function getPrices(articles) {
            return $http.get('http://someurl/api/prices/getprices', { params: { articles: articles } }).then(function (res) {
                   // do something with prices
                }, function (err) {
                    // handle error
                });
      }

var oneArticle = {
  code: 'someCode',
  quantity: 1,
  stockUnit: 'piece'
}

[VersionedRoute("getprices")]
[HttpGet]
public IHttpActionResult GetPrices([FromUri]List<Article> articles) {
 // do something with input
}

public class Article {
  public string Code {get;set;}
  public int Quantity {get;set;}
  public string StockUnit {get;set;}
}