Add balances endpoint.

nodebalancer/README.md

@@ -143,23 +143,20 @@ The endpoint returns a JSON object with the following structure:
 
 ```json
 {
-    "balances": {
-        "ethereum": {
-            "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2": "1000000000000000000",
-            "0x6B175474E89094C44Da98b954EedeAC495271d0F": "2000000000000000000",
-            "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48": "3000000000000000"
-        },
-        "polygon": {
-            "0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270": "4000000000000000000",
-            "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174": "5000000000000000",
-            "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063": "6000000000000000000"
-        }
-    }
+	"ethereum": {
+		"0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2": "1000000000000000000",
+		"0x6B175474E89094C44Da98b954EedeAC495271d0F": "2000000000000000000",
+		"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48": "3000000000000000"
+	},
+	"polygon": {
+		"0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270": "4000000000000000000",
+		"0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174": "5000000000000000",
+		"0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063": "6000000000000000000"
+	}
 }
 ```
 
 Where:
-- The outer object contains a `balances` field mapping blockchain names to token balances
 - Each blockchain object maps token contract addresses to their respective balances
 - All balances are returned as strings in the token's smallest unit (e.g., wei for ETH)
 
@@ -167,27 +164,35 @@ Where:
 
 1. **Caching**: Responses are cached for 10 seconds to minimize blockchain RPC calls
 2. **Multicall**: Uses Multicall3 contract to batch balance queries for efficiency
-3. **Error Handling**: Individual token or blockchain failures don't affect other results
-
-### Supported Tokens
-
-#### Ethereum
-- WETH: `0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2`
-- DAI: `0x6B175474E89094C44Da98b954EedeAC495271d0F`
-- USDC: `0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48`
-
-#### Polygon
-- WMATIC: `0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270`
-- USDC: `0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174`
-- DAI: `0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063`
-
-### Error Responses
-
-- 400 Bad Request: Invalid Ethereum address
-- 500 Internal Server Error: Server-side errors
+3. **Error Handling**: Individual token or blockchain failures don't affect other 
 
 ### Example
 
 ```bash
 curl "http://localhost:8080/balances?address=0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
 ```
+
+### Contracts Config
+```json
+{
+    "ethereum": {
+        "multicall3": "0xcA11bde05977b3631167028862bE2a173976CA11",
+        "tokens": {
+            "WETH": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
+            "DAI": "0x6B175474E89094C44Da98b954EedeAC495271d0F",
+            "USDC": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
+            "USDT": "0xdAC17F958D2ee523a2206206994597C13D831ec7"
+        }
+    },
+    "polygon": {
+        "multicall3": "0xcA11bde05977b3631167028862bE2a173976CA11",
+        "tokens": {
+            "WMATIC": "0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270",
+            "USDC": "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174",
+            "DAI": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
+            "WETH": "0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619",
+            "USDT": "0xc2132D05D31c914a87C6611C10748AEb04B58e8F"
+        }
+    }
+}
+```