How much is ston fi?

Excuse me, could you please clarify what you mean by "ston fi"? I'm not familiar with that specific term in the cryptocurrency or finance world. Are you referring to a particular cryptocurrency, a financial product, or perhaps a typo for a more commonly known term? If you could provide a bit more context or spell out the term more accurately, I'd be happy to help you understand its value or significance in the cryptocurrency and finance landscape.