We study exchange-rate pass-through and currency choice in international transactions, focusing on bilateral bargaining power in relationships between domestic buyers and foreign suppliers. Using detailed transaction-level data on Swiss imports from 2014?2023 identifying buyers and suppliers, we show that exchange-rate pass-through is lower for economically important suppliers within a buyer’s network. This pattern is explained by a higher likelihood of invoicing in the buyer’s currency, consistent with a bilateral bargaining model of price setting and endogenous currency choice. Our results imply that bilateral bargaining power shapes how foreign shocks affect prices and external adjustment, making policy transmission network-dependent.