From their site: Use Gastus to keep track of your daily expenses. When you're using the API, it's always through an existing user in Gastus. So when you use the API as "john", you get to see and work with what "john" is allowed to do. Pretty much any URL in Gastus can be viewed in its XML form by adding the .xml extension. So /expenses/4 becomes /expenses/4.xml. You can view, create, update, and delete resources through the API.
Click the "Track this API" button on any profile page and never miss an API update, new app, or breaking news for that API again.
There are no mashups, developers or code associated with this API yet.
No comments on this API yet...Used it? How was it for you?