ async def arules(
     return await request_async(address, timeout, encoding, RulesProtocol)
 
 
-class RulesProtocol:
+class RulesProtocol(A2SProtocol):
     @staticmethod
     def validate_response_type(response_type: int) -> bool:
         return response_type == A2S_RULES_RESPONSE