diff --git a/airgap/api.go b/airgap/api.go
index 31edb85e..d3124134 100644
--- a/airgap/api.go
+++ b/airgap/api.go
@@ -115,17 +115,14 @@ type FilterQueryParams struct {
 }
 
 type TxMetadata struct {
-	From                common.Address
-	Nonce               uint64
-	GasPrice            *big.Int
-	GatewayFeeRecipient *common.Address
-	GatewayFee          *big.Int
-	FeeCurrency         *common.Address
-	To                  common.Address
-	Data                []byte
-	Value               *big.Int
-	Gas                 uint64
-	ChainId             *big.Int
+	From     common.Address
+	Nonce    uint64
+	GasPrice *big.Int
+	To       common.Address
+	Data     []byte
+	Value    *big.Int
+	Gas      uint64
+	ChainId  *big.Int
 }
 
 func (tm *TxMetadata) AsCallMessage() ethereum.CallMsg {
diff --git a/airgap/server/server.go b/airgap/server/server.go
index c7154465..722b6dee 100644
--- a/airgap/server/server.go
+++ b/airgap/server/server.go
@@ -126,13 +126,11 @@ func (b *airGapServerImpl) ObtainMetadata(ctx context.Context, options *airgap.T
 	}
 
 	txMetadata := airgap.TxMetadata{
-		From:                options.From,
-		Nonce:               nonce,
-		GasPrice:            gasPrice,
-		GatewayFee:          nil,
-		GatewayFeeRecipient: nil,
-		Value:               options.Value,
-		ChainId:             b.chainId,
+		From:     options.From,
+		Nonce:    nonce,
+		GasPrice: gasPrice,
+		Value:    options.Value,
+		ChainId:  b.chainId,
 	}
 
 	if options.To != nil {
diff --git a/airgap/transaction_marshall.go b/airgap/transaction_marshall.go
index 064f88de..abe5a36c 100644
--- a/airgap/transaction_marshall.go
+++ b/airgap/transaction_marshall.go
@@ -22,26 +22,20 @@ import (
 
 func (tx Transaction) MarshalJSON() ([]byte, error) {
 	var data struct {
-		From                common.Address  `json:"from"`
-		Nonce               uint64          `json:"nonce"`
-		GasPrice            *string         `json:"gasPrice,omitempty"`
-		GatewayFeeRecipient *common.Address `json:"gatewayFeeRecipient,omitempty"`
-		GatewayFee          *string         `json:"gatewayFee,omitempty"`
-		FeeCurrency         *common.Address `json:"feeCurrency,omitempty"`
-		To                  common.Address  `json:"to"`
-		Data                string          `json:"data"`
-		Value               *string         `json:"value,omitempty"`
-		Gas                 uint64          `json:"gas"`
-		ChainId             string          `json:"chainId"`
-		Signature           string          `json:"signature"`
+		From      common.Address `json:"from"`
+		Nonce     uint64         `json:"nonce"`
+		GasPrice  *string        `json:"gasPrice,omitempty"`
+		To        common.Address `json:"to"`
+		Data      string         `json:"data"`
+		Value     *string        `json:"value,omitempty"`
+		Gas       uint64         `json:"gas"`
+		ChainId   string         `json:"chainId"`
+		Signature string         `json:"signature"`
 	}
 
 	data.From = tx.From
 	data.Nonce = tx.Nonce
 	data.GasPrice = bigIntToString(tx.GasPrice)
-	data.GatewayFeeRecipient = tx.GatewayFeeRecipient
-	data.GatewayFee = bigIntToString(tx.GatewayFee)
-	data.FeeCurrency = tx.FeeCurrency
 	data.To = tx.To
 	data.Data = common.Bytes2Hex(tx.Data)
 	data.Value = bigIntToString(tx.Value)
@@ -55,18 +49,15 @@ func (tx Transaction) MarshalJSON() ([]byte, error) {
 func (tx *Transaction) UnmarshalJSON(b []byte) error {
 	var err error
 	var data struct {
-		From                common.Address  `json:"from"`
-		Nonce               uint64          `json:"nonce"`
-		GasPrice            *string         `json:"gasPrice,omitempty"`
-		GatewayFeeRecipient *common.Address `json:"gatewayFeeRecipient,omitempty"`
-		GatewayFee          *string         `json:"gatewayFee,omitempty"`
-		FeeCurrency         *common.Address `json:"feeCurrency,omitempty"`
-		To                  common.Address  `json:"to"`
-		Data                string          `json:"data"`
-		Value               *string         `json:"value,omitempty"`
-		Gas                 uint64          `json:"gas"`
-		ChainId             string          `json:"chainId"`
-		Signature           string          `json:"signature"`
+		From      common.Address `json:"from"`
+		Nonce     uint64         `json:"nonce"`
+		GasPrice  *string        `json:"gasPrice,omitempty"`
+		To        common.Address `json:"to"`
+		Data      string         `json:"data"`
+		Value     *string        `json:"value,omitempty"`
+		Gas       uint64         `json:"gas"`
+		ChainId   string         `json:"chainId"`
+		Signature string         `json:"signature"`
 	}
 
