diff --git a/mempool/config.go b/mempool/config.go
index cce200a..1932c12 100644
--- a/mempool/config.go
+++ b/mempool/config.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth/signing"
 )
 
 type (
@@ -94,11 +95,14 @@ func (config *DefaultConfig) GetTransactionSigners(tx []byte) (map[string]struct
 		return nil, err
 	}
 
+	sigTx, ok := sdkTx.(signing.SigVerifiableTx)
+	if !ok {
+		return nil, fmt.Errorf("transaction is not valid")
+	}
+
 	signers := make(map[string]struct{})
-	for _, msg := range sdkTx.GetMsgs() {
-		for _, signer := range msg.GetSigners() {
-			signers[signer.String()] = struct{}{}
-		}
+	for _, signer := range sigTx.GetSigners() {
+		signers[signer.String()] = struct{}{}
 	}
 
 	return signers, nil
diff --git a/mempool/config_test.go b/mempool/config_test.go
new file mode 100644
index 0000000..d856e2a
--- /dev/null
+++ b/mempool/config_test.go
@@ -0,0 +1,548 @@
+package mempool_test
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	testutils "github.com/skip-mev/pob/testutils"
+)
+
+func (suite *IntegrationTestSuite) TestIsAuctionTx() {
+	testCases := []struct {
+		name          string
+		createTx      func() sdk.Tx
+		isAuctionTx   bool
+		expectedError bool
+	}{
+		{
+			"normal sdk tx",
+			func() sdk.Tx {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 2, 0)
+				suite.Require().NoError(err)
+				return tx
+			},
+			false,
+			false,
+		},
+		{
+			"malformed auction bid tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				msgs := testutils.CreateRandomMsgs(suite.accounts[0].Address, 2)
+				msgs = append(msgs, msgAuctionBid)
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			false,
+			true,
+		},
+		{
+			"valid auction bid tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			true,
+			false,
+		},
+		{
+			"tx with multiple MsgAuctionBid messages",
+			func() sdk.Tx {
+				bid1, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				bid2, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 1, 2)
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{bid1, bid2}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			false,
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx := tc.createTx()
+
+			isAuctionTx, err := suite.config.IsAuctionTx(tx)
+
+			suite.Require().Equal(tc.isAuctionTx, isAuctionTx)
+			if tc.expectedError {
+				suite.Require().Error(err)
+			} else {
+				suite.Require().NoError(err)
+			}
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestGetTransactionSigners() {
+	testCases := []struct {
+		name            string
+		createTx        func() []byte
+		expectedSigners []string
+	}{
+		{
+			"normal sdk tx",
+			func() []byte {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				bz, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+				suite.Require().NoError(err)
+
+				return bz
+			},
+			[]string{suite.accounts[0].Address.String()},
+		},
+		{
+			"normal sdk tx with several messages",
+			func() []byte {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 10, 0)
+				suite.Require().NoError(err)
+
+				bz, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+				suite.Require().NoError(err)
+
+				return bz
+			},
+			[]string{suite.accounts[0].Address.String()},
+		},
+		{
+			"multiple signers on tx",
+			func() []byte {
+				tx, err := testutils.CreateTxWithSigners(suite.encCfg.TxConfig, 0, 0, suite.accounts[0:3])
+				suite.Require().NoError(err)
+
+				bz, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+				suite.Require().NoError(err)
+
+				return bz
+			},
+			[]string{suite.accounts[0].Address.String(), suite.accounts[1].Address.String(), suite.accounts[2].Address.String()},
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx := tc.createTx()
+
+			signers, err := suite.config.GetTransactionSigners(tx)
+			suite.Require().NoError(err)
+			suite.Require().Equal(len(tc.expectedSigners), len(signers))
+
+			for _, signer := range tc.expectedSigners {
+				suite.Require().Contains(signers, signer)
+			}
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestGetBundleSigners() {
+	testCases := []struct {
+		name            string
+		createBundle    func() [][]byte
+		expectedSigners [][]string
+	}{
+		{
+			"single bundle with one signer",
