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?
This website could help you
https://coinalyze.net/Helpful, but it does not compare very many different coins.
Maybe this is what you're looking for (livecoinwatch.com), it has lots of altcoin and price is updated in real time. arbitrage is kinda hard to trade, there are bots that are going to be a lot faster than you. also you'll be needing a lot of money for it to be profitable.