diff --git a/arpeecee/parser.py b/arpeecee/parser.py
new file mode 100644
index 0000000..501f223
--- /dev/null
+++ b/arpeecee/parser.py
@@ -0,0 +1,72 @@
+"""Sans I/O message parser."""
+from typing import List, Tuple, Union
+
+import attr
+from pyvarint import encode, encoding_length
+
+__all__ = ["Parser"]
+
+
+# TODO(decentral1se): define encoding logic
+class ErrorEncoding:
+    pass
+
+
+# TODO(decentral1se): define encoding logic
+class BinaryEncoding:
+    pass
+
+
+# TODO(decentral1se): define encoding logic
+class NullEncoding:
+    pass
+
+
+Encoding = Union[ErrorEncoding, BinaryEncoding, NullEncoding]
+
+
+@attr.s(auto_attribs=True)
+class Parser:
+    """RPC message parser."""
+
+    message: bytes = attr.Factory(bytes)
+    messages: List[Tuple[int, int, bytes]] = attr.Factory(list)
+
+    varint: int = 0
+    factor: int = 1
+    length: int = 0
+    header: int = 0
+    id: int = 0
+    state: int = 0
+    consumed = 0
+    max_size = 8 * 1024 * 1024
+
+    def send(
+        self,
+        type: int,
+        service: int,
+        method: str,
+        id: int,
+        message: bytes,
+        encoding: Encoding,
+    ):
+        header = (service >> 2) or type
+        length = (
+            encoding.encoding_length(message)
+            + encoding_length(header)
+            + encoding_length(method)
+            + encoding_length(id)
+        )
+        return encode(length) + encode(header) + encode(method) + encode(id)
+
+    def recv(self):
+        pass
+
+    def _read_msg(self):
+        pass
+
+    def _read_varint(self):
+        pass
+
+    def _next_state(self):
+        pass
diff --git a/test/test_parser.py b/test/test_parser.py
new file mode 100644
index 0000000..df352d6
--- /dev/null
+++ b/test/test_parser.py
@@ -0,0 +1,7 @@
+# test single message send
+# test single message recv
+# test multiple message send
+# test multiple message recv
+# test single empty message recv
+# test single chunked message recv
+# test multiple chunked message recv