Welcome to Unpaywall | Unpaywall

Can Unpaywall Data tell me whether an article is “Green," “Gold," or “Bronze" OA?We don’t include the “OA Color" explicitly in the data schema, because we found that people’s definitions of the colors vary pretty widely, and so it was causing confusion. Instead, we include all the data you’ll need to decide the color based on your own definitions, whatever they may be. In particular, you’ll probably want to look at the is_oa and journal_is_oa fields of the DOI Object, as well as the license and host_type fields of Location Objects. See the schema documentation for more details.

Source: Welcome to Unpaywall | Unpaywall