For commercial use, an author must pay for a license but there are opportunities to get it for free such as Badaboom BB by Blambot, one of the most popular free fonts for personal use that has symbols more often used in lower case and in upper index. A downside of the free version is that while there are all lowercase letters, there are also some additional letters.
You can use this font for personal purpose.
Badaboom BB Font Free Download
License: Personal Use Only!
Font Type: Free
Format: OTF, TTF
File Size: 9 KB
Total Files: 1
Why no lowercase letters?