diff --git a/spec/apis/transactions_controller_spec.rb b/spec/apis/transactions_controller_spec.rb
index e987efd..b11f596 100644
--- a/spec/apis/transactions_controller_spec.rb
+++ b/spec/apis/transactions_controller_spec.rb
@@ -1,4 +1,14 @@
 describe TransactionsController, type: :api do
+  let(:api_attributes) do
+    {
+      debtor:   create(:user).name,
+      creditor: create(:user).name,
+      message:  Faker::Lorem.sentence,
+      euros:    rand(2),
+      cents:    1 + rand(100)
+    }
+  end
+
   before :each do
     @client = Client.create name: "Tap"
     @key = @client.key
@@ -11,7 +21,7 @@ describe TransactionsController, type: :api do
     end
 
     it "should work with valid key" do
-      post '/transactions', { transaction: attributes_for(:transaction) }, { 'HTTP_ACCEPT' => "application/json", "X_API_KEY" => @key }
+      post '/transactions', { transaction: api_attributes }, { 'HTTP_ACCEPT' => "application/json", "X_API_KEY" => @key }
       expect(last_response.status).to eq(201)
     end
   end