diff --git a/lib/glueby/contract/tx_builder.rb b/lib/glueby/contract/tx_builder.rb
index 8806e5d..db2efab 100644
--- a/lib/glueby/contract/tx_builder.rb
+++ b/lib/glueby/contract/tx_builder.rb
@@ -206,7 +206,7 @@ def create_multi_transfer_tx(color_id:, sender:, receivers:, fee_estimator: FeeE
         tx = Tapyrus::Tx.new
 
         amount = receivers.reduce(0) { |sum, r| sum + r[:amount].to_i }
-        utxos = sender.internal_wallet.list_unspent(color_id, only_finalized)
+        utxos = sender.internal_wallet.list_unspent(only_finalized, color_id: color_id)
         sum_token, outputs = collect_colored_outputs(utxos, amount)
         fill_input(tx, outputs)
 
@@ -247,7 +247,7 @@ def create_multi_transfer_tx(color_id:, sender:, receivers:, fee_estimator: FeeE
       def create_burn_tx(color_id:, sender:, amount: 0, fee_estimator: FeeEstimator::Fixed.new, only_finalized: true)
         tx = Tapyrus::Tx.new
 
-        utxos = sender.internal_wallet.list_unspent(color_id, only_finalized)
+        utxos = sender.internal_wallet.list_unspent(only_finalized, color_id: color_id)
         sum_token, outputs = collect_colored_outputs(utxos, amount)
         fill_input(tx, outputs)
 
diff --git a/lib/glueby/fee_provider/tasks.rb b/lib/glueby/fee_provider/tasks.rb
index 31b2b2c..00f2df4 100644
--- a/lib/glueby/fee_provider/tasks.rb
+++ b/lib/glueby/fee_provider/tasks.rb
@@ -114,7 +114,7 @@ def collect_outputs
 
       def current_utxo_pool_size
         wallet
-          .list_unspent(nil, false)
+          .list_unspent(false)
           .count { |o| !o[:color_id] && o[:amount] == fee_provider.fixed_fee }
       end
 
diff --git a/lib/glueby/internal/wallet.rb b/lib/glueby/internal/wallet.rb
index 0e4d1d7..66a11be 100644
--- a/lib/glueby/internal/wallet.rb
+++ b/lib/glueby/internal/wallet.rb
@@ -89,20 +89,29 @@ def balance(only_finalized = true)
         wallet_adapter.balance(id, only_finalized)
       end
 
-      def list_unspent_with_count(color_id = nil, only_finalized = true, label = nil, page = 1, per = 25)
-        wallet_adapter.list_unspent_with_count(id, color_id, only_finalized, label, page, per)
-      end
-
+      # @param only_finalized [Boolean] The flag to get a UTXO with status only finalized
+      # @param label [String] This label is used to filtered the UTXOs with labeled if a key or Utxo is labeled.
+      #                    - If label is nil or :unlabeled, only unlabeled UTXOs will be returned.
+      #                    - If label=:all, all UTXOs will be returned.
       # @param color_id [Tapyrus::Color::ColorIdentifier] The color identifier associated with UTXO.
       #                    It will return only UTXOs with specified color_id. If color_id is nil, it will return all UTXOs.
       #                    If Tapyrus::Color::ColorIdentifier.default is specified, it will return uncolored UTXOs(i.e. TPC)
+      # @param page [Integer] The page parameter is responsible for specifying the current page being viewed within the paginated results. default is 1.
+      # @param per [Integer] The per parameter is used to determine the number of items to display per page. default is 25.
+      def list_unspent_with_count(only_finalized = true, label = nil, color_id: nil, page: 1, per: 25)
+        wallet_adapter.list_unspent_with_count(id, only_finalized, label, color_id: color_id, page: page, per: per)
+      end
+
       # @param only_finalized [Boolean] The flag to get a UTXO with status only finalized
       # @param label [String] This label is used to filtered the UTXOs with labeled if a key or Utxo is labeled.
       #                    - If label is nil or :unlabeled, only unlabeled UTXOs will be returned.
       #                    - If label=:all, all UTXOs will be returned.
-      def list_unspent(color_id = nil, only_finalized = true, label = :unlabeled)
+      # @param color_id [Tapyrus::Color::ColorIdentifier] The color identifier associated with UTXO.
+      #                    It will return only UTXOs with specified color_id. If color_id is nil, it will return all UTXOs.
+      #                    If Tapyrus::Color::ColorIdentifier.default is specified, it will return uncolored UTXOs(i.e. TPC)
+      def list_unspent(only_finalized = true, label = :unlabeled, color_id: nil )
         label = :unlabeled unless label
-        wallet_adapter.list_unspent(id, color_id, only_finalized, label)
+        wallet_adapter.list_unspent(id, only_finalized, label, color_id: color_id)
       end
 
