Update errors message and reponse format.

nodebalancer/cmd/nodebalancer/balances.go

@@ -124,13 +124,6 @@ func getBalances(ctx context.Context, address string) (BalancesResponse, error)
 				return
 			}
 
-			// Get token list for this blockchain
-			tokens := getTokenList(blockchain)
-			if len(tokens) == 0 {
-				resultChan <- chainResult{blockchain: blockchain, balances: make(ChainBalances)}
-				return
-			}
-
 			// Connect to client
 			client, err := ethclient.Dial(node.Endpoint.String())
 			if err != nil {
@@ -139,14 +132,34 @@ func getBalances(ctx context.Context, address string) (BalancesResponse, error)
 			}
 			defer client.Close()
 
-			// Try Multicall3 first
-			chainBalances, err := getBalancesMulticall(chainCtx, client, tokens, checksumAddress, blockchain)
+			// Initialize chain balances
+			chainBalances := make(ChainBalances)
+
+			// Get native token balance first
+			nativeBalance, err := client.BalanceAt(chainCtx, common.HexToAddress(checksumAddress), nil)
 			if err != nil {
-				// Fallback to individual calls
-				chainBalances, err = getBalancesFallback(chainCtx, client, tokens, checksumAddress)
+				log.Printf("Failed to get native balance for %s: %v", blockchain, err)
+			} else {
+				nativeSymbol := getNativeTokenSymbol(blockchain)
+				chainBalances[nativeSymbol] = nativeBalance.String()
+			}
+
+			// Get token list for this blockchain
+			tokens := getTokenList(blockchain)
+			if len(tokens) > 0 {
+				// Try Multicall3 first for ERC20 tokens
+				tokenBalances, err := getBalancesMulticall(chainCtx, client, tokens, checksumAddress, blockchain)
 				if err != nil {
-					resultChan <- chainResult{blockchain: blockchain, err: err}
-					return
+					// Fallback to individual calls
+					tokenBalances, err = getBalancesFallback(chainCtx, client, tokens, checksumAddress)
+					if err != nil {
+						resultChan <- chainResult{blockchain: blockchain, err: err}
+						return
+					}
+				}
+				// Merge token balances into chain balances
+				for token, balance := range tokenBalances {
+					chainBalances[token] = balance
 				}
 			}
 
@@ -236,3 +249,10 @@ func getTokenList(blockchain string) []string {
 	}
 	return nil
 }
+
+func getNativeTokenSymbol(blockchain string) string {
+	if chain, ok := contractsConfig[blockchain]; ok {
+		return chain.NativeToken
+	}
+	return ""
+}

nodebalancer/cmd/nodebalancer/configs.go

@@ -25,6 +25,8 @@ var (
 
 	bugoutClient *bugout.BugoutClient
 
+	contractsConfig ContractsConfig
+
 	// Bugout client
 	// TODO(kompotkot): Find out why it cuts out the port
 	BUGOUT_BROOD_URL = "https://auth.bugout.dev"
@@ -171,14 +173,13 @@ type NodeConfig struct {
 type TokenConfig map[string]string
 
 type ChainConfig struct {
-	Multicall3 string      `json:"multicall3"`
-	Tokens     TokenConfig `json:"tokens"`
+	Multicall3  string      `json:"multicall3"`
+	Tokens      TokenConfig `json:"tokens"`
+	NativeToken string      `json:"native_token"`
 }
 
 type ContractsConfig map[string]ChainConfig
 
-var contractsConfig ContractsConfig
-
 func LoadConfig(configPath string) error {
 	rawBytes, err := ioutil.ReadFile(configPath)
 	if err != nil {
@@ -195,10 +196,6 @@ func LoadConfig(configPath string) error {
 
 func LoadContractsConfig(configPath string) error {
 
-	if configPath == "" {
-		return nil
-	}
-
 	// Read config file
 	data, err := os.ReadFile(filepath.Join(configPath))
 	if err != nil {

nodebalancer/cmd/nodebalancer/routes.go

@@ -130,6 +130,11 @@ func balancesRoute(w http.ResponseWriter, r *http.Request) {
 	// Get address from query params
 	address := r.URL.Query().Get("address")
 
+	if address == "" {
+		http.Error(w, "Address is required", http.StatusBadRequest)
+		return
+	}
+
 	// Check cache first
 	cacheKey := fmt.Sprintf("balances:%s", address)
 	if cachedData, found := balancesCache.Get(cacheKey); found {