["Psychology &Marketing, EarlyView. ", "\nABSTRACT\nLoneliness is a pervasive public health concern, yet the efficacy of emerging commercial interventions remains understudied. Paid companionship service—transactional, stranger‐based encounters designed to provide connection—represents a novel market response, but their psychological impact is less understood. We conceptualized this emerging service as a market‐mediated relational exchange, a unique service logic that leverages transactional efficiency to deliver the high‐intensity relational value. This research employed a mixed‐methods design to investigate the psychological pathways through which this service operates. A qualitative study (Study 1) first explored consumers' lived experiences with commercialized interactions, uncovering a spectrum of potential mechanisms and contextual contingencies. Among these, the mediating role of state social connection and the moderating influence of social presence emerged as the most empirically pivotal and theoretically robust pathways for loneliness reduction. Subsequently, two experiments (Study 2) rigorously tested the hypothesized mechanisms. Results demonstrated that paid companionship significantly reduced immediate feelings of loneliness compared to control conditions. This effect was statistically mediated by an enhanced sense of state social connection. The service's efficacy was, however, context‐dependent: the presence of an out‐group audience (a form of social presence) moderated the effect, amplifying the reduction in loneliness. Our findings also highlighted its potential long‐term challenges driven by consumers' boundary work to navigate between market and social logics, including the risks of emotional dependency and diminishing marginal utility over time. This research provided the first empirical evidence for the psychological efficacy of paid companionship, detailing both its immediate restorative benefits and its contextual and temporal limitations.\n"]