This Call to Action is the result of a roundtable workshop co-organized by the Barcelona Declaration Working Group on Funding Metadata and Crossref to discuss the challenges and opportunities for improving open funding metadata. Representatives from different stakeholder groups, including funders, publishers, and infrastructure providers, came together for a candid discussion about current barriers and opportunities for joint solutions. Improving the quality of open funding metadata requires improving how this information is captured, structured, and shared across the scholarly communication ecosystem.The Call to Action presents a concise summary outlining the importance of funding metadata, the key barriers affecting its quality and coverage, and a set of recommendations for stakeholders across the scholarly communication ecosystem: publishers, funders, institutions / libraries and infrastructure providers. Accompanying the Call to Action is a background document presenting more detailed insights, and proposed actions for improving open funding metadata, available at https://doi.org/10.5281/zenodo.2018999.