diff --git a/server/v2/cometbft/grpc.go b/server/v2/cometbft/grpc.go
index e85167ab496f..65a368b03a92 100644
--- a/server/v2/cometbft/grpc.go
+++ b/server/v2/cometbft/grpc.go
@@ -526,12 +526,20 @@ func (c *consensus[T]) maybeHandleExternalServices(ctx context.Context, req *abc
 	if strings.HasPrefix(req.Path, "/cosmos.tx.v1beta1.Service") {
 		rpcClient, _ := client.NewClientFromNode(c.cfg.AppTomlConfig.Address)
 
+		txConfig := authtx.NewTxConfig(
+			c.appCodecs.AppCodec,
+			c.appCodecs.AppCodec.InterfaceRegistry().SigningContext().AddressCodec(),
+			c.appCodecs.AppCodec.InterfaceRegistry().SigningContext().ValidatorAddressCodec(),
+			authtx.DefaultSignModes,
+		)
+
 		// init simple client context
 		clientCtx := client.Context{}.
 			WithLegacyAmino(c.appCodecs.LegacyAmino.(*codec.LegacyAmino)).
 			WithCodec(c.appCodecs.AppCodec).
 			WithNodeURI(c.cfg.AppTomlConfig.Address).
-			WithClient(rpcClient)
+			WithClient(rpcClient).
+			WithTxConfig(txConfig)
 
 		txService := txServer[T]{
 			clientCtx: clientCtx,
diff --git a/tests/systemtests/tx_test.go b/tests/systemtests/tx_test.go
index a1c13201f1b9..6d8074a34041 100644
--- a/tests/systemtests/tx_test.go
+++ b/tests/systemtests/tx_test.go
@@ -946,7 +946,7 @@ func TestTxDecodeAmino_GRPC(t *testing.T) {
 	}{
 		{"nil request", nil, true, "request cannot be nil"},
 		{"empty request", &tx.TxDecodeAminoRequest{}, true, "invalid empty tx bytes"},
-		{"invalid tx bytes", &tx.TxDecodeAminoRequest{AminoBinary: invalidTxBytes}, true, "invalid request"},
+		{"invalid tx bytes", &tx.TxDecodeAminoRequest{AminoBinary: invalidTxBytes}, true, "unmarshal to legacytx.StdTx failed"},
 		{"valid request with tx bytes", &tx.TxDecodeAminoRequest{AminoBinary: encodedTx}, false, ""},
 	}