diff --git a/services/dcs/src/dcs/py.typed b/services/dcs/src/dcs/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/dcs/src/dcs/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.
diff --git a/services/ekss/src/ekss/py.typed b/services/ekss/src/ekss/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/ekss/src/ekss/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.
diff --git a/services/fis/src/fis/py.typed b/services/fis/src/fis/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/fis/src/fis/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.
diff --git a/services/ifrs/src/ifrs/py.typed b/services/ifrs/src/ifrs/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/ifrs/src/ifrs/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.
diff --git a/services/irs/src/irs/py.typed b/services/irs/src/irs/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/irs/src/irs/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.
diff --git a/services/pcs/src/pcs/py.typed b/services/pcs/src/pcs/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/pcs/src/pcs/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.
diff --git a/services/ucs/src/ucs/py.typed b/services/ucs/src/ucs/py.typed
new file mode 100644
index 00000000..d3245e74
--- /dev/null
+++ b/services/ucs/src/ucs/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561. This package uses inline types.