+			func() [][]byte {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				bz, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+				suite.Require().NoError(err)
+
+				return [][]byte{bz}
+			},
+			[][]string{{suite.accounts[0].Address.String()}},
+		},
+		{
+			"single bundle with multiple signers",
+			func() [][]byte {
+				tx, err := testutils.CreateTxWithSigners(suite.encCfg.TxConfig, 0, 0, suite.accounts[0:3])
+				suite.Require().NoError(err)
+
+				bz, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+				suite.Require().NoError(err)
+
+				return [][]byte{bz}
+			},
+			[][]string{{suite.accounts[0].Address.String(), suite.accounts[1].Address.String(), suite.accounts[2].Address.String()}},
+		},
+		{
+			"multiple bundles with one signer",
+			func() [][]byte {
+				tx1, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				bz1, err := suite.encCfg.TxConfig.TxEncoder()(tx1)
+				suite.Require().NoError(err)
+
+				tx2, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[1], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				bz2, err := suite.encCfg.TxConfig.TxEncoder()(tx2)
+				suite.Require().NoError(err)
+
+				return [][]byte{bz1, bz2}
+			},
+			[][]string{{suite.accounts[0].Address.String()}, {suite.accounts[1].Address.String()}},
+		},
+		{
+			"multiple bundles with multiple signers",
+			func() [][]byte {
+				tx1, err := testutils.CreateTxWithSigners(suite.encCfg.TxConfig, 0, 0, suite.accounts[0:3])
+				suite.Require().NoError(err)
+
+				bz1, err := suite.encCfg.TxConfig.TxEncoder()(tx1)
+				suite.Require().NoError(err)
+
+				tx2, err := testutils.CreateTxWithSigners(suite.encCfg.TxConfig, 0, 0, suite.accounts[3:6])
+				suite.Require().NoError(err)
+
+				bz2, err := suite.encCfg.TxConfig.TxEncoder()(tx2)
+				suite.Require().NoError(err)
+
+				return [][]byte{bz1, bz2}
+			},
+			[][]string{{suite.accounts[0].Address.String(), suite.accounts[1].Address.String(), suite.accounts[2].Address.String()}, {suite.accounts[3].Address.String(), suite.accounts[4].Address.String(), suite.accounts[5].Address.String()}},
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			bundle := tc.createBundle()
+
+			signers, err := suite.config.GetBundleSigners(bundle)
+			suite.Require().NoError(err)
+			suite.Require().Equal(len(tc.expectedSigners), len(signers))
+
+			for i, bundleSigners := range tc.expectedSigners {
+				suite.Require().Equal(len(bundleSigners), len(signers[i]))
+
+				for _, signer := range bundleSigners {
+					suite.Require().Contains(signers[i], signer)
+				}
+			}
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestWrapBundleTransaction() {
+	testCases := []struct {
+		name           string
+		createBundleTx func() (sdk.Tx, []byte)
+	}{
+		{
+			"normal sdk tx",
+			func() (sdk.Tx, []byte) {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				bz, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+				suite.Require().NoError(err)
+
+				return tx, bz
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx, bz := tc.createBundleTx()
+
+			wrappedTx, err := suite.config.WrapBundleTransaction(bz)
+			suite.Require().NoError(err)
+
+			txBytes, err := suite.encCfg.TxConfig.TxEncoder()(tx)
+			suite.Require().NoError(err)
+
+			wrappedTxBytes, err := suite.encCfg.TxConfig.TxEncoder()(wrappedTx)
+			suite.Require().NoError(err)
+
+			suite.Require().Equal(txBytes, wrappedTxBytes)
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestGetBidder() {
+	testCases := []struct {
+		name           string
+		createTx       func() sdk.Tx
+		expectedBidder string
+		expectedError  bool
+	}{
+		{
+			"normal sdk tx",
+			func() sdk.Tx {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				return tx
+			},
+			"",
+			true,
+		},
+		{
+			"valid auction tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			suite.accounts[0].Address.String(),
+			false,
+		},
+		{
+			"invalid auction tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				randomMsg := testutils.CreateRandomMsgs(suite.accounts[0].Address, 1)[0]
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid, randomMsg}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			"",
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx := tc.createTx()
+
