diff --git a/oxrlib/loaders.py b/oxrlib/loaders.py
new file mode 100644
index 0000000000000000000000000000000000000000..95020c97e96216299555d48e08b95868d9f9fe8a
--- /dev/null
+++ b/oxrlib/loaders.py
@@ -0,0 +1,9 @@
+class FileCache:
+    def __init__(self, dir_path, filename_pattern):
+        self.dir_path = dir_path
+        self.pattern = filename_pattern
+
+    def historical(self, date, base):
+        path = self.dir_path / self.pattern.format(date=date.isoformat(), base=base)
+        return path.open()
+