       def lock_unspent(utxo)
@@ -302,7 +311,7 @@ def collect_utxos(
         collect_all = amount.nil?
 
         raise Glueby::ArgumentError, 'amount must be positive' unless collect_all || amount.positive?
-        utxos = list_unspent(color_id, only_finalized, label)
+        utxos = list_unspent(only_finalized, label, color_id: color_id)
         utxos = utxos.shuffle if shuffle
 
         r = utxos.inject([0, []]) do |(sum, outputs), output|
diff --git a/lib/glueby/internal/wallet/abstract_wallet_adapter.rb b/lib/glueby/internal/wallet/abstract_wallet_adapter.rb
index 1df7b64..9300e8c 100644
--- a/lib/glueby/internal/wallet/abstract_wallet_adapter.rb
+++ b/lib/glueby/internal/wallet/abstract_wallet_adapter.rb
@@ -68,15 +68,15 @@ def balance(wallet_id, only_finalized = true)
         # Returns all tokens with specified color_id
         #
         # @param [String] wallet_id - The wallet id that is offered by `create_wallet()` method.
+        # @param [Boolean] only_finalized - includes only finalized UTXO value if it
+        #                                   is true. Default is true.
         # @param [Tapyrus::Color::ColorIdentifier] color_id The color identifier associated with UTXO.
         #                                                     It will return only UTXOs with specified color_id. If color_id is nil, it will return all UTXOs.
         #                                                     If Tapyrus::Color::ColorIdentifier.default is specified, it will return uncolored UTXOs(i.e. TPC)
-        # @param [Boolean] only_finalized - includes only finalized UTXO value if it
-        #                                   is true. Default is true.
         # @param [Integer] page - The page parameter is responsible for specifying the current page being viewed within the paginated results. default is 1.
         # @param [Integer] per - The per parameter is used to determine the number of items to display per page. default is 25.
         # @return [Array<Utxo>] The array of the utxos with specified color_id
-        def list_unspent_with_count(wallet_id, color_id = nil, only_finalized = true, label = nil, page = 1, per = 25)
+        def list_unspent_with_count(wallet_id, only_finalized = true, label = nil, color_id: nil, page: 1, per: 25)
           raise NotImplementedError, "You must implement #{self.class}##{__method__}"
         end
 
