This study aims to bridge existing research gaps and bring to light a better understanding of the potential risks and opportunities associated with the introduction of plastic credit schemes to the informal sector. The research incorporates the three dimensions of sustainability; social, ecological, and economic aspects of regional MSWM systems and the impact that plastic credit schemes as a new financing approach could have on them. As an outcome, the study delivers key insights and recommendations for different stakeholders involved in the development, implementation, or regulation of plastic credit schemes. The study has a regional focus on South-East Asia, with a specific focus on Malaysia, Thailand, Indonesia, the Philippines, Cambodia, and Vietnam. As means of data collection, the authors conducted a total of 40 semi-standardised guideline interviews. These include independent academic experts as well as a variety of different stakeholders involved either in the development and implementation of plastic credit schemes (such as marketplaces or standard setters) or in plastic waste management activities closely related to the informal sector (such as informal waste worker associations, local NGOs, or international development organisations).