This deliverable presents the final version of the VeriFish Knowledge Base (KB), developed under Task T2.3, as well as its associated API and access services, which constitute the final demonstrator supporting the VeriFish Indicator Framework. The KB enables unified, verifiable access to environmental, socio-economic, and nutrition and health data, allowing users to explore, query, and retrieve indicator-related information through the VeriFish web application. Building upon the initial KB version, which was based on the Global Record of Stocks and Fisheries (GRSF), the final version is significantly extended both in terms of its scope and coverage. The VeriFish KB integrates an expanded set of 22 distinct authoritative data sources both at European and global levels, strengthening the representation of all sustainability dimensions addressed by the VeriFish framework. VeriFish KB integrates these datasets and assumes their reliability based on the credibility and established practices of the source organizations curating them. In parallel, the services for discovering and accessing KB resources have been further developed, offering enhanced querying capabilities and improved usability.Given the complexity of the demonstrator and its underlying data integration and semantic modeling processes, this deliverable is accompanied by the current report that documents the structure, functionality, and usage of the KB and its API. This documentation is necessary to support transparency, reproducibility, and effective use by stakeholders. In addition, updates to the VeriFish Indicator Framework are reported, including refinements to existing indicators and their explicit alignment with the underlying data sources. These updates are directly operationalised within the KB and are therefore essential for understanding how indicator values are derived and accessed through the demonstrator. The KB enables the integration and combined analysis of heterogeneous datasets within a single system, supporting the computation and comparison of sustainability indicators in a way that is not possible when using these sources in isolation.