ESAC aggregates data and relevant facts for the open access market in general and a number of major publishers in particular in order to illustrate and better assess the development of the scholarly publishing market as it transitions to open access.

ESAC aims to provide context and share information with the broader community on the progress of transitional license models such as “Offsetting” and “Read & Publish,” to increase the understanding of their scope and transformative power. In particular, we collect and share information on the uptake of transformative agreements around world, their transformative mechanisms and cost allocation schemes, the impact achieved in terms of open access, and the relevant workflows.

The ESAC Initiative – standing for Efficiency and Standards for Article Charges – was originally established in 2014 to keep up the discussion around the need to develop workflow efficiencies in the management of open access article processing charges, following an international workshop in 2013 and organized by the Max Planck Digital Library in cooperation with the German Research Foundation (DFG), PLOS and Co-Action Publishing.

In November 2015, ESAC moved under the roof of the DFG funded project INTACT, together with OpenAPC and OAanalytics, with the aim of building infrastructure that would ensure the open access publishing market based on the APC-based business model would remain transparent and sustainable. While the INTACT project officially ended in October 2018, ESAC continues at the Max Planck Digital Library with the collaboration of an international network of partners and supporters.


ESAC’s collaborators and supporters

With its collaborative approach, ESAC relies on contributions from its partners, library consortia and research organizations from around the world.

Send us an email and learn more about how to get involved.



Max Planck Digital Library | contact [at] esac-initiative [dot] org