diff --git a/pkg/client/client.go b/pkg/client/client.go
index 7491be4..b9c69d9 100644
--- a/pkg/client/client.go
+++ b/pkg/client/client.go
@@ -190,12 +190,7 @@ func (c *CallFrame) UnmarshalJSON(input []byte) error {
 	return nil
 }
 
-func (cl *ETHClient) EstimateGasFromTx(ctx context.Context, tx *gethtypes.Transaction) (uint64, error) {
-	from, err := gethtypes.LatestSignerForChainID(tx.ChainId()).Sender(tx)
-	if err != nil {
-		return 0, err
-	}
-
+func (cl *ETHClient) EstimateGasFromTx(ctx context.Context, tx *gethtypes.Transaction, from common.Address) (uint64, error) {
 	callMsg := ethereum.CallMsg{
 		From:  from,
 		To:    tx.To(),
diff --git a/pkg/relay/ethereum/signer.go b/pkg/relay/ethereum/signer.go
index 32cfb5a..c19fd8b 100644
--- a/pkg/relay/ethereum/signer.go
+++ b/pkg/relay/ethereum/signer.go
@@ -16,6 +16,7 @@ type EthereumSigner struct {
 	gethSigner gethtypes.Signer
 	addressCache common.Address
 	logger *log.RelayLogger
+	NoSign bool
 }
 
 func NewEthereumSigner(bytesSigner signer.Signer, chainID *big.Int) (*EthereumSigner, error) {
@@ -38,6 +39,7 @@ func NewEthereumSigner(bytesSigner signer.Signer, chainID *big.Int) (*EthereumSi
 		gethSigner: gethSigner,
 		addressCache: addr,
 		logger: nil,
+		NoSign: false,
 	}, nil
 }
 
@@ -58,6 +60,10 @@ func (s *EthereumSigner) Sign(address common.Address, tx *gethtypes.Transaction)
 		return nil, fmt.Errorf("unauthorized address: authorized=%v, given=%v", s.Address(), address)
 	}
 
+	if s.NoSign {
+		return tx, nil
+	}
+
 	txHash := s.gethSigner.Hash(tx)
 
 	if (s.logger != nil) {
diff --git a/pkg/relay/ethereum/tx.go b/pkg/relay/ethereum/tx.go
index e6ea895..5aa9024 100644
--- a/pkg/relay/ethereum/tx.go
+++ b/pkg/relay/ethereum/tx.go
@@ -553,7 +553,7 @@ func estimateGas(
 		logger = &log.RelayLogger{Logger: logger.With(logAttrRawTxData, hex.EncodeToString(rawTxData))}
 	}
 
-	estimatedGas, err := c.client.EstimateGasFromTx(ctx, tx)
+	estimatedGas, err := c.client.EstimateGasFromTx(ctx, tx, c.ethereumSigner.Address())
 	if err != nil {
 		if revertReason, rawErrorData, err := c.getRevertReasonFromRpcError(err); err != nil {
 			// Raw error data may be available even if revert reason isn't available.
@@ -666,7 +666,9 @@ func (iter *CallIter) buildSingleTx(ctx context.Context, c *Chain) (*CallIterBui
 	// gas estimation
 	{
 		opts.GasLimit = math.MaxUint64
+		c.ethereumSigner.NoSign = true
 		tx, err := c.BuildMessageTx(opts, iter.Current(), iter.skipUpdateClientCommitment)
+		c.ethereumSigner.NoSign = false
 		if err != nil {
 			logger.Error("failed to build tx for gas estimation", err)
 			return nil, err
@@ -710,7 +712,9 @@ func (iter *CallIter) buildMultiTx(ctx context.Context, c *Chain) (*CallIterBuil
 			logger := iter.updateLoggerMessageInfo(logger, i, 1)
 
 			// note that its nonce is not checked
+			c.ethereumSigner.NoSign = true
 			tx, err := c.BuildMessageTx(opts, iter.msgs[i], iter.skipUpdateClientCommitment)
+			c.ethereumSigner.NoSign = false
 			if err != nil {
 				logger.Error("failed to build tx for gas estimation", err)
 				return nil, err
@@ -745,7 +749,9 @@ func (iter *CallIter) buildMultiTx(ctx context.Context, c *Chain) (*CallIterBuil
 				})
 			}
 
+			c.ethereumSigner.NoSign = true
 			multiTx, err := c.multicall3.Aggregate(opts, calls)
+			c.ethereumSigner.NoSign = false
 			if err != nil {
 				return err
 			}