diff --git a/jupyter_server_fileid/extension.py b/jupyter_server_fileid/extension.py
index 2967923..ad605f7 100644
--- a/jupyter_server_fileid/extension.py
+++ b/jupyter_server_fileid/extension.py
@@ -4,6 +4,8 @@
 
 from jupyter_server_fileid.manager import FileIdManager
 
+from .handlers import FileId2PathHandler, FilePath2IdHandler
+
 
 class FileIdExtension(ExtensionApp):
 
@@ -44,3 +46,17 @@ async def cm_listener(logger: EventLogger, schema_id: str, data: dict) -> None:
             schema_id="https://events.jupyter.org/jupyter_server/contents_service/v1",
             listener=cm_listener,
         )
+
+    def initialize_handlers(self):
+        self.handlers.extend(
+            [
+                (
+                    r"/api/fileid/id/(.*)",
+                    FilePath2IdHandler,
+                ),
+                (
+                    r"/api/fileid/path/(.*)",
+                    FileId2PathHandler,
+                ),
+            ],
+        )
diff --git a/jupyter_server_fileid/handlers.py b/jupyter_server_fileid/handlers.py
new file mode 100644
index 0000000..76d6dd3
--- /dev/null
+++ b/jupyter_server_fileid/handlers.py
@@ -0,0 +1,64 @@
+from jupyter_server.auth import authorized
+from jupyter_server.base.handlers import APIHandler
+from tornado import web
+
+AUTH_RESOURCE = "contents"
+
+
+class FileIdAPIHandler(APIHandler):
+    auth_resource = AUTH_RESOURCE
+
+
+class FilePath2IdHandler(FileIdAPIHandler):
+    @web.authenticated
+    @authorized
+    async def get(self, path):
+        manager = self.settings["file_id_manager"]
+
+        idx = manager.get_id(path)
+        if idx is None:
+            # index does not exist
+            raise web.HTTPError(404, f"No ID found for file {path!r}")
+
+        # index exists, return it
+        return self.finish(str(idx))
+
+    @web.authenticated
+    @authorized
+    async def put(self, path):
+        manager = self.settings["file_id_manager"]
+
+        idx = manager.get_id(path)
+        if idx is not None:
+            # index already exists
+            self.set_status(200)
+            return self.finish(str(idx))
+
+        # try indexing
+        idx = manager.index(path)
+        if idx is None:
+            # file does not exists
+            raise web.HTTPError(404, f"File {path!r} does not exist")
+
+        # index successfully created
+        self.set_status(201)
+        return self.finish(str(idx))
+
+
+class FileId2PathHandler(FileIdAPIHandler):
+    @web.authenticated
+    @authorized
+    async def get(self, idx):
+        manager = self.settings["file_id_manager"]
+
+        path = manager.get_path(idx)
+
+        if path is None:
+            raise web.HTTPError(404, f"No path found for ID {idx!r}")
+
+        return self.finish(str(path))
+
+    @web.authenticated
+    @authorized
+    async def put(self, idx):
+        raise web.HTTPError(501, "Cannot set a file's ID")