diff --git a/host/basic_host.py b/host/basic_host.py
index e69de29..b0c5a7d 100644
--- a/host/basic_host.py
+++ b/host/basic_host.py
@@ -0,0 +1,9 @@
+from host_interface import Host 
+
+# Upon host creation, host takes in options, 
+# including the list of addresses on which to listen.
+# Host then parses these options and delegates to its Network instance, 
+# telling it to listen on the given listen addresses.
+
+class BasicHost(Host):
+	pass
\ No newline at end of file
diff --git a/host/host_interface.py b/host/host_interface.py
new file mode 100644
index 0000000..ac53c23
--- /dev/null
+++ b/host/host_interface.py
@@ -0,0 +1,51 @@
+from abc import ABC
+
+class Host(ABC):
+
+	# default options constructor
+	def __init__(self, context, network):
+		self.context = context
+		self.network = network
+
+	@abstractmethod
+	def id(self):
+		"""
+		:return: peer_id of host
+		"""
+		pass
+
+	@abstractmethod
+	def network(self):
+		"""
+		:return: network instance of host
+		"""
+		pass
+
+	@abstractmethod
+	def mux(self):
+		"""
+		:return: mux instance of host
+		"""
+		pass
+
+	@abstractmethod
+	def set_stream_handler(self, protocol_id, stream_handler):
+		"""
+		set stream handler for host
+		:param protocol_id: protocol id used on stream
+		:param stream_handler: a stream handler function
+		:return: true if successful
+		"""
+		pass
+
+	# protocol_id can be a list of protocol_ids
+	# stream will decide which protocol_id to run on
+	@abstractmethod
+	def new_stream(self, context, peer_id, protocol_id):
+		"""
+		:param context: a context instance
+		:param peer_id: peer_id that host is connecting
+		:param proto_id: protocol id that stream runs on
+		:return: true if successful
+		"""
+		pass
\ No newline at end of file
diff --git a/host/interface.py b/host/interface.py
deleted file mode 100644
index e69de29..0000000
diff --git a/network/network_interface.py b/network/network_interface.py
new file mode 100644
index 0000000..fb6c7a4
--- /dev/null
+++ b/network/network_interface.py
@@ -0,0 +1,25 @@
+from abc import ABC
+
+class Network(ABC):
+
+	def __init__(self, context, my_peer_id, peer_store):
+		self.context = context
+		self.my_peer_id = my_peer_id
+		self.peer_store = peer_store
+
+	@abstractmethod
+	def set_stream_handler(stream_handler):
+		"""
+		:param stream_handler: a stream handler instance
+		:return: true if successful
+		"""
+		pass
+
+	@abstractmethod
+	def new_stream(context, peer_id):
+		"""
+		:param context: context instance
+		:param peer_id: peer_id of destination
+		:return: stream instance
+		"""
+		pass
diff --git a/network/stream_interface.py b/network/stream_interface.py
new file mode 100644
index 0000000..3d92d8e
--- /dev/null
+++ b/network/stream_interface.py
@@ -0,0 +1,47 @@
+from abc import ABC
+
+class Stream(ABC):
+
+	def __init__(self, context, peer_id):
+		self.context = context
+		self.peer_id = peer_id
+
+	@abstractmethod
+	def protocol():
+		"""
+		:return: protocol id that stream runs on
+		"""
+		pass
+
+	@abstractmethod
+	def set_protocol(protocol_id):
+		"""
+		:param protocol_id: protocol id that stream runs on
+		:return: true if successful
+		"""
+		pass
+
+	@abstractmethod
+	def read():
+		"""
+		read from stream
+		:return: bytes of input
+		"""
+		pass
+
+	@abstractmethod
+	def write(bytes):
+		"""
+		write to stream
+		:return: number of bytes written
+		"""
+		pass
+
+	@abstractmethod
+	def close():
+		"""
+		close stream
+		:return: true if successful
+		"""
+		pass
+
diff --git a/network/swarm.py b/network/swarm.py
new file mode 100644
index 0000000..feb91e3
--- /dev/null
+++ b/network/swarm.py
@@ -0,0 +1,4 @@
+from network_interface import Network
+
+class Swarm(Network):
+	pass
\ No newline at end of file