How much does it cost to create a DeX?

I'm curious to know, what kind of financial investment is typically required to establish a Decentralized Exchange, or DeX, in the world of cryptocurrency? Are there any upfront costs that need to be considered, or are there ongoing expenses that need to be accounted for in order to maintain the operation of such a platform? I'm eager to gain a better understanding of the budgetary requirements associated with setting up a DeX, so I can make an informed decision on whether or not it's a viable option for my project.