Implement the logic of Bancor protocol.
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Gem Build Status

Implement the logic of Bancor protocol.


Add this line to your application's Gemfile:

gem 'bancor'

And then execute:

$ bundle

Or install it yourself as:

$ gem install bancor


issue/destroy by reserve token

irb(main):008:0> bp = 300000, rate: 1, crr: 0.2)
=> #<Bancor::Protocol:0x00007f93039bd410 @total_supply=300000, @reserved_token=60000.0, @price=1.0, @crr=0.2>

irb(main):009:0> bp.issue_by_reserve_token 300
=> 299.40179372385245

irb(main):010:0> bp
=> #<Bancor::Protocol:0x00007f93039bd410 @total_supply=300299.40179372387, @reserved_token=60300.0, @price=1.003998003989035, @crr=0.2>

irb(main):011:0> bp.issue_by_reserve_token 700
=> 693.9974382206417

irb(main):012:0> bp
=> #<Bancor::Protocol:0x00007f93039bd410 @total_supply=300993.3992319445, @reserved_token=61000.0, @price=1.0133112579155532, @crr=0.2>

irb(main):013:0> bp.destroy_by_reserve_token 1302
=> 1307.966524590907

irb(main):014:0> bp
=> #<Bancor::Protocol:0x00007f93039bd410 @total_supply=299691.3992319445, @reserved_token=59692.033475409095, @price=0.9958916677019946, @crr=0.2>

irb(main):015:0> bp.issue_by_reserve_token 100
=> 100.34530853232869

irb(main):016:0> bp
=> #<Bancor::Protocol:0x00007f93039bd410 @total_supply=299791.7445404769, @reserved_token=59792.033475409095, @price=0.9972261505575943, @crr=0.2>

issue/destroy by smart token

irb(main):015:0> bp = 300000, rate: 1, crr: 0.2)
=> #<Bancor::Protocol:0x00007fb14b0169f0 @total_supply=300000, @reserved_token=60000.0, @price=1.0, @crr=0.2>

irb(main):016:0> bp.issue_by_smart_token 50
=> 0.0

irb(main):017:0> bp
=> #<Bancor::Protocol:0x00007fb14b0169f0 @total_supply=300050, @reserved_token=60000.0, @price=0.9998333611064822, @crr=0.2>

irb(main):018:0> bp.issue_by_smart_token 100
=> 0.0

irb(main):019:0> bp
=> #<Bancor::Protocol:0x00007fb14b0169f0 @total_supply=300150, @reserved_token=60000.0, @price=0.9995002498750625, @crr=0.2>

irb(main):020:0> bp.destroy_by_smart_token 100
=> 0.0

irb(main):021:0> bp
=> #<Bancor::Protocol:0x00007fb14b0169f0 @total_supply=300050, @reserved_token=60000.0, @price=0.9998333611064822, @crr=0.2>

irb(main):022:0> bp.destroy_by_smart_token 50
=> 0.0

irb(main):023:0> bp
=> #<Bancor::Protocol:0x00007fb14b0169f0 @total_supply=300000, @reserved_token=60000.0, @price=1.0, @crr=0.2>


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 adhere to the Contributor Covenant code of conduct.


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

Code of Conduct

Everyone interacting in the Bancor project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.