diff --git a/chainio/clients/eth/client.go b/chainio/clients/eth/client.go
index 709851b7..9102862c 100644
--- a/chainio/clients/eth/client.go
+++ b/chainio/clients/eth/client.go
@@ -18,6 +18,7 @@ type HttpBackend interface {
 
 	BlockNumber(ctx context.Context) (uint64, error)
 	BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)
+	ChainID(ctx context.Context) (*big.Int, error)
 }
 
 // WsBackend is the Websocket ETH Client interface
@@ -29,4 +30,5 @@ type WsBackend interface {
 
 	BlockNumber(ctx context.Context) (uint64, error)
 	BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)
+	ChainID(ctx context.Context) (*big.Int, error)
 }