Just wondering if anyone knows a site or app that shows the differences between the current sale price for bitcoins on various exchanges?
So far i've come across bitcoincharts.com, http://btc-alert.appspot.com
, and the Chrome extension Bitcoin Ticker.
Bitcoin Ticker just shows current USD market values, btc-alert just alerts you when MtGox' price goes above/below a certain value, and bitcoincharts from what i can see just shows values over time rather than giving you the current value at each exchange.
Ideally there would be a tool that alerted you when the price _difference_ between two exchanges goes beyond a given threshold, but if anyone knows of something that simply lists the differences that would be great.
There's got to be unix scripts that can read this data, right?