VeriDex is a decentralized exchange launched in the year 2019 in Brazil, although I have no experience based idea of it but from researches on it, I know it runs a 0x smart contract. As far as I'm concerned, VeriDex is no longer available and not functioning anymore. By hearing this I know that you will be thinking that it is a scam but that's not it.
VeriDex has been re-registered as Verisafe and has been working very efficiently, it is an open source decentralized exchange also. By my view of its interface, it rate it as a very attractive one. Moreover, it has a very good number of social media sites and also a very good number of followers, it also supports a good range of cryptocurrency tokens for trade and also hosts airdrops.
Finally, I must confess that the development team behind this exchange must be an intelligent set of experts in crypto and I recommend it, but if you still doubt it, you can just check it out for your self.