diff --git a/packages/taiko-client/proposer/transaction_builder/fallback.go b/packages/taiko-client/proposer/transaction_builder/fallback.go
index 9305e7ec69b..120017b2067 100644
--- a/packages/taiko-client/proposer/transaction_builder/fallback.go
+++ b/packages/taiko-client/proposer/transaction_builder/fallback.go
@@ -143,23 +143,33 @@ func (b *TxBuilderWithFallback) estimateCandidateCost(
 	ctx context.Context,
 	candidate *txmgr.TxCandidate,
 ) (*big.Int, error) {
-	txmgr, _ := b.txmgrSelector.Select()
-	gasTipCap, baseFee, blobBaseFee, err := txmgr.SuggestGasPriceCaps(ctx)
+	txMgr, _ := b.txmgrSelector.Select()
+	gasTipCap, baseFee, blobBaseFee, err := txMgr.SuggestGasPriceCaps(ctx)
 	if err != nil {
 		return nil, err
 	}
 	log.Debug("Suggested gas price", "gasTipCap", gasTipCap, "baseFee", baseFee, "blobBaseFee", blobBaseFee)
 
 	gasFeeCap := new(big.Int).Add(baseFee, gasTipCap)
-	gasUsed, err := b.rpc.L1.EstimateGas(ctx, ethereum.CallMsg{
-		From:      txmgr.From(),
+	msg := ethereum.CallMsg{
+		From:      txMgr.From(),
 		To:        candidate.To,
 		Gas:       candidate.GasLimit,
 		GasFeeCap: gasFeeCap,
 		GasTipCap: gasTipCap,
 		Value:     candidate.Value,
 		Data:      candidate.TxData,
-	})
+	}
+	if len(candidate.Blobs) != 0 {
+		var blobHashes []common.Hash
+		if _, blobHashes, err = txmgr.MakeSidecar(candidate.Blobs); err != nil {
+			return nil, fmt.Errorf("failed to make sidecar: %w", err)
+		}
+		msg.BlobHashes = blobHashes
+		msg.BlobGasFeeCap = blobBaseFee
+	}
+
+	gasUsed, err := b.rpc.L1.EstimateGas(ctx, msg)
 	if err != nil {
 		return nil, fmt.Errorf("failed to estimate gas used: %w", err)
 	}
diff --git a/packages/taiko-client/proposer/transaction_builder/fallback_test.go b/packages/taiko-client/proposer/transaction_builder/fallback_test.go
index 3fcd0eb63c1..8107875b6f6 100644
--- a/packages/taiko-client/proposer/transaction_builder/fallback_test.go
+++ b/packages/taiko-client/proposer/transaction_builder/fallback_test.go
@@ -30,6 +30,13 @@ func (s *TransactionBuilderTestSuite) TestBuildCalldataWithBlobAllowed() {
 	s.NotZero(len(candidate.Blobs))
 }
 
+func (s *TransactionBuilderTestSuite) TestBlobAllowed() {
+	builder := s.newTestBuilderWithFallback(false, false)
+	s.False(builder.BlobAllow())
+	builder = s.newTestBuilderWithFallback(true, false)
+	s.True(builder.BlobAllow())
+}
+
 func (s *TransactionBuilderTestSuite) newTestBuilderWithFallback(blobAllowed, fallback bool) *TxBuilderWithFallback {
 	l1ProposerPrivKey, err := crypto.ToECDSA(common.FromHex(os.Getenv("L1_PROPOSER_PRIVATE_KEY")))
 	s.Nil(err)