@@ -84,14 +84,14 @@ def list_unspent_with_count(wallet_id, color_id = nil, only_finalized = true, la
         # If label is specified, return UTXOs filtered with label
         #
         # @param [String] wallet_id - The wallet id that is offered by `create_wallet()` method.
-        # @param [Tapyrus::Color::ColorIdentifier] color_id - The color identifier. 
-        #                                                     It will return only UTXOs with specified color_id. If color_id is nil, it will return all UTXOs.
-        #                                                     If Tapyrus::Color::ColorIdentifier.default is specified, it will return uncolored UTXOs(i.e. TPC)
         # @param [Boolean] only_finalized - The UTXOs includes only finalized UTXO value if it
         #                                   is true. Default is true.
         # @param [String] label - Label for filtering UTXOs
         #                       - If label is nil or :unlabeled, only unlabeled UTXOs will be returned.
         #                       - If label=:all, it will return all utxos
+        # @param [Tapyrus::Color::ColorIdentifier] color_id - The color identifier. 
+        #                                                     It will return only UTXOs with specified color_id. If color_id is nil, it will return all UTXOs.
+        #                                                     If Tapyrus::Color::ColorIdentifier.default is specified, it will return uncolored UTXOs(i.e. TPC)
         # @return [Array of UTXO]
         #
         # ## The UTXO structure
@@ -102,7 +102,7 @@ def list_unspent_with_count(wallet_id, color_id = nil, only_finalized = true, la
         # - finalized: [Boolean] Whether the UTXO is finalized
         # - color_id: [String] Color id of the UTXO. If it is TPC UTXO, color_id is nil.
         # - script_pubkey: [String] Script pubkey of the UTXO
-        def list_unspent(wallet_id, color_id = nil, only_finalized = true, label = nil)
+        def list_unspent(wallet_id, only_finalized = true, label = nil, color_id: nil)
           raise NotImplementedError, "You must implement #{self.class}##{__method__}"
         end
 
diff --git a/lib/glueby/internal/wallet/active_record_wallet_adapter.rb b/lib/glueby/internal/wallet/active_record_wallet_adapter.rb
index 1654bd0..7ec891a 100644
--- a/lib/glueby/internal/wallet/active_record_wallet_adapter.rb
+++ b/lib/glueby/internal/wallet/active_record_wallet_adapter.rb
@@ -90,7 +90,7 @@ def balance(wallet_id, only_finalized = true)
           utxos.sum(&:value)
         end
 
-        def list_unspent_with_count(wallet_id, color_id = nil, only_finalized = true, label = nil, page = 1, per = 25)
+        def list_unspent_with_count(wallet_id, only_finalized = true, label = nil, color_id: nil, page: 1, per: 25)
           utxos = list_unspent_internal(wallet_id, color_id, only_finalized, label)
           utxos = utxos.page(page).per(per) if per > 0
           {
@@ -99,7 +99,7 @@ def list_unspent_with_count(wallet_id, color_id = nil, only_finalized = true, la
           }
         end 
 
-        def list_unspent(wallet_id, color_id = nil, only_finalized = true, label = nil)
+        def list_unspent(wallet_id, only_finalized = true, label = nil, color_id: nil)
           utxos = list_unspent_internal(wallet_id, color_id, only_finalized, label)
           utxos_to_h(utxos)
         end
diff --git a/lib/glueby/internal/wallet/tapyrus_core_wallet_adapter.rb b/lib/glueby/internal/wallet/tapyrus_core_wallet_adapter.rb
index 586bf70..e6025d8 100644
--- a/lib/glueby/internal/wallet/tapyrus_core_wallet_adapter.rb
+++ b/lib/glueby/internal/wallet/tapyrus_core_wallet_adapter.rb
@@ -84,7 +84,7 @@ def balance(wallet_id, only_finalized = true)
 
         # If label=nil, it will return unlabeled utxos to protect labeled utxos for specific purpose
         # If label=:all, it will return all utxos
-        def list_unspent(wallet_id, color_id = nil, only_finalized = true, label = nil)
+        def list_unspent(wallet_id, only_finalized = true, label = nil, color_id: nil)
           perform_as(wallet_id) do |client|
             min_conf = only_finalized ? 1 : 0
             res = client.listunspent(min_conf)
diff --git a/lib/glueby/utxo_provider.rb b/lib/glueby/utxo_provider.rb
index 1cc7043..af05181 100644
--- a/lib/glueby/utxo_provider.rb
+++ b/lib/glueby/utxo_provider.rb
@@ -114,7 +114,7 @@ def tpc_amount
 
     def current_utxo_pool_size
       wallet
-        .list_unspent(nil, false)
+        .list_unspent(false)
         .count { |o| !o[:color_id] && o[:amount] == default_value }
     end
 
diff --git a/lib/glueby/wallet.rb b/lib/glueby/wallet.rb
index b681fab..fc8f0af 100644
--- a/lib/glueby/wallet.rb
+++ b/lib/glueby/wallet.rb
@@ -37,7 +37,7 @@ def id
 
