“His name, Socrates, is Evenus, he comes from Paros, [c] and his fee isfive minas.”
Callias, son of Hipponicus recommends Evenus of Paros to Socrates as a Sophist teacher whose fee is five minas.
Compare this five minas to the price Socrates mentions at the end of the trial as potential penalty. Socrates says he can afford one mina while his friends could put up 30 minas for him.