x.rb

class API
	def initialize(...)
		@faraday = Faraday.new(...) do |c|
			c.blahblah
		end
	end
	
	def getspecificthings
		@faraday.get('specificthings').body.map {|x| SpecificAPIThing(x) }
	end

	class GenericAPIThing
		def initialize(name)
			@name = name
		end

	class SpecificAPIThing < GenericAPIThing
		def initialize(*)
			super
		end

		def actionforspecificthing(var)
			@faraday.get(var)
		end
	end
end

class API
  def initialize(name, *)
    @name = name
    @faraday = Faraday.new(*) do |c|
      c.blahblah
    end
  end
	
  def get_specific_things
    @faraday.get('specificthings').body.map { |x| SpecificAPIThing(x) }
  end
end

class SpecificAPI < API
  def initialize(*)
    super
  end

  def action_for_specific_thing(var)
    @faraday.get(var)
  end
end