Submitting a funding manifest here makes it publicly discoverable on the directory. It also creates an application for a FLOSS/Fund grant. See FAQs.
A funding.json manifest is a JSON file that describes the funding requirements and financial needs of a project. See fundingjson.org.
It can be hosted on a project's or organisation's website, or a repository such as https://github.com/user/project/blob/main/funding.json