You should be able to create large orders using Binance[1][2].
It all depends on the coins you're going to use though. I've converted some of the values (found on the first link) to USD and apparently, they're not all the same.
Code:
11823 ETH = ~2 Million USD 280593 NEO = ~2.1M USD 297315 WTC = ~250,000 USD etc.
Thx, for the answer. Binance is ok but I would love to find a decentralized solution for my project. I am only trading a handful of coins, will look into it.