Script that displays prices for XMR->BTC

xmr2btc-prices.py

import sys
import json
import urllib2

def jsonApiCall(url):
   try:
      req = urllib2.Request(url, headers={'User-Agent' : "Magic Browser"})
      con = urllib2.urlopen(req)
      data = json.load(con)
   except Exception as e:
      sys.stderr.write("Failed in API call " + url + "\n")
      sys.stderr.write(str(e))
      sys.exit(1)
   return data

poloniex = float(jsonApiCall('https://poloniex.com/public?command=returnTicker')['BTC_XMR']['highestBid'])
poloniex *= 0.998 # 0.2% fee
xmrto = float(jsonApiCall('https://xmr.to/api/v1/xmr2btc/order_parameter_query')['price'])
shapeshift = float(jsonApiCall('https://shapeshift.io/rate/xmr_btc')['rate'])
# shapeshift applies a 0.0001 btc fee per transaction, which we won't factor in here 

print
print "-----------------------------------"
print " Price for buying 1 XMR"
print "-----------------------------------"
print " Poloniex         %10.8f BTC" % poloniex
print " XMR.TO           %10.8f BTC" % xmrto
print " shapeshift       %10.8f BTC" % shapeshift
print