     # @return [HashMap] hash of balances which key is color_id or empty string, and value is amount
     def balances(only_finalized = true)
-      utxos = @internal_wallet.list_unspent(nil, only_finalized)
+      utxos = @internal_wallet.list_unspent(only_finalized)
       utxos.inject({}) do |balances, output|
         key = output[:color_id] || ''
         balances[key] ||= 0
@@ -47,7 +47,7 @@ def balances(only_finalized = true)
     end
 
     def token_utxos(color_id = nil, only_finalized = true, page = 1, per = 25)
-      @internal_wallet.list_unspent_with_count(color_id, only_finalized, nil, page, per)
+      @internal_wallet.list_unspent_with_count(only_finalized, nil, color_id: color_id, page: page, per: per)
     end
 
     private
diff --git a/spec/functional/payment_spec.rb b/spec/functional/payment_spec.rb
index c553e95..8b2dcb5 100644
--- a/spec/functional/payment_spec.rb
+++ b/spec/functional/payment_spec.rb
@@ -29,8 +29,8 @@
         end.to raise_error(Glueby::Contract::Errors::InsufficientFunds)
 
         # should not consume 'labeled' utxos
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled').size).to eq(1)
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled')[0][:amount]).to eq(5_000_000_000)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled').size).to eq(1)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled')[0][:amount]).to eq(5_000_000_000)
 
         # create a usable utxo for payment
         process_block(to_address: sender.internal_wallet.receive_address)
@@ -48,8 +48,8 @@
         # receiver got the sent amount
         expect(receiver.balances(false)['']).to eq(10_000)
         # should not consume 'labeled' utxos
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled').size).to eq(1)
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled')[0][:amount]).to eq(5_000_000_000)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled').size).to eq(1)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled')[0][:amount]).to eq(5_000_000_000)
       end
     end
 
@@ -74,8 +74,8 @@
         end.to raise_error(Glueby::Contract::Errors::InsufficientFunds)
 
         # should not consume 'labeled' utxos
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled').size).to eq(1)
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled')[0][:amount]).to eq(5_000_000_000 + fixed_fee)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled').size).to eq(1)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled')[0][:amount]).to eq(5_000_000_000 + fixed_fee)
 
         # create a usable utxo for payment
         process_block(to_address: sender.internal_wallet.receive_address)
@@ -92,8 +92,8 @@
         # receiver got the sent amount
         expect(receiver.balances(false)['']).to eq(10_000)
         # should not consume 'labeled' utxos
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled').size).to eq(1)
-        expect(sender.internal_wallet.list_unspent(nil, false, 'labeled')[0][:amount]).to eq(5_000_000_000 + fixed_fee)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled').size).to eq(1)
+        expect(sender.internal_wallet.list_unspent(false, 'labeled')[0][:amount]).to eq(5_000_000_000 + fixed_fee)
 
         sighashtype = tx.inputs[-1].script_sig.chunks.first.pushed_data[-1].unpack1('C')
         expect(sighashtype).to eq(Tapyrus::SIGHASH_TYPE[:all])
diff --git a/spec/functional/token_spec.rb b/spec/functional/token_spec.rb
index ec327fd..1236133 100644
--- a/spec/functional/token_spec.rb
+++ b/spec/functional/token_spec.rb
@@ -386,7 +386,7 @@
 
       expect(sender.balances(false)['']).to be_nil
       expect(sender.balances(false)[token2.color_id.to_hex]).to eq(10_000)
-      expect(sender.internal_wallet.list_unspent(nil, false).select {|i| i[:color_id] == token2.color_id.to_hex}.size).to eq(100)
+      expect(sender.internal_wallet.list_unspent(false).select {|i| i[:color_id] == token2.color_id.to_hex}.size).to eq(100)
 
