Ruby
Ruby library to query market data from cryptocurrency exchanges ( https://www.coingecko.com )

Cryptoexchange

Cryptoexchange is a rubygem for ruby developers to interact with over 200+ cryptocurrency exchange market data APIs in a single library.

Installation

Add this line to your application's Gemfile:

gem 'cryptoexchange'

And then execute:

$ bundle

Or install it yourself as:

$ gem install cryptoexchange

Exchanges Supported

** Mapping and data may be incorrect (Cannot determine correctness)

*** User-Defined requires pair id

Usage

List market pairs supported by an exchange

  client = Cryptoexchange::Client.new
  pairs = client.pairs('bitflyer')

List exchange services for certain currency

  client.exchange_for('btc')

  # ['anx', 'binance', ...]

Query the Ticker API

  pair = client.pairs('bitflyer').first
  ticker = client.ticker(pair)
  ticker.base
  ticker.target
  ticker.last

Query the Ticker stream API

  pair = client.pairs('bitfinex').first
  thread = client.ticker_stream(
    market_pair: pair,
    onopen: Proc.new { puts 'Opened!' },
    onmessage: Proc.new do |ticker|
                 puts ticker.base
                 puts ticker.target
                 puts ticker.last
                 # ...
               end,
    onclose: Proc.new { puts 'Closed!' },
  )

  thread.kill

Query the OrderBook API

  # Check if exchange has support for OrderBook
  pair = client.pairs('bitbank').first
  order_book = client.order_book(pair)
  order_book.base
  order_book.target
  order_book.bids
  order_book.asks

Query the OrderBook stream API

  pair = client.pairs('bitfinex').first
  thread = client.order_book_stream(
    market_pair: pair,
    onopen: Proc.new { puts 'Opened!' },
    onmessage: Proc.new do |order_book|
                 puts order_book.asks[0].price if order_book.asks[0]
                 puts order_book.bids[0].price if order_book.bids[0]
                 # ...
               end,
    onclose: Proc.new { puts 'Closed!' },
  )

  thread.kill

Query the Trades API

  # Check if exchange has support for Trades
  # returns array

  pair = client.pairs('neraex').first
  trades = client.trades(pair)
  trades[0].base
  trades[0].target
  trades[0].price
  trades[0].amount

Query the Trade stream API

  pair = client.pairs('bitfinex').first
  thread = client.trade_stream(
    market_pair: pair,
    onopen: Proc.new { puts 'Opened!' },
    onmessage: Proc.new do |trade|
                 puts trade.trade_id
                 puts trade.price
                 puts trade.amount
                 # ...
               end,
    onclose: Proc.new { puts 'Closed!' },
  )

  thread.kill

Get Exchange Trade URL (Work in Progress)

  client.trade_page_url 'binance', base: 'BTC', target: 'USDT'

Market List

Some exchange API do not support market pair listings. For those exchanges, we included a custom YML file to define the list of market pairs supported by that exchange. That configuration works out of the box, however if that exchange adds new market pairs, you as the user of Cryptoexchange can explicitly add those pairs instead of waiting for this library to be updated.

In the table above, look for the User-Defined under the Market List column.

The format of the yaml file should look like below. Name the file <exchange_name>.yml and place it under the config/cryptoexchange directory.

  :pairs:
    - :base: BTC
      :target: KRW
    - :base: ETH
      :target: KRW
    - :base: ETC
      :target: KRW

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/coingecko/cryptoexchange. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

When implementing a new exchange for HTTP API, refer to this guide. For Websocket API, refer to this guide

The contributing guide may also be useful to you.

You can chat with the core team member or other participating in this repository chat on https://gitter.im/cryptoexchange-api/Lobby/~chat#

License

The gem is available as open source under the terms of the MIT License.