One slightly left-field suggestion...

Change the up/down icons to something that communicates the category of payment. A zap, or a podcast payment, or a purchase, etc.

You're already communicating whether it's an increase or decrease with the colour of the sats amount on the right hand side, so you don't need additional cues on the left. You could add a visual cue with a subtle background colour to that entry as well.

My (fancy online) bank does something similar. 

 We don’t know what payment it was for bolt11 payments so we can’t add categories there