diff --git a/src/app.ts b/src/app.ts
index ff57ec0..ef59c8f 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -29,7 +29,7 @@ import {
   verifyCredentialsController,
 } from './controllers/api/accounts.ts';
 import { appCredentialsController, createAppController } from './controllers/api/apps.ts';
-import { emptyArrayController, emptyObjectController } from './controllers/api/fallback.ts';
+import { emptyArrayController, emptyObjectController, notImplementedController } from './controllers/api/fallback.ts';
 import { instanceController } from './controllers/api/instance.ts';
 import { mediaController } from './controllers/api/media.ts';
 import { notificationsController } from './controllers/api/notifications.ts';
@@ -157,6 +157,8 @@ app.get('/api/v1/markers', emptyObjectController);
 app.get('/api/v1/conversations', emptyArrayController);
 app.get('/api/v1/lists', emptyArrayController);
 
+app.use('/api/*', notImplementedController);
+
 app.get('*', serveStatic({ root: './public/' }));
 app.get('*', serveStatic({ path: './public/index.html' }));
 
diff --git a/src/controllers/api/fallback.ts b/src/controllers/api/fallback.ts
index c57de7a..b46460e 100644
--- a/src/controllers/api/fallback.ts
+++ b/src/controllers/api/fallback.ts
@@ -2,5 +2,6 @@ import type { Context } from '@/deps.ts';
 
 const emptyArrayController = (c: Context) => c.json([]);
 const emptyObjectController = (c: Context) => c.json({});
+const notImplementedController = (c: Context) => Promise.resolve(c.json({ error: 'Not implemented' }, 404));
 
-export { emptyArrayController, emptyObjectController };
+export { emptyArrayController, emptyObjectController, notImplementedController };