diff --git a/mainnet/balance-config-mainnet.json b/mainnet/balance-config-mainnet.json
index bd9c08b..175936e 100644
--- a/mainnet/balance-config-mainnet.json
+++ b/mainnet/balance-config-mainnet.json
@@ -384,5 +384,55 @@
       }
     ],
     "assetBalanceData": []
+  },
+  {
+    "id": 8,
+    "chainId": 8333,
+    "url": "",
+    "type": "evm",
+    "nativeTokenMinBalance": "0.01",
+    "nativeBalanceData": [
+      {
+        "address": "0x8be30312f8eBc22F46c7f06F9913C52ef7690345",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x181b05D98dCCB9e38cf51fd30F4A225De79A3366",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0xa67bF22Df59071E57b0E345161bCDFcd436eD769",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x8f18154c57D2AFB1E12224788b366c5Da17Ef3E7",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x31404a0ece67Dd8b374C3088a76A5DcAC7D4BF37",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x34D92E33c9973277a83B105B1C45c9579F71C98E",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x580549E46b62929182aCfbCB93544A0f213405a2",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x96c3b060D85F75928CE057AD423BA8EfE778C4d1",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0x8CfB285eE7E35a37708D81D019e896e38DA37Bfe",
+        "topic": "MAINNET-relayer-low-balance"
+      },
+      {
+        "address": "0xE3598C0114dbDD9b953F171b341eA11dd9F72185",
+        "topic": "MAINNET-relayer-low-balance"
+      }
+    ],
+    "assetBalanceData": []
   }
 ]
\ No newline at end of file
diff --git a/mainnet/shared-config-mainnet.json b/mainnet/shared-config-mainnet.json
index 001d0ef..48bf8a0 100644
--- a/mainnet/shared-config-mainnet.json
+++ b/mainnet/shared-config-mainnet.json
@@ -274,6 +274,44 @@
           "decimals": 18
         }
       ]
+    },
+    {
+      "id": 8,
+      "chainId": 8333,
+      "name": "b3",
+      "type": "evm",
+      "bridge": "0xC47468aeae431f5D0B7DA50F9f5D8a6c0eca4789",
+      "handlers": [
+        {
+          "type": "erc20",
+          "address": "0xe43F8245249d7fAF46408723Ab36D071dD85D7BB"
+        },
+        {
+          "type": "permissionlessGeneric",
+          "address": "0x2e1eE4153ad2F763ab8C612415AcF0DEe02Bc79B"
+        }
+      ],
+      "nativeTokenSymbol": "eth",
+      "nativeTokenFullName": "ether",
+      "nativeTokenDecimals": 18,
+      "blockConfirmations": 5,
+      "startBlock": 730061,
+      "feeRouter": "0x4EE82A64Aa9535AE4aABe3B35a12c29a0430A951",
+      "feeHandlers": [
+        {
+          "address": "0x73aB792E6AdF236879a0A2AB1597fa221E736a0d",
+          "type": "basic"
+        }
+      ],
+      "resources": [
+        {
+          "resourceId": "0x0000000000000000000000000000000000000000000000000000000000000000",
+          "type": "permissionlessGeneric",
+          "address": "",
+          "symbol": "",
+          "decimals": 18
+        }
+      ]
     }
   ]
 }