diff --git a/mempool/mempool.go b/mempool/mempool.go
index d401f37f..e7cbb28d 100644
--- a/mempool/mempool.go
+++ b/mempool/mempool.go
@@ -8,6 +8,7 @@ import (
 
 	comettypes "github.com/cometbft/cometbft/types"
 	dbm "github.com/cosmos/cosmos-db"
+	"github.com/polymerdao/monomer"
 	"github.com/polymerdao/monomer/utils"
 )
 
@@ -38,6 +39,13 @@ func (p *Pool) Enqueue(userTxn comettypes.Tx) (err error) {
 	// Unfortunately, comet's DB interface doesn't support it.
 	// Moving to a different DB interface is left for future work.
 
+	// Attempt to adapt the Cosmos transaction to an Ethereum deposit transaction.
+	// If the adaptation succeeds, it indicates that the
+	// user transaction is a deposit transaction, which is not allowed in the pool.
+	if _, err := monomer.GetDepositTxs(userTxn); err == nil {
+		return errors.New("deposit txs are not allowed in the pool")
+	}
+
 	batch := p.db.NewBatch()
 	defer func() {
 		err = utils.WrapCloseErr(err, batch)
diff --git a/mempool/mempool_test.go b/mempool/mempool_test.go
index e3bc57be..deadac62 100644
--- a/mempool/mempool_test.go
+++ b/mempool/mempool_test.go
@@ -4,6 +4,8 @@ import (
 	"testing"
 
 	comettypes "github.com/cometbft/cometbft/types"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/polymerdao/monomer"
 	"github.com/polymerdao/monomer/mempool"
 	"github.com/polymerdao/monomer/testutils"
 	"github.com/stretchr/testify/assert"
@@ -22,6 +24,18 @@ func TestMempool(t *testing.T) {
 		require.Error(t, err)
 	})
 
+	t.Run("deposit transaction", func(t *testing.T) {
+		l1AttributesTx, depositTx, _ := testutils.GenerateEthTxs(t)
+		l1AttributesTxBytes, err := l1AttributesTx.MarshalBinary()
+		require.NoError(t, err)
+		depositTxBytes, err := depositTx.MarshalBinary()
+		require.NoError(t, err)
+
+		cosmosTxs, err := monomer.AdaptPayloadTxsToCosmosTxs([]hexutil.Bytes{l1AttributesTxBytes, depositTxBytes})
+		require.NoError(t, err)
+		require.ErrorContains(t, pool.Enqueue(cosmosTxs[0]), "deposit txs are not allowed in the pool")
+	})
+
 	// enqueue multiple to empty
 	for i := byte(0); i < 3; i++ {
 		require.NoError(t, pool.Enqueue(comettypes.Tx([]byte{i})))
diff --git a/x/rollup/tx/helpers/ante.go b/x/rollup/tx/helpers/ante.go
index ca8b9ce6..eb1a20ab 100644
--- a/x/rollup/tx/helpers/ante.go
+++ b/x/rollup/tx/helpers/ante.go
@@ -1,7 +1,6 @@
 package helpers
 
 import (
-	"errors"
 	"fmt"
 
 	sdktypes "github.com/cosmos/cosmos-sdk/types"
@@ -36,28 +35,22 @@ func (a *AnteHandler) AnteHandle(
 	tx sdktypes.Tx,
 	simulate bool,
 ) (sdktypes.Context, error) {
-	if _, ok := tx.(*rolluptypes.DepositsTx); ok {
+	switch tx.(type) {
+	case *rolluptypes.DepositsTx:
 		newCtx, err := rolluptx.DepositAnteHandler(ctx, tx, simulate)
 		if err != nil {
 			return newCtx, fmt.Errorf("deposit ante handle: %v", err)
 		}
-		return newCtx, nil
-	}
-
-	for _, msg := range tx.GetMsgs() {
-		if _, ok := msg.(rolluptypes.DepositMsg); ok {
-			return ctx, errors.New("transaction contains deposit message")
+		return newCtx, err
+	default: // Unfortunately, the Cosmos SDK does not export its default tx type.
+		newCtx, err := a.authAnteHandler(ctx, tx, simulate)
+		if err != nil {
+			return newCtx, fmt.Errorf("auth ante handle: %v", err)
 		}
+		newCtx, err = rolluptx.L1DataAnteHandler(newCtx, tx, a.rollupKeeper)
+		if err != nil {
+			return newCtx, fmt.Errorf("l1 data ante handle: %v", err)
+		}
+		return newCtx, nil
 	}
-
-	// need the tx decoder
-	newCtx, err := a.authAnteHandler(ctx, tx, simulate)
-	if err != nil {
-		return newCtx, fmt.Errorf("auth ante handle: %v", err)
-	}
-	newCtx, err = rolluptx.L1DataAnteHandler(newCtx, tx, a.rollupKeeper)
-	if err != nil {
-		return newCtx, fmt.Errorf("l1 data ante handle: %v", err)
-	}
-	return newCtx, nil
 }