Request in controller constructor Laravel 5.5

I'm really desperate. I'm migrating a laravel project from 5.2 to 5.5 and it's all going to perfection. But I'm having problem to use a Request object in controller constructor. It seems that the controllers skip the middleware if I use Request object. I tried to use $this->middleware('api'); but not working.

public function __construct(Request $req) {
    $this->lablacoCommerce = new LablacoCommerce($req->user->currency()->currency);
}

The api routes are correctly set and the other controllers working!

What have I forgotten?

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