diff --git a/cmd/XDC/main.go b/cmd/XDC/main.go
index 7169f1decd92..92b131ee003e 100644
--- a/cmd/XDC/main.go
+++ b/cmd/XDC/main.go
@@ -161,6 +161,7 @@ var (
 		utils.IPCDisabledFlag,
 		utils.IPCPathFlag,
 		utils.RPCGlobalTxFeeCap,
+		utils.AllowUnprotectedTxs,
 	}
 
 	metricsFlags = []cli.Flag{
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 97b2490270fa..3f31900ac445 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -546,6 +546,11 @@ var (
 		Usage:    "Comma separated list of JavaScript files to preload into the console",
 		Category: flags.APICategory,
 	}
+	AllowUnprotectedTxs = &cli.BoolFlag{
+		Name:     "rpc.allow-unprotected-txs",
+		Usage:    "Allow for unprotected (non EIP155 signed) transactions to be submitted via RPC",
+		Category: flags.APICategory,
+	}
 
 	// Network Settings
 	MaxPeersFlag = &cli.IntFlag{
@@ -1014,6 +1019,9 @@ func setHTTP(ctx *cli.Context, cfg *node.Config) {
 	if ctx.IsSet(HTTPIdleTimeoutFlag.Name) {
 		cfg.HTTPTimeouts.IdleTimeout = ctx.Duration(HTTPIdleTimeoutFlag.Name)
 	}
+	if ctx.IsSet(AllowUnprotectedTxs.Name) {
+		cfg.AllowUnprotectedTxs = ctx.Bool(AllowUnprotectedTxs.Name)
+	}
 	cfg.HTTPCors = SplitAndTrim(ctx.String(HTTPCORSDomainFlag.Name))
 	cfg.HTTPModules = SplitAndTrim(ctx.String(HTTPApiFlag.Name))
 	cfg.HTTPVirtualHosts = SplitAndTrim(ctx.String(HTTPVirtualHostsFlag.Name))
diff --git a/eth/api_backend.go b/eth/api_backend.go
index f549ddafd636..36394ce24fda 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -54,9 +54,10 @@ import (
 
 // EthAPIBackend implements ethapi.Backend for full nodes
 type EthAPIBackend struct {
-	eth   *Ethereum
-	gpo   *gasprice.Oracle
-	XDPoS *XDPoS.XDPoS
+	allowUnprotectedTxs bool
+	eth                 *Ethereum
+	gpo                 *gasprice.Oracle
+	XDPoS               *XDPoS.XDPoS
 }
 
 func (b *EthAPIBackend) ChainConfig() *params.ChainConfig {
@@ -369,6 +370,10 @@ func (b *EthAPIBackend) EventMux() *event.TypeMux {
 	return b.eth.EventMux()
 }
 
+func (b *EthAPIBackend) UnprotectedAllowed() bool {
+	return b.allowUnprotectedTxs
+}
+
 func (b *EthAPIBackend) RPCGasCap() uint64 {
 	return b.eth.config.RPCGasCap
 }
diff --git a/eth/backend.go b/eth/backend.go
index e7f459916bb7..9fb7db42e57f 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -244,10 +244,19 @@ func New(stack *node.Node, config *ethconfig.Config, XDCXServ *XDCx.XDCX, lendin
 	eth.miner = miner.New(eth, eth.chainConfig, eth.EventMux(), eth.engine, stack.Config().AnnounceTxs)
 	eth.miner.SetExtra(makeExtraData(config.ExtraData))
 
+	var xdPoS *XDPoS.XDPoS = nil
 	if eth.chainConfig.XDPoS != nil {
-		eth.ApiBackend = &EthAPIBackend{eth, nil, eth.engine.(*XDPoS.XDPoS)}
-	} else {
-		eth.ApiBackend = &EthAPIBackend{eth, nil, nil}
+		xdPoS = eth.engine.(*XDPoS.XDPoS)
+	}
+	eth.ApiBackend = &EthAPIBackend{
+		allowUnprotectedTxs: stack.Config().AllowUnprotectedTxs,
+		eth:                 eth,
+		gpo:                 nil,
+		XDPoS:               xdPoS,
+	}
+
+	if eth.ApiBackend.allowUnprotectedTxs {
+		log.Info("Unprotected transactions allowed")
 	}
 	eth.ApiBackend.gpo = gasprice.NewOracle(eth.ApiBackend, config.GPO, config.GasPrice)
 
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 3ea76f261456..26f4e108971f 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -2304,6 +2304,10 @@ func SubmitTransaction(ctx context.Context, b Backend, tx *types.Transaction) (c
 	if err := checkTxFee(tx.GasPrice(), tx.Gas(), b.RPCTxFeeCap()); err != nil {
 		return common.Hash{}, err
 	}
+	if !b.UnprotectedAllowed() && !tx.Protected() {
+		// Ensure only eip155 signed transactions are submitted if EIP155Required is set.
+		return common.Hash{}, errors.New("only replay-protected (EIP-155) transactions allowed over RPC")
+	}
 	if err := b.SendTx(ctx, tx); err != nil {
 		return common.Hash{}, err
 	}
diff --git a/internal/ethapi/backend.go b/internal/ethapi/backend.go
index b1d81e64e7b4..5fe84d22227a 100644
--- a/internal/ethapi/backend.go
+++ b/internal/ethapi/backend.go
@@ -51,8 +51,10 @@ type Backend interface {
 	BlobBaseFee(ctx context.Context) *big.Int
 	ChainDb() ethdb.Database
 	AccountManager() *accounts.Manager
-	RPCGasCap() uint64    // global gas cap for eth_call over rpc: DoS protection
-	RPCTxFeeCap() float64 // global tx fee cap for all transaction related APIs
+	RPCGasCap() uint64        // global gas cap for eth_call over rpc: DoS protection
+	RPCTxFeeCap() float64     // global tx fee cap for all transaction related APIs
+	UnprotectedAllowed() bool // allows only for EIP155 transactions.
+
 	XDCxService() *XDCx.XDCX
 	LendingService() *XDCxlending.Lending
 
diff --git a/node/config.go b/node/config.go
index fafccf3eb49b..7ea8e4d35eb0 100644
--- a/node/config.go
+++ b/node/config.go
@@ -171,6 +171,9 @@ type Config struct {
 	oldGethResourceWarning bool
 
 	AnnounceTxs bool `toml:",omitempty"`
+
+	// AllowUnprotectedTxs allows non EIP-155 protected transactions to be send over RPC.
+	AllowUnprotectedTxs bool `toml:",omitempty"`
 }
 
 // IPCEndpoint resolves an IPC endpoint based on a configured value, taking into
diff --git a/node/rpcstack_test.go b/node/rpcstack_test.go
index e4245f420daf..5166f648ec69 100644
--- a/node/rpcstack_test.go
+++ b/node/rpcstack_test.go
@@ -258,7 +258,7 @@ func baseRpcRequest(t *testing.T, url, bodyStr string, extraHeaders ...string) *
 
 	// Create the request.
 	body := bytes.NewReader([]byte(bodyStr))
-	req, err := http.NewRequest("POST", url, body)
+	req, err := http.NewRequest(http.MethodPost, url, body)
 	if err != nil {
 		t.Fatal("could not create http request:", err)
 	}