feat: add external stats api

app/controllers/api/v1/external/stats_controller.rb

@@ -0,0 +1,15 @@
+module Api
+  module V1
+    module External
+      class StatsController < ApplicationController
+        skip_before_action :check_header_info
+
+        def show
+          return if params[:id] != "tip_block_number"
+
+          render json: Block.recent.first&.number.to_s
+        end
+      end
+    end
+  end
+end

config/routes.rb

@@ -9,6 +9,9 @@
 
   namespace :api do
     namespace :v1 do
+      namespace :external do
+        resources :stats, only: :show
+      end
       resources :blocks, only: %i(index show)
       resources :address_transactions, only: :show
       resources :block_transactions, only: :show