SourceMedium is an e-commerce analytics platform that builds a single source of truth for brands on BigQuery. It centralizes data from storefronts, ad platforms, subscriptions, analytics, and support tools into standardized models and 180+ documented metrics. Teams get stable definitions, daily QA checks, and prebuilt dashboards for acquisition, retention, and marketing performance, plus a verifiable AI Analyst that answers questions in Slack with the underlying SQL. SourceMedium manages the data stack end to end while brands keep ownership of their warehouse, tables, and dashboards, eliminating vendor lock-in and giving operators trusted numbers to make faster decisions for the entire team.