diff --git a/server/api/users/:uuid/inbox/index.ts b/server/api/users/:uuid/inbox/index.ts
index 6b92954d..3ae9cf76 100644
--- a/server/api/users/:uuid/inbox/index.ts
+++ b/server/api/users/:uuid/inbox/index.ts
@@ -92,6 +92,13 @@ export default (app: Hono) =>
                 return errorResponse("User not found", 404);
             }
 
+            if (user.isRemote()) {
+                return errorResponse(
+                    "Cannot view users from remote instances",
+                    403,
+                );
+            }
+
             // @ts-expect-error IP attribute is not in types
             const requestIp = context.env?.ip as
                 | SocketAddress
diff --git a/server/api/users/:uuid/index.ts b/server/api/users/:uuid/index.ts
index 10027eed..7a073362 100644
--- a/server/api/users/:uuid/index.ts
+++ b/server/api/users/:uuid/index.ts
@@ -37,6 +37,13 @@ export default (app: Hono) =>
                 return errorResponse("User not found", 404);
             }
 
+            if (user.isRemote()) {
+                return errorResponse(
+                    "Cannot view users from remote instances",
+                    403,
+                );
+            }
+
             return jsonResponse(user.toLysand());
         },
     );
diff --git a/server/api/users/:uuid/outbox/index.ts b/server/api/users/:uuid/outbox/index.ts
index 73715547..c057e7d6 100644
--- a/server/api/users/:uuid/outbox/index.ts
+++ b/server/api/users/:uuid/outbox/index.ts
@@ -48,6 +48,13 @@ export default (app: Hono) =>
                 return errorResponse("User not found", 404);
             }
 
+            if (author.isRemote()) {
+                return errorResponse(
+                    "Cannot view users from remote instances",
+                    403,
+                );
+            }
+
             const pageNumber = Number(context.req.valid("query").page) || 1;
 
             const notes = await Note.manyFromSql(