We made an extension for encpass.sh (similar in some ways to pass) that stores secrets in Keybase (https://github.com/plyint/encpass.sh/blob/master/extensions/...) if that sort of thing is of interest to you. Outside of personal secrets, it can be used as a sort of low cost stand in for shared secrets that you might use something like Vault for in a team environment.
That's interesting. I started storing my dotfiles repository in Keybase. There's not any secrets in there really other than how my home directory is setup but I figured there's no reason I couldn't keep my AWS keys and ssh key pairs in there too.