diff --git a/tests/libs/fixtures/__init__.py b/tests/libs/fixtures/__init__.py
index 235e05f6c..1286cdff8 100644
--- a/tests/libs/fixtures/__init__.py
+++ b/tests/libs/fixtures/__init__.py
@@ -1,4 +1,5 @@
 from .cli import default_cli_args
+from .network import free_port
 from .web3 import contracts_manager, keystore_file, mockchain, wait_for_blocks
 
 # Without declaring `__all__`, the names `cli` and `web3` would get imported
@@ -9,4 +10,5 @@
     "keystore_file",
     "mockchain",
     "default_cli_args",
+    "free_port",
 ]
diff --git a/tests/libs/fixtures/network.py b/tests/libs/fixtures/network.py
new file mode 100644
index 000000000..7995f21d8
--- /dev/null
+++ b/tests/libs/fixtures/network.py
@@ -0,0 +1,12 @@
+import socket
+
+import pytest
+
+
+@pytest.fixture(scope="session")
+def free_port() -> int:
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.bind(("localhost", 0))  # binding to port 0 will choose a free socket
+    port = sock.getsockname()[1]
+    sock.close()
+    return port
diff --git a/tests/monitoring/fixtures/api.py b/tests/monitoring/fixtures/api.py
index 3a1d105dc..cdd619831 100644
--- a/tests/monitoring/fixtures/api.py
+++ b/tests/monitoring/fixtures/api.py
@@ -1,5 +1,4 @@
 # pylint: disable=redefined-outer-name
-import socket
 from typing import Generator, Iterator
 from unittest.mock import Mock
 
@@ -9,8 +8,8 @@
 from tests.libs.mocks.web3 import Web3Mock
 
 from monitoring_service.api import MsApi
+from monitoring_service.constants import API_PATH
 from monitoring_service.service import MonitoringService
-from pathfinding_service.constants import API_PATH
 from raiden.utils.typing import BlockTimeout
 from raiden_contracts.constants import (
     CONTRACT_MONITORING_SERVICE,
@@ -21,15 +20,6 @@
 from raiden_libs.constants import DEFAULT_API_HOST
 
 
-@pytest.fixture(scope="session")
-def free_port() -> int:
-    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    sock.bind(("localhost", 0))  # binding to port 0 will choose a free socket
-    port = sock.getsockname()[1]
-    sock.close()
-    return port
-
-
 @pytest.fixture(scope="session")
 def api_url(free_port: int) -> str:
     return "http://localhost:{}{}".format(free_port, API_PATH)
diff --git a/tests/pathfinding/fixtures/api.py b/tests/pathfinding/fixtures/api.py
index fe1782505..e06c1a1dd 100644
--- a/tests/pathfinding/fixtures/api.py
+++ b/tests/pathfinding/fixtures/api.py
@@ -1,5 +1,4 @@
 # pylint: disable=redefined-outer-name
-import socket
 from typing import Iterator
 
 import pytest
@@ -13,15 +12,6 @@
 from ..utils import SimpleReachabilityContainer
 
 
-@pytest.fixture(scope="session")
-def free_port() -> int:
-    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    sock.bind(("localhost", 0))  # binding to port 0 will choose a free socket
-    port = sock.getsockname()[1]
-    sock.close()
-    return port
-
-
 @pytest.fixture(scope="session")
 def api_url(free_port: int) -> str:
     return "http://localhost:{}{}".format(free_port, API_PATH)