Hello,
The user’s balance is displayed by [wallets_balance] shortcode. To display the entire wallet balance of the site you would need to use PHP. First get a hold of the coin adapter with the adapters API and then call get_balance() on it.
The plugin is not currently suitable for fundraisers but this is a good idea for the future. One idea would be to use the Tip the Author extension, create a post and then users will be able to tip the author of that post. You can control which posts can be tipped by filtering with categories or tags, so you can have one post per fundraiser if you like.
Then users will be able to see a list of people who have donated to that post.
Hope this helps.