I have a working program which gets order book data from Bittrex api for any contract. That can be modified to suit your requirements(display and logic for alerts). Example of BTC-ETH order book few minutes ago extracted via the API.
I am a certified bitcoin professional and experienced algorithm developer.
Contract,BuySell,Quantity,Rate
BTC-ETH,Buy,2.30443482,0.07006576
BTC-ETH,Buy,114.27087013,0.07002502
BTC-ETH,Buy,1.21009432,0.070025
BTC-ETH,Buy,28.49360522,0.07001571
BTC-ETH,Buy,28.91468119,0.07001561
BTC-ETH,Buy,0.72343502,0.07001559
BTC-ETH,Buy,0.5890921,0.0700137
BTC-ETH,Buy,0.44949438,0.07001351
BTC-ETH,Buy,0.43253207,0.07001295
BTC-ETH,Buy,28.49593729,0.07000998
BTC-ETH,Sell,31.15477672,0.07019981
BTC-ETH,Sell,7.28731313,0.07019982
BTC-ETH,Sell,0.00987478,0.07019988
BTC-ETH,Sell,6.5,0.07020009
BTC-ETH,Sell,0.22028013,0.07021434
BTC-ETH,Sell,1.61534753,0.070277
BTC-ETH,Sell,9.995,0.07027745
BTC-ETH,Sell,0.1,0.0702776
BTC-ETH,Sell,48.2021,0.07027769
BTC-ETH,Sell,0.31375721,0.0702777