MapRoulette's graphQL server implements a predominately read-only graphQL schema with a couple of mutations available. This is to serve as a complimentary API to the Restful API that MapRoulette currently uses.
MapRoulette has implemented a Graphiql IDE that can be used to run queries against, you can access this at https://\<HOST>:\<PORT>/graphqlIDE
All graphQL queries should be executed against https://\<HOST>:\<PORT>/graphql
For more information on graphql go to: graphql.org