I just found some interesting post so i just test it works like charm

https://www.reddit.com/r/btc/comments/415l41/market_volatility_and_arbitrage_possibilities_at/

Calculation for making almost $1000 with this arbitrage possibility.

* Buying 30 btc at [Coinbase] https://www.coinbase.com/ (current price: $361)
* Selling 30 btc at [Bitcoin Magnet] https://www.bitcoinmag.net/ (current price: $394)
* Total profit: $990 (fees not calculated)

are there any proofs that this works?