diff --git a/pkg/relay/ethereum/chain.go b/pkg/relay/ethereum/chain.go
index d14cc29..f1e20ca 100644
--- a/pkg/relay/ethereum/chain.go
+++ b/pkg/relay/ethereum/chain.go
@@ -47,12 +47,12 @@ type Chain struct {
 	ibcHandler *ibchandler.Ibchandler
 	multicall3 *multicall3.Multicall3
 
+	txMaxSize uint64
+
 	ethereumSigner EthereumSigner
 
 	errorRepository ErrorRepository
 
-	txMaxSize uint64
-
 	// cache
 	connectionOpenedConfirmed bool
 	allowLCFunctions          *AllowLCFunctions
@@ -61,6 +61,8 @@ type Chain struct {
 var _ core.Chain = (*Chain)(nil)
 
 func NewChain(config ChainConfig) (*Chain, error) {
+	logger := GetModuleLogger()
+
 	id := big.NewInt(int64(config.EthChainId))
 	client, err := client.NewETHClient(
 		config.RpcAddr,
@@ -107,6 +109,11 @@ func NewChain(config ChainConfig) (*Chain, error) {
 	if err != nil {
 		return nil, fmt.Errorf("failed to create error repository: %v", err)
 	}
+	txMaxSize := config.GetTxMaxSize()
+	if txMaxSize == 0 {
+		txMaxSize = 128 * 1024  // go-ethereum/core/txpool/legacypool/legacypool.go
+		logger.Info(fmt.Sprintf("txMaxSize is zero. set to %v", txMaxSize));
+	}
 
 	return &Chain{
 		config:  config,
@@ -120,7 +127,7 @@ func NewChain(config ChainConfig) (*Chain, error) {
 
 		errorRepository: errorRepository,
 
-		txMaxSize: 1024 * 128, // go-ethereum/core/txpool/legacypool/legacypool.go
+		txMaxSize: txMaxSize,
 
 		allowLCFunctions: alfs,
 	}, nil
diff --git a/pkg/relay/ethereum/config.pb.go b/pkg/relay/ethereum/config.pb.go
index 6389ec0..ac4dffe 100644
--- a/pkg/relay/ethereum/config.pb.go
+++ b/pkg/relay/ethereum/config.pb.go
@@ -46,6 +46,9 @@ type ChainConfig struct {
 	BlocksPerEventQuery uint64                  `protobuf:"varint,16,opt,name=blocks_per_event_query,json=blocksPerEventQuery,proto3" json:"blocks_per_event_query,omitempty"`
 	AbiPaths            []string                `protobuf:"bytes,17,rep,name=abi_paths,json=abiPaths,proto3" json:"abi_paths,omitempty"`
 	Multicall3Address   string                  `protobuf:"bytes,18,opt,name=multicall3_address,json=multicall3Address,proto3" json:"multicall3_address,omitempty"`
+	// Types that are valid to be assigned to XTxMaxSize:
+	//	*ChainConfig_TxMaxSize
+	XTxMaxSize isChainConfig_XTxMaxSize `protobuf_oneof:"_tx_max_size"`
 }
 
 func (m *ChainConfig) Reset()         { *m = ChainConfig{} }
@@ -81,6 +84,39 @@ func (m *ChainConfig) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_ChainConfig proto.InternalMessageInfo
 
+type isChainConfig_XTxMaxSize interface {
+	isChainConfig_XTxMaxSize()
+	MarshalTo([]byte) (int, error)
+	Size() int
+}
+
+type ChainConfig_TxMaxSize struct {
+	TxMaxSize uint64 `protobuf:"varint,19,opt,name=tx_max_size,json=txMaxSize,proto3,oneof" json:"tx_max_size,omitempty"`
+}
+
+func (*ChainConfig_TxMaxSize) isChainConfig_XTxMaxSize() {}
+
+func (m *ChainConfig) GetXTxMaxSize() isChainConfig_XTxMaxSize {
+	if m != nil {
+		return m.XTxMaxSize
+	}
+	return nil
+}
+
+func (m *ChainConfig) GetTxMaxSize() uint64 {
+	if x, ok := m.GetXTxMaxSize().(*ChainConfig_TxMaxSize); ok {
+		return x.TxMaxSize
+	}
+	return 0
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*ChainConfig) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*ChainConfig_TxMaxSize)(nil),
+	}
+}
+
 type AllowLCFunctionsConfig struct {
 	LcAddress string   `protobuf:"bytes,1,opt,name=lc_address,json=lcAddress,proto3" json:"lc_address,omitempty"`
 	AllowAll  bool     `protobuf:"varint,2,opt,name=allow_all,json=allowAll,proto3" json:"allow_all,omitempty"`
@@ -212,64 +248,66 @@ func init() {
 }
 
