WP-API get posts and order them by a descending order

I am trying to grab posts and order them by date, in a descending order.

I am talking about this API: https://github.com/WP-API/WP-API

I tried:

http://url.com/json/wp-json/wp/v2/posts?filter[order]=DESC

http://url.com/json/wp-json/wp/v2/posts?order=desc

Neither of them work.

But this, for example, works fine:

http://url.com/json/wp-json/wp/v2/posts?filter[cat]=3

Any idea?