other coins can be added easily, we just need to add more api to support them
But tell me you are not planning to launch your own decentralized exchange? It seems to me that Project SnowGem has many unique developments of its own. You did not think to develop in the direction of creating your own exchange?
What goes wrong if SnowGem uses existing centralized and decentralized exchanges? Creating userbase and generating real volume is not that easy. There is a huge exchange competition now.