Mt. Gox allows you to trade US Dollars (USD) for Bitcoins (BTC) or Bitcoins for US Dollars.

gem install mtgox

To ensure the code you're installing hasn't been tampered with, it's recommended that you verify the signature. To do this, you need to add my public key as a trusted certificate (you only need to do this once):

gem cert --add <(curl -Ls https://gist.github.com/sferik/4701180/raw/public_cert.pem)

Then, install the gem with the high security trust policy:

gem install mtgox -P HighSecurity

After installing the gem, you can get the current price for 1 BTC in USD by typing btc in your bash shell:

$ btc
50.00

http://rdoc.info/gems/mtgox

require 'rubygems'
require 'mtgox'

# Fetch the latest price for 1 BTC in USD
puts MtGox.ticker.sell

# Fetch open asks
puts MtGox.asks

# Fetch open bids
puts MtGox.bids

# Fetch the last 48 hours worth of trades (takes a minute)
puts MtGox.trades

# Certain methods require authentication
MtGox.configure do |config|
  config.key = YOUR_MTGOX_KEY
  config.secret = YOUR_MTGOX_SECRET
end

# Fetch your current balance
puts MtGox.balance

# Place a limit order to buy one bitcoin for $0.011
MtGox.buy! 1.0, 0.011

# Place a limit order to sell one bitcoin for $100
MtGox.sell! 1.0, 100.0

# Place a market order to sell one bitcoin
MtGox.sell! 1.0, :market

# Cancel order #1234567890
MtGox.cancel 1234567890

# Withdraw 1 BTC from your account
MtGox.withdraw! 1.0, "1KxSo9bGBfPVFEtWNLpnUK1bfLNNT4q31L"

In the spirit of free software, everyone is encouraged to help improve this project.

Here are some ways you can contribute:

• by using alpha, beta, and prerelease versions
• by reporting bugs
• by suggesting new features
• by writing or editing documentation
• by writing specifications
• by writing code (no patch is too small: fix typos, add comments, clean up inconsistent whitespace)
• by refactoring code
• by closing issues
• by reviewing patches

This library aims to support and is tested against the following Ruby implementations:

• Ruby 1.9.2
• Ruby 1.9.3
• Ruby 2.0.0

If something doesn't work on one of these interpreters, it's a bug.

This library may inadvertently work (or seem to work) on other Ruby implementations, however support will only be provided for the versions listed above.

If you would like this library to support another Ruby version, you may volunteer to be a maintainer. Being a maintainer entails making sure all tests run and pass on that implementation. When something breaks on your implementation, you will be responsible for providing patches in a timely fashion. If critical issues for a particular implementation exist at the time of a major release, support for that Ruby version may be dropped.

Copyright (c) 2011-2013 Erik Michaels-Ober. See LICENSE for details.