The repositories MTBLS, NMDR, and GNPS/MassIVE made different design choices for metadata. Metadata for MTBLS is standardized to the 'Investigation', 'Study', and 'Assay' (ISA) model, similar to Sequence Read Archive (SRA) for sequencing, with controlled vocabularies/ontologies annotations where possible. NMDR based their metadata workflow on the Metabolomics Standard Initiative recommendations with a text-based format called 'mwTab' which is similar in principle to UniProt. GNPS metadata submissions were optional and encouraged the use of the controlled vocabulary defined in the ReDU framework . This heterogeneity of metadata makes the discovery of relevant raw data across repositories difficult. ontologies. Each data file is associated with a unique MS Run Identifier (MRI), which can be used to download data from a selection of more than 600K raw files or transfer them to different online or offline services. Users can find data files via metadata categories (e.g., Homo sapiens, and blood plasma) or dataset IDs. Fragmentation spectra (MS/MS or MS2) can be searched against public data (currently GNPS only) to retrieve metadata categories with matching scans. This work lays the foundation for making this available for all public repositories. Notably, no programming skills are required for standard users.