diff --git a/app/controllers/api/v2/blocks_controller.rb b/app/controllers/api/v2/blocks_controller.rb
index 0e06262..c915abe 100644
--- a/app/controllers/api/v2/blocks_controller.rb
+++ b/app/controllers/api/v2/blocks_controller.rb
@@ -19,11 +19,13 @@ class Api::V2::BlocksController < ApplicationController
   #
   # GET /v2/api/blocks
   def index
+    params.transform_keys!(&:underscore)
+
     options = {
-      block_number_gteq: parse_hex(params[:numberFrom]),
-      block_number_lteq: parse_hex(params[:numberTo]),
-      transaction_count_gteq: parse_hex(params[:transactionFrom]),
-      transaction_count_lteq: parse_hex(params[:transactionTo])
+      block_number_gteq: parse_hex(params[:number_from]),
+      block_number_lteq: parse_hex(params[:number_to]),
+      transaction_count_gteq: parse_hex(params[:transaction_from]),
+      transaction_count_lteq: parse_hex(params[:transaction_to])
     }
 
     blocks = Block.ransack(options).result.order(block_number: :desc)
@@ -35,7 +37,7 @@ def index
       blocks = blocks.offset(offset).limit(limit)
     else
       # use page and perPage
-      blocks = blocks.page(params[:page]).per(params[:perPage])
+      blocks = blocks.page(params[:page]).per(params[:per_page])
     end
 
     render json: {
diff --git a/spec/controllers/api/v2/blocks_controller_spec.rb b/spec/controllers/api/v2/blocks_controller_spec.rb
index caf6b2d..e837ca3 100644
--- a/spec/controllers/api/v2/blocks_controller_spec.rb
+++ b/spec/controllers/api/v2/blocks_controller_spec.rb
@@ -10,6 +10,38 @@
   let(:result) { Oj.load(response.body).with_indifferent_access[:result] }
   let(:count) { result[:blocks].size }
 
+  context "params transform" do
+    let(:params) do
+      ActionController::Parameters.new({
+        numberFrom: 0,
+        numberTo: 10,
+        transactionFrom: 20,
+        transactionTo: 30,
+        page: 40,
+        perPage: 50,
+        offset: 60,
+        limit: 70
+      })
+    end
+
+    let(:transformed_params) do
+      ActionController::Parameters.new({
+        number_from: 0,
+        number_to: 10,
+        transaction_from: 20,
+        transaction_to: 30,
+        page: 40,
+        per_page: 50,
+        offset: 60,
+        limit: 70
+      })
+    end
+
+    it "transform underscore" do
+      expect(params.transform_keys!(&:underscore)).to eq transformed_params
+    end
+  end
+
   context "index" do
     it "no params" do
       post :index, params: {}