 	if err = json.Unmarshal(b, &data); err != nil {
@@ -81,12 +72,6 @@ func (tx *Transaction) UnmarshalJSON(b []byte) error {
 	if err != nil {
 		return err
 	}
-	tx.GatewayFeeRecipient = data.GatewayFeeRecipient
-	tx.GatewayFee, err = stringToBigInt(data.GatewayFee)
-	if err != nil {
-		return err
-	}
-	tx.FeeCurrency = data.FeeCurrency
 	tx.To = data.To
 	tx.Data = common.Hex2Bytes(data.Data)
 	tx.Value, err = stringToBigInt(data.Value)
diff --git a/airgap/transaction_marshall_test.go b/airgap/transaction_marshall_test.go
index 21a925e7..e535af3e 100644
--- a/airgap/transaction_marshall_test.go
+++ b/airgap/transaction_marshall_test.go
@@ -25,9 +25,6 @@ import (
 func TestTransactionMarshalling(t *testing.T) {
 	RegisterTestingT(t)
 
-	address1 := common.HexToAddress("0x11111")
-	address2 := common.HexToAddress("0x22222")
-
 	samples := []struct {
 		name   string
 		sample Transaction
@@ -36,17 +33,14 @@ func TestTransactionMarshalling(t *testing.T) {
 			name: "Complete",
 			sample: Transaction{
 				TxMetadata: &TxMetadata{
-					From:                common.HexToAddress("0x55555"),
-					Nonce:               70,
-					GasPrice:            big.NewInt(5000),
-					GatewayFeeRecipient: &address1,
-					GatewayFee:          big.NewInt(5000),
-					FeeCurrency:         &address2,
-					To:                  common.HexToAddress("0x33333"),
-					Data:                []byte{1, 2, 3},
-					Value:               big.NewInt(3000),
-					Gas:                 98,
-					ChainId:             big.NewInt(2000),
+					From:     common.HexToAddress("0x55555"),
+					Nonce:    70,
+					GasPrice: big.NewInt(5000),
+					To:       common.HexToAddress("0x33333"),
+					Data:     []byte{1, 2, 3},
+					Value:    big.NewInt(3000),
+					Gas:      98,
+					ChainId:  big.NewInt(2000),
 				},
 				Signature: []byte{1, 2, 3},
 			},
diff --git a/airgap/txmetadata_marshall.go b/airgap/txmetadata_marshall.go
index f0d43ee3..08f1adbc 100644
--- a/airgap/txmetadata_marshall.go
+++ b/airgap/txmetadata_marshall.go
@@ -22,25 +22,19 @@ import (
 
 func (tm TxMetadata) MarshalJSON() ([]byte, error) {
 	var data struct {
-		From                common.Address  `json:"from"`
-		Nonce               uint64          `json:"nonce"`
-		GasPrice            *string         `json:"gasPrice,omitempty"`
-		GatewayFeeRecipient *common.Address `json:"gatewayFeeRecipient,omitempty"`
-		GatewayFee          *string         `json:"gatewayFee,omitempty"`
-		FeeCurrency         *common.Address `json:"feeCurrency,omitempty"`
-		To                  common.Address  `json:"to"`
-		Data                string          `json:"data"`
-		Value               *string         `json:"value,omitempty"`
-		Gas                 uint64          `json:"gas"`
-		ChainId             string          `json:"chainId"`
+		From     common.Address `json:"from"`
+		Nonce    uint64         `json:"nonce"`
+		GasPrice *string        `json:"gasPrice,omitempty"`
+		To       common.Address `json:"to"`
+		Data     string         `json:"data"`
+		Value    *string        `json:"value,omitempty"`
+		Gas      uint64         `json:"gas"`
+		ChainId  string         `json:"chainId"`
 	}
 
