The adoption of electric vehicles (EVs) is a process faced with several challenges, such as the limited availability and accessibility of charging infrastructures. To address these issues, stakeholders in the field of EV charging have developed “EV roaming” or “eRoaming,” which grants EV owners access to charging points operated by various charging point operators (CPOs) through a single contract. However, this development is still in its early phase as the current charging systems employ centralized platforms that deploy different protocols in their charging stations, which has now resulted in fragmentation and limited accessibility of charging infrastructure for EV owners. Moreover, current approaches typically raise concerns of market power autonomy. Additionally, studies that explore requirements and barriers related to decentralized eRoaming are limited because the concept is still evolving in several countries. Thus, there is a need to investigate the number of stakeholders required to achieve decentralized eRoaming. To address these issues, this article aims to develop a business service ecosystem for decentralized eRoaming services to support an interoperable and standardized use of public and private charging infrastructures. The findings from this study will provide knowledge on how to design new business models, how to avoid unnecessary barriers, and on cross-regional eRoaming in energy communities.