+			bidder, err := suite.config.GetBidder(tx)
+			if tc.expectedError {
+				suite.Require().Error(err)
+			} else {
+				suite.Require().NoError(err)
+				suite.Require().Equal(tc.expectedBidder, bidder.String())
+			}
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestGetBid() {
+	testCases := []struct {
+		name          string
+		createTx      func() sdk.Tx
+		expectedBid   sdk.Coin
+		expectedError bool
+	}{
+		{
+			"normal sdk tx",
+			func() sdk.Tx {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				return tx
+			},
+			sdk.Coin{},
+			true,
+		},
+		{
+			"valid auction tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			sdk.NewInt64Coin("foo", 100),
+			false,
+		},
+		{
+			"invalid auction tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				randomMsg := testutils.CreateRandomMsgs(suite.accounts[0].Address, 1)[0]
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid, randomMsg}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			sdk.Coin{},
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx := tc.createTx()
+
+			bid, err := suite.config.GetBid(tx)
+			if tc.expectedError {
+				suite.Require().Error(err)
+			} else {
+				suite.Require().NoError(err)
+				suite.Require().Equal(tc.expectedBid, bid)
+			}
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestGetBundledTransactions() {
+	testCases := []struct {
+		name          string
+		createTx      func() (sdk.Tx, [][]byte)
+		expectedError bool
+	}{
+		{
+			"normal sdk tx",
+			func() (sdk.Tx, [][]byte) {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 0)
+				suite.Require().NoError(err)
+
+				return tx, nil
+			},
+			true,
+		},
+		{
+			"valid auction tx",
+			func() (sdk.Tx, [][]byte) {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx, msgAuctionBid.Transactions
+			},
+			false,
+		},
+		{
+			"invalid auction tx",
+			func() (sdk.Tx, [][]byte) {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				randomMsg := testutils.CreateRandomMsgs(suite.accounts[0].Address, 1)[0]
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid, randomMsg}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 0, msgs)
+				suite.Require().NoError(err)
+				return tx, nil
+			},
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx, expectedBundledTxs := tc.createTx()
+
+			bundledTxs, err := suite.config.GetBundledTransactions(tx)
+			if tc.expectedError {
+				suite.Require().Error(err)
+			} else {
+				suite.Require().NoError(err)
+				suite.Require().Equal(expectedBundledTxs, bundledTxs)
+			}
+		})
+	}
+}
+
+func (suite *IntegrationTestSuite) TestGetTimeout() {
+	testCases := []struct {
+		name            string
+		createTx        func() sdk.Tx
+		expectedError   bool
+		expectedTimeout uint64
+	}{
+		{
+			"normal sdk tx",
+			func() sdk.Tx {
+				tx, err := testutils.CreateRandomTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 1, 1)
+				suite.Require().NoError(err)
+
+				return tx
+			},
+			false,
+			1,
+		},
+		{
+			"valid auction tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 10, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			false,
+			10,
+		},
+		{
+			"invalid auction tx",
+			func() sdk.Tx {
+				msgAuctionBid, err := testutils.CreateMsgAuctionBid(suite.encCfg.TxConfig, suite.accounts[0], sdk.NewInt64Coin("foo", 100), 0, 2)
+				suite.Require().NoError(err)
+
+				randomMsg := testutils.CreateRandomMsgs(suite.accounts[0].Address, 1)[0]
+				suite.Require().NoError(err)
+
+				msgs := []sdk.Msg{msgAuctionBid, randomMsg}
+
+				tx, err := testutils.CreateTx(suite.encCfg.TxConfig, suite.accounts[0], 0, 10, msgs)
+				suite.Require().NoError(err)
+				return tx
+			},
+			false,
+			10,
+		},
+	}
+
+	for _, tc := range testCases {
+		suite.Run(tc.name, func() {
+			tx := tc.createTx()
+
+			timeout, err := suite.config.GetTimeout(tx)
+			if tc.expectedError {
+				suite.Require().Error(err)
+			} else {
+				suite.Require().NoError(err)
+				suite.Require().Equal(tc.expectedTimeout, timeout)
+			}
+		})
+	}
+}
diff --git a/mempool/mempool_test.go b/mempool/mempool_test.go
index 33db26e..86ca9c9 100644
--- a/mempool/mempool_test.go
+++ b/mempool/mempool_test.go
@@ -19,6 +19,7 @@ type IntegrationTestSuite struct {
 	suite.Suite
 