 var fileDescriptor_a8a57ab2f9f14837 = []byte{
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+	0x90, 0xa6, 0x1f, 0xb3, 0xf0, 0x3b, 0x39, 0xf9, 0x0e, 0xa2, 0x87, 0x21, 0xeb, 0xcb, 0xa5, 0xb8,
+	0xe1, 0xc7, 0xaf, 0xf9, 0xf8, 0x8d, 0x7c, 0x07, 0xbf, 0xd5, 0x6a, 0xa7, 0x1b, 0xe4, 0x3e, 0x5b,
+	0x60, 0x1d, 0x5a, 0xb2, 0xfb, 0xdf, 0x77, 0x4b, 0x1f, 0x11, 0xa2, 0xe6, 0x6f, 0xab, 0x7a, 0xe4,
+	0x0d, 0x35, 0x7b, 0x5a, 0xa1, 0x72, 0x1c, 0x27, 0xae, 0x14, 0xbe, 0xf1, 0x7a, 0x5c, 0xc7, 0xc0,
+	0x89, 0x52, 0xf4, 0x2b, 0xd2, 0x70, 0xa0, 0x40, 0x78, 0x63, 0x5d, 0xb4, 0x8c, 0x6d, 0xcd, 0x03,
+	0x87, 0x3f, 0x91, 0xfa, 0xf4, 0xaa, 0x03, 0x53, 0x8f, 0x72, 0xb0, 0xdc, 0x1b, 0x8b, 0x49, 0x56,
+	0xe2, 0x79, 0x80, 0xb6, 0x49, 0x33, 0x05, 0x6d, 0x72, 0xa9, 0x11, 0xaf, 0x56, 0xc9, 0x62, 0xe8,
+	0xf0, 0x8f, 0x65, 0x42, 0x3f, 0xbe, 0x20, 0xfa, 0x23, 0x39, 0xc0, 0x41, 0x61, 0x85, 0x95, 0xc6,
+	0x4a, 0x5f, 0xb2, 0x01, 0x00, 0x5e, 0x4c, 0xc6, 0xa7, 0xcd, 0xec, 0x22, 0xe3, 0x62, 0x42, 0x38,
+	0x03, 0xb8, 0x00, 0xfb, 0x82, 0xe3, 0x08, 0xdf, 0x51, 0xe1, 0x08, 0xdf, 0xfb, 0xdc, 0x11, 0x2e,
+	0xe6, 0xbe, 0x38, 0xc2, 0xdf, 0x92, 0xad, 0xaa, 0xa2, 0xc5, 0x42, 0xaa, 0xed, 0xb7, 0x81, 0xc0,
+	0xbc, 0x80, 0x73, 0xb2, 0x9e, 0x70, 0x07, 0xf3, 0xe4, 0x2b, 0x9f, 0x99, 0xbc, 0x19, 0xe4, 0xd3,
+	0xc4, 0x27, 0xe4, 0x51, 0x30, 0x1a, 0x4a, 0xe7, 0x8d, 0x2d, 0x99, 0x85, 0xb7, 0xdc, 0xa6, 0xa1,
+	0x02, 0x01, 0xda, 0x4b, 0x05, 0xb8, 0x36, 0xd7, 0xe3, 0x83, 0x01, 0xc0, 0xcb, 0x8a, 0x13, 0x23,
+	0xe5, 0x62, 0xc6, 0xa0, 0x3f, 0x90, 0xfd, 0xbb, 0x1b, 0x67, 0xc1, 0x10, 0x17, 0xe9, 0x7a, 0xbc,
+	0xb3, 0xb0, 0x73, 0xce, 0x66, 0x4e, 0xa7, 0xfc, 0xfd, 0x3f, 0xad, 0xa5, 0xf7, 0x37, 0xad, 0xda,
+	0x87, 0x9b, 0x56, 0xed, 0xef, 0x9b, 0x56, 0xed, 0xf7, 0xdb, 0xd6, 0xd2, 0x87, 0xdb, 0xd6, 0xd2,
+	0x5f, 0xb7, 0xad, 0xa5, 0x5f, 0xfa, 0x99, 0xf4, 0xc3, 0x51, 0xd2, 0x15, 0x26, 0xef, 0xa5, 0xdc,
+	0x73, 0xec, 0x4b, 0xf1, 0x64, 0xf6, 0x71, 0x3b, 0x92, 0x89, 0x38, 0xc2, 0xae, 0x8f, 0x10, 0xeb,
+	0x15, 0x57, 0x59, 0x0f, 0xcf, 0x33, 0x4a, 0xb2, 0x8a, 0x9f, 0x86, 0xe3, 0x7f, 0x03, 0x00, 0x00,
+	0xff, 0xff, 0x26, 0xd4, 0x7a, 0xa3, 0x21, 0x07, 0x00, 0x00,
 }
 
