What types of costs relating to the publication of books are covered by the SNSF within the framework of its OA policy?

The SNSF finances the publication of scientific books (monographs and anthologies) that are published via the Gold Road. It is possible to apply for a grant covering the book processing charges (BPCs) of books resulting from a project funded by the SNSF as well as books with no link to an SNSF project. The application has to be submitted via mySNF.
For monographs and anthologies, the SNSF awards a book processing charge (BPC) that covers the costs of publishing services with regard to quality control, book production and distribution. The maximum amounts of the different BPC modules are specified in Article 11 of the Regulations on the funding of Open Access publications.

Open Access book publications – Open Access (snf.ch)