The prices are determined by the market, not by GOPACS. A match via GOPACS results in a match that probably would not have taken place otherwise, because the grid operator pays the spread between two orders. Both market parties involved receive or pay the amount of the order they have placed. This amount is paid via the market platform. Grid operators only use orders if these come with the proper location data and if these contribute to solving congestion in the electricity grid cost-efficiently. An order can only be used for preventing congestion if it comes with the location data.