An overview and a quick dive into the transparency of publication fees (APCs). About 100 viewers attended the webinar on March 25, 2019. The event consisted of two presentations:  First, Christoph Broschinski gave an introduction to the OpenAPC initiative ( https://intact-project.org/openapc/ ). Since June 2014, this initiative, supported by the DINI working group on electronic publishing and subject of the projects INTACT and continued now in KOA, collects and disseminates datasets on APC ...