Currently, individual publishers, librarians, scholarly publishing platforms and services encounter challenges when collecting the OA book usage data to make strategic decisions about their OA publishing and OA programs. Staff time and expertise is required to normalize and aggregate these impact metrics from numerous platforms. Without such high-quality, reliable data available, organizations cannot be fully aware of the context-specific impacts related to a given author, collection, institution or platform. Additionally, smaller organizations often lack the resources to process incoming usage data and benefit from such OA impact analytics. To address this disparity, stakeholders have been advancing the Open Access Book Usage Data Trust effort (OAeBUDT) with support from the Mellon Foundation. This international network is working towards exchanging reliable usage data in a trusted, equitable, and community-governed way. By 2025, the effort aims to foster the secure, multi-party exchange, aggregation and benchmarking of book usage related data; increase trust in usage metrics; improve data quality; and reduce OA reporting and compliance resource-burdens. In 2023, the project is developing ethical data use guidelines to inform OA book usage data sharing agreements and technical requirements for data exchange between public and commercial OA book usage data creators. This poster will provide background to the OAeBUDT effort, summarizing key research findings to date while providing a preview of the emerging ethical data exchange and use guidelines. QR codes will be available for individuals to participate in open community consultations and download resources for later reference.