       # Specify metadata option
       token3, _txs = Glueby::Contract::Token.issue!(
@@ -457,7 +457,7 @@
 
       expect(sender.balances(false)[token.color_id.to_hex]).to be_nil
       expect(receiver.balances(false)[token.color_id.to_hex]).to eq(10_000)
-      expect(receiver.internal_wallet.list_unspent(nil, false).select {|i| i[:color_id] == token.color_id.to_hex}.size).to eq(100)
+      expect(receiver.internal_wallet.list_unspent(false).select {|i| i[:color_id] == token.color_id.to_hex}.size).to eq(100)
     end
 
     it 'doesn\'t raise insufficient error in too much split number' do
diff --git a/spec/glueby/contract/timestamp_spec.rb b/spec/glueby/contract/timestamp_spec.rb
index 44fa78d..daf4d21 100644
--- a/spec/glueby/contract/timestamp_spec.rb
+++ b/spec/glueby/contract/timestamp_spec.rb
@@ -358,7 +358,7 @@
 
       it 'the wallet never store the UTXO of the created trackable timestamp' do
         subject
-        result = wallet.internal_wallet.list_unspent(nil, false, :all).find { |i| i[:txid] == contract.txid && i[:vout] == 0 }
+        result = wallet.internal_wallet.list_unspent(false, :all).find { |i| i[:txid] == contract.txid && i[:vout] == 0 }
         expect(result).to be_nil
       end
     end
diff --git a/spec/glueby/contract/token_spec.rb b/spec/glueby/contract/token_spec.rb
index 48c4bad..d9f060e 100644
--- a/spec/glueby/contract/token_spec.rb
+++ b/spec/glueby/contract/token_spec.rb
@@ -86,16 +86,16 @@
 
   before do
     allow(internal_wallet).to receive(:list_unspent).and_return([])
-    allow(internal_wallet).to receive(:list_unspent).with(Tapyrus::Color::ColorIdentifier.default, true, nil).and_return(unspents.select{ |i| !i[:color_id] && i[:finalized] })
-    allow(internal_wallet).to receive(:list_unspent).with(Tapyrus::Color::ColorIdentifier.default, false, nil).and_return(unspents.select{ |i| !i[:color_id] })
+    allow(internal_wallet).to receive(:list_unspent).with(true, nil, color_id: Tapyrus::Color::ColorIdentifier.default).and_return(unspents.select{ |i| !i[:color_id] && i[:finalized] })
+    allow(internal_wallet).to receive(:list_unspent).with(false, nil, color_id: Tapyrus::Color::ColorIdentifier.default).and_return(unspents.select{ |i| !i[:color_id] })
     [
       "c3eb2b846463430b7be9962843a97ee522e3dc0994a0f5e2fc0aa82e20e67fe893",
       "c2dbbebb191128de429084246fa3215f7ccc36d6abde62984eb5a42b1f2253a016",
       "c150ad685ec8638543b2356cb1071cf834fb1c84f5fa3a71699c3ed7167dfcdbb3",
     ].each do |color_id_hex|
       color_id = Tapyrus::Color::ColorIdentifier.parse_from_payload(color_id_hex.htb)
-      allow(internal_wallet).to receive(:list_unspent).with(color_id, true, nil).and_return(unspents.select{ |i| i[:color_id] == color_id_hex && i[:finalized] })
-      allow(internal_wallet).to receive(:list_unspent).with(color_id, false, nil).and_return(unspents.select{ |i| i[:color_id] == color_id_hex })
+      allow(internal_wallet).to receive(:list_unspent).with(true, nil, color_id: color_id).and_return(unspents.select{ |i| i[:color_id] == color_id_hex && i[:finalized] })
+      allow(internal_wallet).to receive(:list_unspent).with(false, nil, color_id: color_id).and_return(unspents.select{ |i| i[:color_id] == color_id_hex })
     end
     allow(Glueby::Internal::RPC).to receive(:client).and_return(rpc)
     allow(rpc).to receive(:sendrawtransaction).and_return('')
diff --git a/spec/glueby/contract/tx_builder_spec.rb b/spec/glueby/contract/tx_builder_spec.rb
index 07efa0f..2cd2de7 100644
--- a/spec/glueby/contract/tx_builder_spec.rb
+++ b/spec/glueby/contract/tx_builder_spec.rb
@@ -387,7 +387,7 @@ class TxBuilderMock
     let(:amount) { 100_001 }
     
