The E-RIHS Catalogue of Services (CoS), available at https://catalogue.e-rihs.eu/, offers a simplified, interoperable, and FAIR-aligned platform for accessing and managing E-RIHS services. Building on earlier E-RIHS-related efforts within EU projects, the current version represents an advancement of the previous experiences, integrating innovative features aligned with the latest interoperability standards and enhanced user experience. The CoS operates as a stand-alone web platform, featuring a user-friendly frontend for service discovery, selection, and proposal submission, alongside a robust backend for proposal management, Key Performance Indicators monitoring, and data handling. Its core components include dynamic service descriptions, a sophisticated filtering and search system, and a detailed proposal submission workflow that supports co-creation and multi-service access requests. Integration with external platforms such as ORCID and adherence to controlled vocabularies further facilitate seamless user interaction and data consistency. The CoS also includes advanced dashboards tailored for various user roles — researchers, reviewers, and service managers — streamlining processes from proposal submission to access conclusion and post-access duty delivery. Continuous training initiatives, including webinars and digital handbooks, will allow users to engage effectively with the platform while fostering interdisciplinary collaboration and knowledge exchange. Moreover, thanks to the Laravel and Elasticsearch technologies at its base, the platform ensures scalability, efficiency, and precise service recommendations powered by natural language processing. Future developments will leverage semantic and AI technologies to enhance usability, multilingual accessibility, and interoperability, transforming the CoS into an enriched knowledge ecosystem. By integrating cutting-edge technology with a user-focused design, the E-RIHS CoS enhances the heritage science community, fostering accessible, efficient, and collaborative research opportunities across Europe and beyond.