APC data is now available for over 12,000 journals with longitudinal data going back to 2010 for selected journals.
Summary description of the dataset from the documentation article (from the 2017 data documentation preprint)
This dataset includes information on open access journals derived from publisher websites and the Directory of Open Access Journals (DOAJ), developed as the base for a longitudinal study on the open access article processing charges (APC) method used by about a third of open access journals. In the APC business model, a payment is made, by an author, institution, or funding agency, for publishing an article so that the article can be freely available to everyone (open access). This dataset also includes 2015 APC data provided by Crawford , 2010 APC data provided by Solomon and Björk , a smaller set of pilot project data collected by the research team in 2013, and a fuller set of data collected on APCs by the research team in 2014 and 2015, as well as additional data relating to APC sub-model (e.g., variations in pricing, page versus article charges), analysis of publisher type, and a custom subject analysis. To date, these data were used as the basis for a 2014 DOAJ APC survey . This project received funding from Canada’s Social Sciences and Humanities Research Council under the Insight Development Grant program for 2014–2016 and is currently funded under an Insight Grant for 2016 – 2021. At present, there is keen interest from research funders, libraries, scholars, and publishers on the economics of transition to open access. This dataset will facilitate and speed up the work of other researchers, and this document describing the data is necessary to understand and analyse the data.
The 2016 dataset is now available for download here: http://dx.doi.org/10.5683/SP/KC2NBV