diff --git a/rpc/eth_api.go b/rpc/eth_api.go
index 12a0a66e..22eef209 100644
--- a/rpc/eth_api.go
+++ b/rpc/eth_api.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"log"
 	"math/big"
+	"strconv"
 	"strings"
 	"sync"
 
@@ -67,6 +68,17 @@ func (e *PublicEthAPI) ProtocolVersion() hexutil.Uint {
 	return hexutil.Uint(version.ProtocolVersion)
 }
 
+// ChainId returns the chain's identifier in hex format
+func (e *PublicEthAPI) ChainId() (hexutil.Uint, error) { // nolint
+	// parse the chainID from a integer string
+	intChainID, err := strconv.ParseUint(e.cliCtx.ChainID, 0, 64)
+	if err != nil {
+		return 0, fmt.Errorf("invalid chainID: %s, must be integer format", e.cliCtx.ChainID)
+	}
+
+	return hexutil.Uint(intChainID), nil
+}
+
 // Syncing returns whether or not the current node is syncing with other peers. Returns false if not, or a struct
 // outlining the state of the sync if it is.
 func (e *PublicEthAPI) Syncing() (interface{}, error) {
diff --git a/tests/rpc_test.go b/tests/rpc_test.go
index fde00618..e3cf506d 100644
--- a/tests/rpc_test.go
+++ b/tests/rpc_test.go
@@ -130,6 +130,15 @@ func TestEth_protocolVersion(t *testing.T) {
 	require.Equal(t, expectedRes, res, "expected: %s got: %s\n", expectedRes.String(), rpcRes.Result)
 }
 
+func TestEth_chainId(t *testing.T) {
+	rpcRes := call(t, "eth_chainId", []string{})
+
+	var res hexutil.Uint
+	err := res.UnmarshalJSON(rpcRes.Result)
+	require.NoError(t, err)
+	require.NotEqual(t, "0x0", res.String())
+}
+
 func TestEth_blockNumber(t *testing.T) {
 	rpcRes := call(t, "eth_blockNumber", []string{})