Recognising the value of forests and other tropical ecosystems, some governments, companies and investors have made ambitious commitments to achieve deforestation-free supply chains. But the complexity and opacity of supply chains are major barriers to delivering on these – if the buyers don't know where their supply chains start or end, who is involved in them, or whether they are exposed to risks as a result, how can they take action to ensure they are sustainable? Trase addresses this problem, using publicly available data to map the links between consumer countries via trading companies to the places of production in unprecedented detail. Trase can show how commodity exports are linked to agricultural conditions in the places where they are produced, allowing companies, governments and others to understand the risks and identify opportunities for more sustainable production. Trase provides data at scale, free-of-charge, comprehensively mapping supply chains for key commodities.