diff --git a/oxrlib/loaders.py b/oxrlib/loaders.py
index e839dddcbb9c18748fc020fdae6f2cd04a373b06..5213a40df3b28e6172015d89f62a2ee4b624249d 100644
--- a/oxrlib/loaders.py
+++ b/oxrlib/loaders.py
@@ -1,4 +1,5 @@
 import cgi
+import functools
 import io
 import urllib.request
 import urllib.parse
@@ -19,6 +20,10 @@ class LoaderSourceError(LoaderError):
     pass
 
 
+class NoLoadersError(Exception):
+    pass
+
+
 class FileCache:
     def __init__(self, dir_path, filename_pattern):
         self.dir_path = dir_path
@@ -75,3 +80,32 @@ class OXRAPIRequest:
             'historical/{}.json'.format(date.isoformat()),
             {'app_id': self.app_id, 'base': base},
         )
+
+
+class LoaderChain:
+    def __init__(self):
+        self.loaders = []
+
+    def add_loader(self, loader):
+        self.loaders.append(loader)
+
+    def _wrap_load_method(orig_func):
+        @functools.wraps(orig_func)
+        def load_wrapper(self, *args, **kwargs):
+            self.used_loader = None
+            error = None
+            for loader in self.loaders:
+                try:
+                    response = getattr(loader, orig_func.__name__)(*args, **kwargs)
+                except LoaderError as this_error:
+                    error = this_error
+                else:
+                    self.used_loader = loader
+                    return response
+            else:
+                raise NoLoadersError() if error is None else error
+        return load_wrapper
+
+    @_wrap_load_method
+    def historical(self, date, base):
+        pass