The aim of the present study is to reconstruct and validate the value co-creation model in the co-contextual ecosystem of the sharing-gig economy, given that the convergence of the two realms of the sharing economy and the gig economy has placed in-depth analysis of value co-creation in a strategic position at the forefront of research, and despite the proliferation of this phenomenon, a comprehensive and localized model of co-created values has yet to be presented. In the emerging paradigm of the sharing-gig economy, value co-creation is the synergistic value generation of co-creators in the digital platform ecosystem. This study has been conducted with a mixed-methods approach of the sequential exploratory type. In the qualitative phase, through content analysis of 15 expert interviews, the three dimensions of "platform participation" and the seven dimensions of "value co-creation" were identified and conceptualized. In the quantitative phase, through a survey of 385 users with multi-stage cluster random sampling and structural equation modeling using AMOS, the impact of "platform participation" on "value co-creation" was tested. The findings revealed that platform participation has a direct, positive, and very strong effect on all seven dimensions of value co-creation; the highest effect coefficients were observed in the social, warm glow, and environmental value dimensions, and economic value ranked the lowest. The predominance of non-material values over material values in users' preference systems and a paradigmatic shift in their attitudes constitute a result of the research in the sharing-gig economy ecosystem. The findings, while presenting a localized model of value co-creation, illuminate a path toward the reconstruction of a culture of mutual assistance, and call for the redesign of platform strategies grounded in social capital, altruism, and environmental responsibility.