Normally when you get mugged in the street you are fully aware of what is happening. But with arbitragecoins.com its far more subtle. This site is an elaborate scam which describes arbitrage opportunities between different crypto exchanges. Because its an imperfect market, prices for each coin can vary from exchange to exchange. This site proposes to run software to identify opportunities because of the gap. So good so far. But this site is nothing more than a scam which takes your coins and thats the last you see of them.
So avoid arbitragecoins.com, its a plain old fashioned scam.