There are many components that go into creating a marketplace. The price will depend on the company you choose to develop your marketplace. You can write to them directly and ask them what they would charge for developing your marketplace.

Yeah, anyone, that's the calculation. Players have an interesting time (if the game is really good) and get cryptocurrency or nft, and the developers get the power of the device the player owns and earn from advertising. You just need to take the time and choose a game you like and, if possible, start playing it as early as possible. I still stopped at monsta infinite, and then we'll see.