then just run it and browse to http://127.0.0.1:7778/?method
you can use the gui to find the URL you need for an operation, then add /json to get just the json and not the entire webpage. alternatively a POST (ie via curl --data) with the JSON request will just return json
http://127.0.0.1:7778/ramchain/block/height/0 -> full webpage
http://127.0.0.1:7778/json/ramchain/block/height/0 -> JSON only
the superugly GUI is not stateless, there is a default coin that is used for any coin based API.