 	encCfg   testutils.EncodingConfig
+	config   mempool.Config
 	mempool  *mempool.AuctionMempool
 	ctx      sdk.Context
 	random   *rand.Rand
@@ -33,13 +34,13 @@ func TestMempoolTestSuite(t *testing.T) {
 func (suite *IntegrationTestSuite) SetupTest() {
 	// Mempool setup
 	suite.encCfg = testutils.CreateTestEncodingConfig()
-	config := mempool.NewDefaultConfig(suite.encCfg.TxConfig.TxDecoder())
-	suite.mempool = mempool.NewAuctionMempool(suite.encCfg.TxConfig.TxDecoder(), suite.encCfg.TxConfig.TxEncoder(), 0, config)
+	suite.config = mempool.NewDefaultConfig(suite.encCfg.TxConfig.TxDecoder())
+	suite.mempool = mempool.NewAuctionMempool(suite.encCfg.TxConfig.TxDecoder(), suite.encCfg.TxConfig.TxEncoder(), 0, suite.config)
 	suite.ctx = sdk.NewContext(nil, cmtproto.Header{}, false, log.NewNopLogger())
 
 	// Init accounts
 	suite.random = rand.New(rand.NewSource(time.Now().Unix()))
-	suite.accounts = testutils.RandomAccounts(suite.random, 5)
+	suite.accounts = testutils.RandomAccounts(suite.random, 10)
 
 	suite.nonces = make(map[string]uint64)
 	for _, acc := range suite.accounts {
diff --git a/testutils/utils.go b/testutils/utils.go
index cea9413..446f8f4 100644
--- a/testutils/utils.go
+++ b/testutils/utils.go
@@ -125,6 +125,36 @@ func CreateRandomTx(txCfg client.TxConfig, account Account, nonce, numberMsgs, t
 	return txBuilder.GetTx(), nil
 }
 
+func CreateTxWithSigners(txCfg client.TxConfig, nonce, timeout uint64, signers []Account) (authsigning.Tx, error) {
+	msgs := []sdk.Msg{}
+	for _, signer := range signers {
+		msg := CreateRandomMsgs(signer.Address, 1)
+		msgs = append(msgs, msg...)
+	}
+
+	txBuilder := txCfg.NewTxBuilder()
+	if err := txBuilder.SetMsgs(msgs...); err != nil {
+		return nil, err
+	}
+
+	sigV2 := signing.SignatureV2{
+		PubKey: signers[0].PrivKey.PubKey(),
+		Data: &signing.SingleSignatureData{
+			SignMode:  txCfg.SignModeHandler().DefaultMode(),
+			Signature: nil,
+		},
+		Sequence: nonce,
+	}
+
+	if err := txBuilder.SetSignatures(sigV2); err != nil {
+		return nil, err
+	}
+
+	txBuilder.SetTimeoutHeight(timeout)
+
+	return txBuilder.GetTx(), nil
+}
+
 func CreateAuctionTxWithSigners(txCfg client.TxConfig, bidder Account, bid sdk.Coin, nonce, timeout uint64, signers []Account) (authsigning.Tx, error) {
 	bidMsg := &buildertypes.MsgAuctionBid{
 		Bidder:       bidder.Address.String(),