diff --git a/Gemfile.lock b/Gemfile.lock
index 905ed75..9e27685 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    random_gem (0.1.0)
+    random_gem (0.1.1)
       thor
 
 GEM
diff --git a/lib/random_gem.rb b/lib/random_gem.rb
index 21310c4..5a0941c 100644
--- a/lib/random_gem.rb
+++ b/lib/random_gem.rb
@@ -1,4 +1,5 @@
 require "random_gem/cli"
+require "random_gem/query"
 require "random_gem/randomizer"
 require "random_gem/version"
 
@@ -15,4 +16,10 @@ def self.pick
   rescue Randomizer::Error
     raise Error.new
   end
+
+  def self.pick_by_downloads(lower_limit: nil, upper_limit: nil)
+    Randomizer.new.perform( download_options: { min: lower_limit, max: upper_limit }.compact )
+  rescue Randomizer::Error
+    raise Error.new
+  end
 end
diff --git a/lib/random_gem/query.rb b/lib/random_gem/query.rb
new file mode 100644
index 0000000..f853628
--- /dev/null
+++ b/lib/random_gem/query.rb
@@ -0,0 +1,22 @@
+require "random_gem/request"
+require 'timeout'
+
+module RandomGem
+  class Query
+    attr_accessor :name, :min_download, :max_download
+
+    def initialize(name, download_options: {})
+      @name = name
+      @min_download = download_options.dig(:min)
+      @max_download = download_options.dig(:max)
+    end
+
+    def to_parameter_string
+      str = "name: #{name}"
+      str += "   downloads: >#{min_download}" if min_download
+      str += "   downloads: <#{max_download}" if max_download
+
+      str
+    end
+  end
+end
diff --git a/lib/random_gem/randomizer.rb b/lib/random_gem/randomizer.rb
index 485785b..e55c05f 100644
--- a/lib/random_gem/randomizer.rb
+++ b/lib/random_gem/randomizer.rb
@@ -1,22 +1,26 @@
 require "random_gem/request"
+require "random_gem/query"
 require 'timeout'
 
 module RandomGem
   class Randomizer
     class Error < Exception; end
-    TIMEOUT = 30.freeze
-    PAGE = 100.freeze
+    TIMEOUT = 10.freeze
+    PAGE = 10.freeze
 
-    def perform
-      gems = Timeout.timeout(TIMEOUT, RandomGem::Randomizer::Error) { random_pick_loop }
+    def perform(download_options: {})
+      gems = Timeout.timeout(TIMEOUT, RandomGem::Randomizer::Error) { random_pick_loop(download_options: download_options) }
       pick_single_gem(gems: gems)
     end
 
     private
 
-    def random_pick_loop
+    def random_pick_loop(download_options:)
       loop do
-        request = RandomGem::Request.new(keyword: random_letter, page: random_index(max: PAGE))
+        query = Query.new(random_letter, download_options: download_options)
+        page = random_index(max: PAGE)
+
+        request = RandomGem::Request.new(query, page)
         gems = request.do
 
         break gems if gems.length > 0
diff --git a/lib/random_gem/request.rb b/lib/random_gem/request.rb
index 7f60e5d..59f3fd8 100644
--- a/lib/random_gem/request.rb
+++ b/lib/random_gem/request.rb
@@ -2,27 +2,29 @@
 require 'rubygems'
 require 'open-uri'
 require 'json'
+require 'random_gem/query'
 
 module RandomGem
   class Request
     HOST = "https://rubygems.org"
     PATH = "/api/v1/search"
-    attr_reader :keyword, :page
+    attr_reader :query, :page
 
-    def initialize(keyword:, page:)
-      @keyword = keyword
+    def initialize(query, page)
+      @query = query
       @page = page
     end
 
     def do
       uri = URI("#{HOST}#{PATH}")
-      params = { query: keyword, page: page }
+      params = { page: 1, query: query.to_parameter_string }
       uri.query = URI.encode_www_form(params)
 
       http = Net::HTTP.new(uri.host, uri.port)
       http.use_ssl = true
 
       res = http.get(uri.request_uri)
+
       respond(res: res)
     end