Stellar SDK for Ruby: XDR and Low Level Abstractions

stellar-base Test Maintainability

The stellar-base library is the lowest-level stellar helper library. It consists of classes to read, write, hash, and sign the xdr structures that are used in stellard.


Add this line to your application's Gemfile:

gem 'stellar-base'

And then execute:

$ bundle

Also requires libsodium. Installable via brew install libsodium on OS X.

Supported Ruby Versions

Please see CI Workflow for what versions of ruby are currently tested by our continuous integration system. Any ruby in that list is officially supported.


It seems as though jruby is particularly slow when it comes to BigDecimal math; the source behind this slowness has not been investigated, but it is something to be aware of.


Examples are here

In addition to the code generated from the XDR definition files (see ruby-xdr for example usage), this library also provides some stellar specific features. Let's look at some of them.

We wrap rbnacl with Stellar::KeyPair, providing some stellar specific functionality as seen below:

# Create a keypair from a stellar secret seed

# Create a keypair from a stellar address
verifier = Stellar::KeyPair.from_address("GBQWWBFLRP3BXD2RI2FH7XNNU2MKIYVUI7QXUAIVG34JY6MQGXVUO3RX")

# Produce a stellar compliant "decorated signature" that is compliant with stellar transactions

signer.sign_decorated("Hello world!") # => #<Stellar::DecoratedSignature ...>

This library also provides an impementation of Stellar's "StrKey" encoding (RFC-4648 Base32 + CCITT-XModem CRC16):

Stellar::Util::StrKey.check_encode(:account_id, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF") # => "GD777777777764TU"
Stellar::Util::StrKey.check_encode(:seed, "\x00\x00\x00\x00\x00\x00\x39") # => "SAAAAAAAAAADST3H"

# To prevent interpretation mistakes, you must pass the expected version byte
# when decoding a check_encoded value

encoded = Stellar::Util::StrCheck.check_encode(:account_id, "\x61\x6b\x04\xab\x8b\xf6\x1b")
Stellar::Util::StrKey.check_decode(:account_id, encoded) # => "\x61\x6b\x04\xab\x8b\xf6\x1b"
Stellar::Util::StrKey.check_decode(:seed, encoded) # => throws ArgumentError: Unexpected version: :account_id

During development of your app, you may include the FactoryBot definitions in your specs:

require "stellar-base/factories"

See the factories file for information on what factories are available.

Updating Generated Code

The generated code of this library must be refreshed each time the Stellar network's protocol is updated. To perform this task, run rake xdr:update, which will download the latest .x files into the xdr folder and will run xdrgen to regenerate the built ruby code.


The current integration of user-written code with auto-generated classes is to put it nicely, weird. We intend to segregate the auto-generated code into its own namespace and refrain from monkey patching them. This will happen before 1.0, and hopefully will happen soon.


Please see for details.