diff --git a/src/server/api/endpoints/notifications/read.ts b/src/server/api/endpoints/notifications/read.ts
new file mode 100644
index 0000000000..fe8e5ba44f
--- /dev/null
+++ b/src/server/api/endpoints/notifications/read.ts
@@ -0,0 +1,42 @@
+import $ from 'cafy';
+import { ID } from '@/misc/cafy-id';
+import { publishMainStream } from '../../../../services/stream';
+import define from '../../define';
+import { Notifications } from '../../../../models';
+import { readNotification } from '../../common/read-notification';
+import { ApiError } from '../../error';
+
+export const meta = {
+	tags: ['notifications', 'account'],
+
+	requireCredential: true as const,
+
+	kind: 'write:notifications',
+
+	params: {
+		notificationId: {
+			validator: $.type(ID),
+		},
+	},
+
+	errors: {
+		noSuchNotification: {
+			message: 'No such notification.',
+			code: 'NO_SUCH_NOTIFICATION',
+			id: 'efa929d5-05b5-47d1-beec-e6a4dbed011e'
+		},
+	},
+};
+
+export default define(meta, async (ps, user) => {
+	const notification = await Notifications.findOne({
+		notifieeId: user.id,
+		id: ps.notificationId,
+	});
+
+	if (notification == null) {
+		throw new ApiError(meta.errors.noSuchNotification);
+	}
+
+	readNotification(user.id, [notification.id]);
+});