What's your intention to go through all the work to build an exchange for 2 pairs only? 

IDK if it does this, I didnt get a chance to look yet, but is it possible to calculate 3 way arbitrage on a single exchange?  For example compare btc-eth-ltc, and see if any profits can be earned?  Has the advantage that you dont need to send to other exchange ever, but might be more processor heavy and difficult to compute?  IDK just an idea.  Gonna get this app and if I make money definitely gonna donate

cryptopia account nlexch account 10 uis sent me to check if it is scam.
but it did not come for 10 hours
so this site is a stock market in scam.
and although the name on the uis official site is scam.
please do not send your coins to this stock exchange for your security.

Be Careful this APP and so on (sometimes they shows not faithful information)
There are some reason, why arbitrage is not worked.
 Frequently there are  a lot of arbitrage situations between exchanges.
BUT there are some problems:
1. very slow transaction between exchanges.
2. Withdraw or deposit are disabled.
These things make arbitrage not safety business.
https://coinmarketcap.com/currencies/greencoin/#markets

Bump