     before do
-      allow(internal_wallet).to receive(:list_unspent).with(color_id, true)
+      allow(internal_wallet).to receive(:list_unspent).with(true, color_id: color_id)
         .and_return(unspents.select { |utxo| utxo[:color_id] == 'c150ad685ec8638543b2356cb1071cf834fb1c84f5fa3a71699c3ed7167dfcdbb3' })
     end
     it { expect(subject.inputs.size).to eq 3 }
@@ -395,6 +395,8 @@ class TxBuilderMock
     it { expect(subject.inputs[0].out_point.index).to eq 0 }
     it { expect(subject.inputs[1].out_point.txid).to eq 'a3f20bc94c8d77c35ba1770116d2b34375475a4194d15f76442636e9f77d50d9' }
     it { expect(subject.inputs[1].out_point.index).to eq 2 }
+    it { expect(subject.inputs[2].out_point.txid).to eq '5c3d79041ff4974282b8ab72517d2ef15d8b6273cb80a01077145afb3d5e7cc5' }
+    it { expect(subject.inputs[2].out_point.index).to eq 0 }
     it { expect(subject.outputs.size).to eq 3 }
     it { expect(subject.outputs[0].value).to eq 100_001 }
     it { expect(subject.outputs[0].colored?).to be_truthy }
@@ -426,7 +428,7 @@ class TxBuilderMock
     end
 
     before do
-      allow(internal_wallet).to receive(:list_unspent).with(color_id, true)
+      allow(internal_wallet).to receive(:list_unspent).with(true, color_id: color_id)
         .and_return(unspents.select { |utxo| utxo[:color_id] == 'c150ad685ec8638543b2356cb1071cf834fb1c84f5fa3a71699c3ed7167dfcdbb3' })
     end
 
@@ -488,7 +490,7 @@ class TxBuilderMock
 
 
     before do
-      allow(internal_wallet).to receive(:list_unspent).with(color_id, true)
+      allow(internal_wallet).to receive(:list_unspent).with(true, color_id: color_id)
         .and_return(unspents.select { |utxo| utxo[:color_id] == 'c150ad685ec8638543b2356cb1071cf834fb1c84f5fa3a71699c3ed7167dfcdbb3' })
     end
 
diff --git a/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb b/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb
index a0911ac..c9c6246 100644
--- a/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb
+++ b/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb
@@ -149,7 +149,7 @@
       it { expect(subject[1][:label]).to eq nil }
     end
 
-    subject { adapter.list_unspent(wallet.wallet_id, color_id, only_finalized, label) }
+    subject { adapter.list_unspent(wallet.wallet_id, only_finalized, label, color_id: color_id) }
 
     let(:other_wallet) { Glueby::Internal::Wallet::AR::Wallet.create(wallet_id: adapter.create_wallet) }
     let(:only_finalized) { true }
@@ -525,7 +525,7 @@
   end
 
   describe '#list_unspent_with_count' do
-    subject { adapter.list_unspent_with_count(wallet_id, color_id, only_finalized, label, page, per) }
+    subject { adapter.list_unspent_with_count(wallet_id, only_finalized, label, color_id: color_id, page: page, per: per) }
 
