Is there a website or application which compares price differences across exchanges in real time?
For example 2 weeks ago we saw BCD hundreds of dollars higher on Bittrex or Kucoin (not sure which exchange it was) than it was on Binance leading to a massive increase in price over a day or so on Binance. Could have easily made some quick bucks if you were one of the first to realise.
So does anyone know of anything like this?
You can try to look at price comparison in coinmarketcap, but I think in coinmarketcap is less effective because you have to check it manually, if you want to do arbitration I suggest to pick a less popular coin, I've seen price differences between exchangers exceed 100% , but if you choose popular coins usually the price difference is just a little, usually some exchangers will close the deposit and withdraw when the price of the coin has a high price difference with other exchangers.