You can check out the journal here: it’s diamond open access journal :-)
Here’s the description of the journal from their website:
The Journal of Mathematical Philosophy (JMP) is an open access journal publishing research in all areas of mathematical philosophy, broadly understood. It grew out of a concern that open access publishing is still difficult for many authors and institutions due to high article processing charges. JMP aims to contribute to a solution for this problem. It is free to read and free to publish in: there are no subscription fees for readers and no article processing charges for authors.
The journal operates double-anonymous peer review and uses the LaTeX-based workflow described in our submission guidelines. Articles are published continuously as they are accepted.
We aim for a fast submission pipeline. New submissions are sent to review or desk rejected quickly, typically within three weeks. Submission are quickly published after acceptance.