FTX bad boy Sam Bankman-Fried’s cushy house arrest was brightened up Tuesday by a visit from a sexy single crypto influencer who said he seemed “surprisingly optimistic” ahead of his trial on multiple fraud charges, The Post has learned.

Sources said Tiffany Fong stayed late into the night during her trip to see the accused fraudster — currently holed up at his mom and dad’s house in Stanford, Calif. — who has been federally charged in what is shaping up to be one of the biggest financial scandals in history.