Get it here.
I use this to create check-ins independent form Foursquare. Of course this method is not as fully featured but I created a category to collect my check-ins.
The current version is just some text and a markdown link you can paste into a new post in the Micro.blog app or Sunlit.
Sending coordinates via the Micropub protocol is natively supported by Micro.blog’s API. The next version will hopefully be able to post location data directly to the API. Let’s hope I don’t have to write an app for that 😅.