diff --git a/pkg/chains/evm/evm.pb.go b/pkg/chains/evm/evm.pb.go
index ad2ce9704..93c371d7a 100644
--- a/pkg/chains/evm/evm.pb.go
+++ b/pkg/chains/evm/evm.pb.go
@@ -2579,11 +2579,12 @@ func (x *SubmitTransactionRequest) GetGasConfig() *GasConfig {
 }
 
 type SubmitTransactionReply struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	TxHash        []byte                 `protobuf:"bytes,1,opt,name=txHash,proto3" json:"txHash,omitempty"`
-	TxStatus      TxStatus               `protobuf:"varint,2,opt,name=txStatus,proto3,enum=loop.evm.TxStatus" json:"txStatus,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
+	state            protoimpl.MessageState `protogen:"open.v1"`
+	TxHash           []byte                 `protobuf:"bytes,1,opt,name=txHash,proto3" json:"txHash,omitempty"`
+	TxStatus         TxStatus               `protobuf:"varint,2,opt,name=txStatus,proto3,enum=loop.evm.TxStatus" json:"txStatus,omitempty"`
+	TxIdempotencyKey string                 `protobuf:"bytes,3,opt,name=tx_idempotency_key,json=txIdempotencyKey,proto3" json:"tx_idempotency_key,omitempty"` // idempotency key generated for this transaction
+	unknownFields    protoimpl.UnknownFields
+	sizeCache        protoimpl.SizeCache
 }
 
 func (x *SubmitTransactionReply) Reset() {
@@ -2630,6 +2631,13 @@ func (x *SubmitTransactionReply) GetTxStatus() TxStatus {
 	return TxStatus_TX_FATAL
 }
 
+func (x *SubmitTransactionReply) GetTxIdempotencyKey() string {
+	if x != nil {
+		return x.TxIdempotencyKey
+	}
+	return ""
+}
+
 type GetTransactionStatusRequest struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	TransactionId string                 `protobuf:"bytes,1,opt,name=transaction_id,json=transactionId,proto3" json:"transaction_id,omitempty"`
@@ -3038,10 +3046,11 @@ const file_evm_proto_rawDesc = "" +
 	"\x04data\x18\x02 \x01(\fR\x04data\x127\n" +
 	"\n" +
 	"gas_config\x18\x03 \x01(\v2\x13.loop.evm.GasConfigH\x00R\tgasConfig\x88\x01\x01B\r\n" +
-	"\v_gas_config\"`\n" +
+	"\v_gas_config\"\x8e\x01\n" +
 	"\x16SubmitTransactionReply\x12\x16\n" +
 	"\x06txHash\x18\x01 \x01(\fR\x06txHash\x12.\n" +
-	"\btxStatus\x18\x02 \x01(\x0e2\x12.loop.evm.TxStatusR\btxStatus\"D\n" +
+	"\btxStatus\x18\x02 \x01(\x0e2\x12.loop.evm.TxStatusR\btxStatus\x12,\n" +
+	"\x12tx_idempotency_key\x18\x03 \x01(\tR\x10txIdempotencyKey\"D\n" +
 	"\x1bGetTransactionStatusRequest\x12%\n" +
 	"\x0etransaction_id\x18\x01 \x01(\tR\rtransactionId\"g\n" +
 	"\x19GetTransactionStatusReply\x12J\n" +
diff --git a/pkg/chains/evm/evm.proto b/pkg/chains/evm/evm.proto
index 068a579d7..df5371957 100644
--- a/pkg/chains/evm/evm.proto
+++ b/pkg/chains/evm/evm.proto
@@ -322,6 +322,7 @@ message SubmitTransactionRequest {
 message SubmitTransactionReply {
   bytes txHash = 1;
   TxStatus txStatus = 2;
+  string tx_idempotency_key = 3; // idempotency key generated for this transaction
 }
 
 // TransactionStatus is an enum for the status of a transaction.
diff --git a/pkg/loop/internal/relayer/evm.go b/pkg/loop/internal/relayer/evm.go
index afc17a6ba..680a5ab15 100644
--- a/pkg/loop/internal/relayer/evm.go
+++ b/pkg/loop/internal/relayer/evm.go
@@ -56,8 +56,9 @@ func (e *EVMClient) SubmitTransaction(ctx context.Context, txRequest evmtypes.Su
 	}
 
 	return &evmtypes.TransactionResult{
-		TxStatus: evmpb.ConvertTxStatusFromProto(reply.TxStatus),
-		TxHash:   evmtypes.Hash(reply.TxHash),
+		TxStatus:         evmpb.ConvertTxStatusFromProto(reply.TxStatus),
+		TxHash:           evmtypes.Hash(reply.TxHash),
+		TxIdempotencyKey: reply.TxIdempotencyKey,
 	}, nil
 }
 
@@ -514,8 +515,9 @@ func (e *evmServer) SubmitTransaction(ctx context.Context, request *evmpb.Submit
 		return nil, err
 	}
 	return &evmpb.SubmitTransactionReply{
-		TxHash:   txResult.TxHash[:],
-		TxStatus: evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxHash:           txResult.TxHash[:],
+		TxStatus:         evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxIdempotencyKey: txResult.TxIdempotencyKey,
 	}, nil
 }
 
diff --git a/pkg/loop/internal/relayerset/evm.go b/pkg/loop/internal/relayerset/evm.go
index bf599eca3..9ce5a73cb 100644
--- a/pkg/loop/internal/relayerset/evm.go
+++ b/pkg/loop/internal/relayerset/evm.go
@@ -411,8 +411,9 @@ func (s *Server) SubmitTransaction(ctx context.Context, request *evmpb.SubmitTra
 	}
 
 	return &evmpb.SubmitTransactionReply{
-		TxHash:   txResult.TxHash[:],
-		TxStatus: evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxHash:           txResult.TxHash[:],
+		TxStatus:         evmpb.ConvertTxStatusToProto(txResult.TxStatus),
+		TxIdempotencyKey: txResult.TxIdempotencyKey,
 	}, nil
 }
 
diff --git a/pkg/types/chains/evm/evm.go b/pkg/types/chains/evm/evm.go
index d7b4f8739..bd1429d69 100644
--- a/pkg/types/chains/evm/evm.go
+++ b/pkg/types/chains/evm/evm.go
@@ -147,8 +147,9 @@ func (e *TxError) Error() string {
 
 // PLEX-1524 - Refactor this to return the Tx Hash in a Transaction type and a second return value for the TxStatus. We may even be able to return the whole transaction object instead of just the hash.
 type TransactionResult struct {
-	TxStatus TransactionStatus
-	TxHash   Hash
+	TxStatus         TransactionStatus
+	TxHash           Hash
+	TxIdempotencyKey string // Idempotency key used for tracking purposes of transactions.
 }
 
 type GasConfig struct {