I am looking into whether it is possible to create an in game addon that would get data from the game database which is online. (nothing saved in your computer)

The game source code is not provided.

So is it possible - and if yes how much would it approximately cost?

My intention is not to hack the game's database other than interact with it with queries that would enchance my gameplay.

looking into some expert's point of view and apologies if the question is ignorant