https://www.myfonts.com/collections/mixcase-font-roman-melikhov

Mixcase font family is suitable for creating logos, wordmarks, titles, taglines. The properties of uppercase letters, numbers, punctuation and extra characters in Mixcase Mixed font are the same as those of lowercase letters, which allows to combine letters of both cases in different ways. All characters in Mixcase Unmixed font have normal ratios, so it can be used as typesetting font. The combination of both fonts provides additional use cases in the form of small caps and mixed small caps.