Proxima Soft is the default font
In a Sharetribe marketplace, the text is displayed using, by default, the Proxima Soft font. It is used in different styles and sizes.
Here are more details about that font.
Source Sans Pro and Helvetica as backups
If for some reason, Proxima Soft couldn't be loaded, Source Sans Pro is the fallback font (except Custom Landing Page, new Top bar, and new Admin panel). You can learn more about this font here.
If for some reason, Source Sans Pro couldn't be loaded, Helvetica is the fallback font. Helvetica is one of the most famous fonts and even has its own Wikipedia page.
How to change the font in a Sharetribe marketplace
If you want to, you can change the font used using your own Custom Script. This requires some technical knowledge, though. Sharetribe doesn't offer any support on how to make that change.