Ruby API client for crypto market statistics. Currently uses the CoinMarketCap API.

Endpoints update every 5 minutes.
Please limit requests to no more than 10 per minute.

See the link above for more information.


Add this line to your application's Gemfile:

gem 'coin_market'

And then execute:

$ bundle

Or install it yourself as:

$ gem install coin_market


Fetch statistics about a specific token:

res = CoinMarket::Ticker.get('bitcoin')
puts "#{res.symbol}: #{res.price}"
# => BTC: 15330.8
puts "#{}: #{res.market_cap}"
# => Bitcoin: 256933859710.0
puts res.percent_change(period: '1h')
# => -1.03
puts res.percent_change(period: '24h')
# => 6.42

Or fetch statistics for all of the top 100 currencies (based on market cap):

res = CoinMarket::Ticker.all
puts res[0..10].map(&:name).join(', ')
# => Bitcoin, Ethereum, Bitcoin Cash, Ripple, Litecoin, Cardano, IOTA, Dash, NEM, Monero, Bitcoin Gold


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


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to follow the code of conduct.


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

Copyright © 2017 Nick Plante, released under the MIT license