Yo dawg I heard you like APIs so I put an API in your API so you can API while you API

src/Extend/Api.php

@@ -0,0 +1,35 @@
+<?php namespace Flarum\Extend;
+
+use Illuminate\Contracts\Container\Container;
+
+class Api implements ExtenderInterface
+{
+    protected $routes = [];
+
+    public function route($method, $url, $name, $action)
+    {
+        $this->routes[] = compact('method', 'url', 'name', 'action');
+
+        return $this;
+    }
+
+    public function extend(Container $container)
+    {
+        if ($container->make('type') !== 'api') {
+            return;
+        }
+
+        if (count($this->routes)) {
+            $routes = $container->make('flarum.api.routes');
+
+            foreach ($this->routes as $route) {
+                $method = $route['method'];
+                $routes->$method($route['url'], $route['name'], function (ServerRequestInterface $httpRequest, $routeParams) use ($container, $route) {
+                    $action = $container->make($route['action']);
+
+                    return $action->handle($httpRequest, $routeParams);
+                });
+            }
+        }
+    }
+}