Quickly shows the most reasonable USD lowest asker and highest bidder from bitcoincharts.com

btc_bid_ask.rb

#!/usr/bin/env ruby
require "open-uri"
require "json"
#get the data
j = JSON.parse open("http://bitcoincharts.com/t/markets.json").read
#only USD, only active exchanges, and only where there's a bid and ask
j.select! {|x| x["currency"] == "USD" and x["volume"] > 0 and !x["ask"].nil? and !x["bid"].nil?}
#sort, need lowest ask and highest bidder
ask = j.sort {|x,y| x["ask"] <=> y["ask"]}
bid = j.sort {|x,y| x["bid"] <=> y["bid"]}

puts "highest bidder:"
puts bid.last

puts "lowest seller:"
puts ask.first

puts "spread opportunity:"
puts spread = bid.last["bid"] - ask.first["ask"]
puts p = spread / bid.last["bid"] * 100

puts "worth it! buy at #{ask.first["symbol"]}, sell at #{bid.last["symbol"]}" if p >= 6
puts "not worth it" if p < 6

2.times { puts "" }

gox = j.select {|x| x["symbol"] == "mtgoxUSD"}
cbx = j.select {|x| x["symbol"] == "cbxUSD"}

puts "cbx ask:"
puts a = cbx.first["ask"]

puts "gox bid:"
puts b = gox.first["bid"]

puts "diff:"
puts s = (b-a)/b*100

puts "buy at cbx and sell at gox?"
if s > 6
  puts "yes"
else
  puts "no"
end

2.times { puts "" }

puts "gox ask:"
puts a = gox.first["ask"]

puts "cbx bid:"
puts b = cbx.first["bid"]

puts "diff:"
puts s = (b-a)/b*100

puts "buy at gox and sell at cbx?"
if s > 6
  puts "yes"
else
  puts "no"
end