RusBunker is an electronic trading system that facilitates direct transactions between ship owners and fuel suppliers for bunkering services. The system allows ship owners to create tender applications to request fuel prices, with the tenders conducted as Dutch auctions on the platform. Fuel suppliers can then participate in the tenders by submitting competitive price bids. The goal of the system is to increase transparency and competition in the bunkering market to provide better prices for ship owners and business opportunities for fuel suppliers.