     let(:wallet_id) { wallet.wallet_id }
     let(:color_id) { Tapyrus::Color::ColorIdentifier.parse_from_payload('c185856a84c483fb108b1cdf79ff53aa7d54d1a137a5178684bd89ca31f906b2bd'.htb) }
diff --git a/spec/glueby/internal/wallet/tapyrus_core_wallet_adapter_spec.rb b/spec/glueby/internal/wallet/tapyrus_core_wallet_adapter_spec.rb
index f9bfd36..f00eef2 100644
--- a/spec/glueby/internal/wallet/tapyrus_core_wallet_adapter_spec.rb
+++ b/spec/glueby/internal/wallet/tapyrus_core_wallet_adapter_spec.rb
@@ -255,7 +255,7 @@
       end
     end
 
-    subject { adapter.list_unspent(wallet_id, color_id, only_finalized) }
+    subject { adapter.list_unspent(wallet_id, only_finalized, color_id: color_id) }
 
     let(:wallet_id) { ARBITRARY_WALLET_ID }
     let(:color_id) { nil }
@@ -350,7 +350,7 @@
     end
 
     context 'with label' do
-      subject { adapter.list_unspent(wallet_id, color_id, true, "Glueby-Contract-Tracking") }
+      subject { adapter.list_unspent(wallet_id, true, "Glueby-Contract-Tracking", color_id: color_id) }
       it 'should call listunspent RPC with label and parse the results.' do
         expect(rpc).to receive(:listunspent).and_return(response)
         expect(subject).to eq([
@@ -368,15 +368,15 @@
     end
 
     context 'with unlabeled by assign :unlabeled' do
-      subject { adapter.list_unspent(wallet_id, color_id, true, :unlabeled) }
+      subject { adapter.list_unspent(wallet_id, true, :unlabeled, color_id: color_id) }
       it_behaves_like 'executes the common unlabeled validation'
     end
     context 'with unlabeled by default' do
-      subject { adapter.list_unspent(wallet_id, color_id, true, :unlabeled) }
+      subject { adapter.list_unspent(wallet_id, true, :unlabeled, color_id: color_id) }
       it_behaves_like 'executes the common unlabeled validation'
     end
     context 'with all utxos' do
-      subject { adapter.list_unspent(wallet_id, color_id, true, :all) }
+      subject { adapter.list_unspent(wallet_id, true, :all, color_id: color_id) }
       it 'should call listunspent RPC with all utxos and parse the results.' do
         expect(rpc).to receive(:listunspent).and_return(response)
         expect(subject).to eq([
diff --git a/spec/glueby/internal/wallet_spec.rb b/spec/glueby/internal/wallet_spec.rb
index 7bba385..5e8de7f 100644
--- a/spec/glueby/internal/wallet_spec.rb
+++ b/spec/glueby/internal/wallet_spec.rb
@@ -206,7 +206,7 @@ def load_wallet(wallet_id); end
       let(:only_finalized) { false }
 
       it do
-        allow(internal_wallet).to receive(:list_unspent).with(Tapyrus::Color::ColorIdentifier.default, false, nil).and_return(unspents.select{ |u| !u[:color_id]})
+        allow(internal_wallet).to receive(:list_unspent).with(false, nil, color_id: Tapyrus::Color::ColorIdentifier.default).and_return(unspents.select{ |u| !u[:color_id]})
         expect(subject[0]).to eq 250_000_000
         expect(subject[1].size).to eq 3
       end
@@ -223,7 +223,7 @@ def load_wallet(wallet_id); end
       let(:only_finalized) { false }
 
       it 'returns one output' do
-        allow(internal_wallet).to receive(:list_unspent).with(Tapyrus::Color::ColorIdentifier.default, false, nil).and_return(unspents.select{ |u| !u[:color_id]})
+        allow(internal_wallet).to receive(:list_unspent).with(false, nil, color_id: Tapyrus::Color::ColorIdentifier.default).and_return(unspents.select{ |u| !u[:color_id]})
         expect(subject[0]).to eq 250_000_000
         expect(subject[1].size).to eq 3
       end
@@ -303,8 +303,8 @@ def load_wallet(wallet_id); end
 
