This is a fork of a project originally authored by Daniel Silver (https://github.com/dan-silver/coinbase_exchange)

This gem isn't officially endorsed, affiliated, or supported by Coinbase Exchange.

Ruby wrapper for the Coinbase Exchange API

The library wraps the http request and message signing and provides.

The fork adds convenience methods to access all of the API's functionality, and allows for unauthenticated access to Market Data and the WebSocket feed.

Create an account at https://exchange.coinbase.com to get started.

Installation

Include this in your gemfile for latest version from git:

gem 'cbx', :git => 'git://github.com/mikerodrigues/cbx.git'

or from Rubygems, usually not far behind git master:

gem 'cbx'

Example

require "cbx"

# For unauthenticated access:
cbe = CBX.new

# List products
cbe.products
=> [{"id"=>"BTC-USD",
     "base_currency"=>"BTC",
     "quote_currency"=>"USD",
     "base_min_size"=>0.01,
     "base_max_size"=>10000,
     "quote_increment"=>0.01,
     "display_name"=>"BTC/USD"}]

# Get product order book at level 1, 2, or 3, (Defaults to level: 1, product_id "BTC-USD")
cbe.orderbook(1, 'BTC-USD')
=> {"sequence"=>29349454,
    "bids"=>[["285.22000000","0.34800000", 3]], 
    "asks"=>[["285.33000000", "0.28930000", 4]]}

# Product tickers (defaults to 'BTC-USD')
cbe.ticker("BTC-USD")
=> {"trade_id"=>125681,
    "price"=>"226.20000000",
    "size"=>"0.01570000", 
    "time"=>"2015-02-08T04:46:17.352746Z"}

# Product trades (defaults to 'BTC-USD')
cbe.trades('BTC-USD')
=> [{"time"=>"2015-03-15 04:43:48.7943+00"
     "trade_id"=>774500
     "price"=>"285.44000000"
     "size"=>"0.01000000"
     "side"=>"sell"}
    {"time"=>"2015-03-15 04:42:54.432661+00"
     "trade_id"=>774499
     "price"=>"285.47000000"
     "size"=>"0.05340000"
     "side"=>"sell"},
    {"time"=>"2015-03-15 04:42:54.432306+00"
     "trade_id"=>774498
     "price"=>"285.45000000"
     "size"=>"0.09100000"
     "side"=>"sell"}]


# For authenticated access:
cbe = CBX.new API_KEY, API_SECRET, API_PASSPHRASE

# List accounts
cbe.accounts
=> [{"id"=>"000ea663...",
     "currency"=>"USD",
     "balance"=>"90.0000114750000000",
     "hold"=>"0.0000000000000000",
     "available"=>"0.9000114750000000",
     "profile_id"=>"4409df27..."},
    {"id"=>"8bfe...",
     "currency"=>"BTC",
     "balance"=>"9.4426882700000000",
     "hold"=>"0.0000000000000000",
     "available"=>"5.4426882700000000",
     "profile_id"=>"a8f2d8..."}] 

# List orders
cbe.orders

# List orders with pagination
cbe.order({'limit'=>5, after=>1})

# Get specific order by order_id
cbe.order('4488340..')

# Place an order (size, price, side)
cbe.place_order("0.01", "250.000", "buy")
cbe.place_order("0.02", "265.000", "sell")

# Cancel an order by order_id
cbe.cancel_order('488224434...')

# Product fills
cbe.fills

# Get a live feed from the websocket. You'll need to create a lambda to pass
messages to as they are received:
feed = CBX::Feed.new(->{|msg| puts msg.fetch('type')})

# Close the feed if needed
feed.close

Block syntax is fully supported

cbe.accounts do |response|
  puts response
end

cbe.post('orders', {

    "size" => 1.01,
    "price" => 1.100,
    "side" => "buy",
    "product_id" => "BTC-USD"
}) do |response|
  puts response
end

Use at your own risk. I assume no liability for gains or losses you incur while using this gem.