 func (m *ChainConfig) Marshal() (dAtA []byte, err error) {
@@ -292,6 +330,15 @@ func (m *ChainConfig) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.XTxMaxSize != nil {
+		{
+			size := m.XTxMaxSize.Size()
+			i -= size
+			if _, err := m.XTxMaxSize.MarshalTo(dAtA[i:]); err != nil {
+				return 0, err
+			}
+		}
+	}
 	if len(m.Multicall3Address) > 0 {
 		i -= len(m.Multicall3Address)
 		copy(dAtA[i:], m.Multicall3Address)
@@ -438,6 +485,20 @@ func (m *ChainConfig) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *ChainConfig_TxMaxSize) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *ChainConfig_TxMaxSize) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	i = encodeVarintConfig(dAtA, i, uint64(m.TxMaxSize))
+	i--
+	dAtA[i] = 0x1
+	i--
+	dAtA[i] = 0x98
+	return len(dAtA) - i, nil
+}
 func (m *AllowLCFunctionsConfig) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -674,9 +735,21 @@ func (m *ChainConfig) Size() (n int) {
 	if l > 0 {
 		n += 2 + l + sovConfig(uint64(l))
 	}
+	if m.XTxMaxSize != nil {
+		n += m.XTxMaxSize.Size()
+	}
 	return n
 }
 
+func (m *ChainConfig_TxMaxSize) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	n += 2 + sovConfig(uint64(m.TxMaxSize))
+	return n
+}
 func (m *AllowLCFunctionsConfig) Size() (n int) {
 	if m == nil {
 		return 0
@@ -1269,6 +1342,26 @@ func (m *ChainConfig) Unmarshal(dAtA []byte) error {
 			}
 			m.Multicall3Address = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 19:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TxMaxSize", wireType)
+			}
+			var v uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowConfig
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.XTxMaxSize = &ChainConfig_TxMaxSize{v}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipConfig(dAtA[iNdEx:])
diff --git a/pkg/relay/ethereum/tx.go b/pkg/relay/ethereum/tx.go
index d433f95..8d94443 100644
--- a/pkg/relay/ethereum/tx.go
+++ b/pkg/relay/ethereum/tx.go
@@ -748,7 +748,7 @@ func (iter *CallIter) buildMultiTx(ctx context.Context, c *Chain) (*CallIterBuil
 			}
 
 			if c.txMaxSize < multiTx.Size() {
-				return fmt.Errorf("tx exceeds txMaxSize");
+				return fmt.Errorf("tx size exceeds txMaxSize: tx=%v, max=%v", multiTx.Size(), c.txMaxSize)
 			}
 
 			txGasLimit, err := estimateGas(ctx, c, multiTx, 1 == count, logger)
diff --git a/proto/relayer/chains/ethereum/config/config.proto b/proto/relayer/chains/ethereum/config/config.proto
index bc77be8..54649a8 100644
--- a/proto/relayer/chains/ethereum/config/config.proto
+++ b/proto/relayer/chains/ethereum/config/config.proto
@@ -40,6 +40,8 @@ message ChainConfig {
   repeated string abi_paths = 17;
 
   string multicall3_address = 18;
+
+  optional uint64 tx_max_size = 19;
 }
 
 message AllowLCFunctionsConfig {