 	data.From = tm.From
 	data.Nonce = tm.Nonce
 	data.GasPrice = bigIntToString(tm.GasPrice)
-	data.GatewayFeeRecipient = tm.GatewayFeeRecipient
-	data.GatewayFee = bigIntToString(tm.GatewayFee)
-	data.FeeCurrency = tm.FeeCurrency
 	data.To = tm.To
 	data.Data = common.Bytes2Hex(tm.Data)
 	data.Value = bigIntToString(tm.Value)
@@ -53,17 +47,14 @@ func (tm TxMetadata) MarshalJSON() ([]byte, error) {
 func (tm *TxMetadata) UnmarshalJSON(b []byte) error {
 	var err error
 	var data struct {
-		From                common.Address  `json:"from"`
-		Nonce               uint64          `json:"nonce"`
-		GasPrice            *string         `json:"gasPrice,omitempty"`
-		GatewayFeeRecipient *common.Address `json:"gatewayFeeRecipient,omitempty"`
-		GatewayFee          *string         `json:"gatewayFee,omitempty"`
-		FeeCurrency         *common.Address `json:"feeCurrency,omitempty"`
-		To                  common.Address  `json:"to"`
-		Data                string          `json:"data"`
-		Value               *string         `json:"value,omitempty"`
-		Gas                 uint64          `json:"gas"`
-		ChainId             string          `json:"chainId"`
+		From     common.Address `json:"from"`
+		Nonce    uint64         `json:"nonce"`
+		GasPrice *string        `json:"gasPrice,omitempty"`
+		To       common.Address `json:"to"`
+		Data     string         `json:"data"`
+		Value    *string        `json:"value,omitempty"`
+		Gas      uint64         `json:"gas"`
+		ChainId  string         `json:"chainId"`
 	}
 
 	if err = json.Unmarshal(b, &data); err != nil {
@@ -76,12 +67,6 @@ func (tm *TxMetadata) UnmarshalJSON(b []byte) error {
 	if err != nil {
 		return err
 	}
-	tm.GatewayFeeRecipient = data.GatewayFeeRecipient
-	tm.GatewayFee, err = stringToBigInt(data.GatewayFee)
-	if err != nil {
-		return err
-	}
-	tm.FeeCurrency = data.FeeCurrency
 	tm.To = data.To
 	tm.Data = common.Hex2Bytes(data.Data)
 	tm.Value, err = stringToBigInt(data.Value)
diff --git a/airgap/txmetadata_marshall_test.go b/airgap/txmetadata_marshall_test.go
index 30ad4ac0..4f40f0e5 100644
--- a/airgap/txmetadata_marshall_test.go
+++ b/airgap/txmetadata_marshall_test.go
@@ -25,9 +25,6 @@ import (
 func TestTxMetadataMarshalling(t *testing.T) {
 	RegisterTestingT(t)
 
-	address1 := common.HexToAddress("0x11111")
-	address2 := common.HexToAddress("0x22222")
-
 	samples := []struct {
 		name   string
 		sample TxMetadata
@@ -35,17 +32,14 @@ func TestTxMetadataMarshalling(t *testing.T) {
 		{
 			name: "Complete",
 			sample: TxMetadata{
-				From:                common.HexToAddress("0x55555"),
-				Nonce:               70,
-				GasPrice:            big.NewInt(5000),
-				GatewayFeeRecipient: &address1,
-				GatewayFee:          big.NewInt(5000),
-				FeeCurrency:         &address2,
-				To:                  common.HexToAddress("0x33333"),
-				Data:                []byte{1, 2, 3},
-				Value:               big.NewInt(3000),
-				Gas:                 98,
-				ChainId:             big.NewInt(2000),
+				From:     common.HexToAddress("0x55555"),
+				Nonce:    70,
+				GasPrice: big.NewInt(5000),
+				To:       common.HexToAddress("0x33333"),
+				Data:     []byte{1, 2, 3},
+				Value:    big.NewInt(3000),
+				Gas:      98,
+				ChainId:  big.NewInt(2000),
 			},
 		},
 		{