     before do
       allow(internal_wallet).to receive(:list_unspent).and_return(unspents)
-      allow(internal_wallet).to receive(:list_unspent).with(Tapyrus::Color::ColorIdentifier.default, false, nil).and_return(unspents.select{ |u| !u[:color_id]})
-      allow(internal_wallet).to receive(:list_unspent).with(color_id, false, nil).and_return(unspents.select{ |u| u[:color_id] == color_id.to_hex })
+      allow(internal_wallet).to receive(:list_unspent).with(false, nil, color_id: Tapyrus::Color::ColorIdentifier.default).and_return(unspents.select{ |u| !u[:color_id]})
+      allow(internal_wallet).to receive(:list_unspent).with(false, nil, color_id: color_id).and_return(unspents.select{ |u| u[:color_id] == color_id.to_hex })
     end
 
     it 'returns one output' do
@@ -542,7 +542,7 @@ def load_wallet(wallet_id); end
   end
 
   describe "#list_unspent_with_count" do
-    subject { wallet.list_unspent_with_count(color_id) }
+    subject { wallet.list_unspent_with_count(color_id: color_id) }
 
     let(:color_id) { Tapyrus::Color::ColorIdentifier.parse_from_payload('c150ad685ec8638543b2356cb1071cf834fb1c84f5fa3a71699c3ed7167dfcdbb3'.htb) }
 
@@ -551,7 +551,7 @@ def load_wallet(wallet_id); end
 
       subject
 
-      expect(Glueby::Internal::Wallet.wallet_adapter).to have_received(:list_unspent_with_count).with(wallet.id, color_id, true, nil, 1, 25)
+      expect(Glueby::Internal::Wallet.wallet_adapter).to have_received(:list_unspent_with_count).with(wallet.id, true, nil, color_id: color_id, page: 1, per: 25)
     end
   end
 end
\ No newline at end of file
diff --git a/spec/glueby/wallet_spec.rb b/spec/glueby/wallet_spec.rb
index fb031af..d9578f9 100644
--- a/spec/glueby/wallet_spec.rb
+++ b/spec/glueby/wallet_spec.rb
@@ -5,7 +5,7 @@ class TestWalletAdapter < Glueby::Internal::Wallet::AbstractWalletAdapter
     def create_wallet(wallet_id = nil)
       "wallet_id:1"
     end
-    def list_unspent(wallet_id, color_id = nil, only_finalized = true, label = nil)
+    def list_unspent(wallet_id, only_finalized = true, label = nil, color_id: nil)
       utxos = [
         {
           txid: '1d49c8038943d37c2723c9c7a1c4ea5c3738a9bad5827ddc41e144ba6aef36db',
@@ -157,7 +157,7 @@ def token_utxos(wallet_id, color_id, only_finalized, per, page)
     it do
       allow(Glueby::Internal::Wallet.wallet_adapter).to receive(:list_unspent_with_count).and_return([])
       subject
-      expect(Glueby::Internal::Wallet.wallet_adapter).to have_received(:list_unspent_with_count).with("wallet_id:1", color_id, only_finalized, nil, 1, 25)
+      expect(Glueby::Internal::Wallet.wallet_adapter).to have_received(:list_unspent_with_count).with("wallet_id:1", only_finalized, nil, color_id: color_id, page: 1, per: 25)
     end
   end
 end
\ No newline at end of file
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e90c103..2389007 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -250,7 +250,7 @@ def receive_address(label = nil)
     '1DBgMCNBdjQ1Ntz1vpwx2HMYJmc9kw88iT'
   end
 
-  def list_unspent(color_id = nil, only_finalized = true, label = nil)
+  def list_unspent(only_finalized = true, label = nil, color_id: nil)
     []
   end