Today, cryptocurrencies are primarily traded on centralized exchanges where user funds are at risk to hackers and platform managers. Decentralized exchanges (DEXs) allow users to retain control of their funds as trades are mediated by smart contracts on a blockchain. Unfortunately, today’s DEXs are slow, hard to use, and are restricted to trades on a single blockchain. Neon Exchange (NEX) is a new decentralized exchange that solves these problems, leveraging a high performance off-chain matching engine built with Elixir to handle massive order volume, allow cross-chain exchange, and support more complex trading APIs. Many people do not use DEXs because they cannot trade with their national currencies. NEX is the first DEX that will allow its clients to enter the exchange with fiat currencies such as USD, powered by a global network of licensed third parties.