FundRef is a CrossRef registry that standardizes the reporting of funding sources for published scholarly research. It allows publishers to submit funding information like the funder, grant number, and award number through their submission systems, which gets attached to the associated DOI. This funding metadata can then be queried through CrossRef's database and APIs or on their website. Currently over 44,000 DOIs in the FundRef registry include funding metadata. Publishers can sign up to participate by agreeing to the FundRef terms and conditions, while others can query the freely available information without joining.