diff --git a/apollo/.env.prod b/apollo/.env.prod
index 15ed8d01..4fefa3a7 100644
--- a/apollo/.env.prod
+++ b/apollo/.env.prod
@@ -19,5 +19,6 @@ LN_ETHEREUM_OPPOSITE_ENDPOINT=https://thegraph-g1.darwinia.network/helix/subgrap
 LN_ARBITRUM_OPPOSITE_ENDPOINT=https://thegraph-g1.darwinia.network/helix/subgraphs/name/lnopposite/arbitrum
 LN_ETHEREUM_DEFAULT_ENDPOINT=https://thegraph-g1.darwinia.network/helix/subgraphs/name/lndefault/ethereum
 LN_ARBITRUM_DEFAULT_ENDPOINT=https://thegraph-g1.darwinia.network/helix/subgraphs/name/lndefault/arbitrum
+LN_MANTLE_DEFAULT_ENDPOINT=https://thegraph-g1.darwinia.network/helix/subgraphs/name/lndefault/mantle
 
 CHAIN_TYPE=formal
diff --git a/apollo/src/lnbridgev20/transfer.service.ts b/apollo/src/lnbridgev20/transfer.service.ts
index c1f8ec91..d24b9b55 100644
--- a/apollo/src/lnbridgev20/transfer.service.ts
+++ b/apollo/src/lnbridgev20/transfer.service.ts
@@ -88,6 +88,26 @@ export class TransferService extends BaseTransferServiceT2 {
           protocolFee: 100000000000000000000,
           decimals: 18,
         },
+        {
+          symbol: 'USDT',
+          address: '0xfd086bc7cd5c481dcc9c85ebe478a1c0b69fcbb9',
+          protocolFee: 100000,
+          decimals: 6,
+        },
+      ],
+    },
+    {
+      chainId: 5000,
+      chain: 'mantle',
+      url: this.lnMantleDefaultEndpoint,
+      bridge: 'default',
+      symbols: [
+        {
+          symbol: 'USDT',
+          address: '0x201eba5cc46d216ce6dc03f6a759e8e766e956ae',
+          protocolFee: 100000,
+          decimals: 6,
+        },
       ],
     },
   ];
@@ -377,10 +397,14 @@ export class TransferService extends BaseTransferServiceT2 {
     },
     'arbitrum': {
       ethereum: 'arbitrum-l2',
+      mantle: 'layerzero',
     },
     'ethereum': {
       arbitrum: 'arbitrum-l2',
     },
+    'mantle': {
+      arbitrum: 'layerzero',
+    }
   };
   readonly isTest = this.configService.get<string>('CHAIN_TYPE') === 'test';
 
diff --git a/subgraph/ln-default-bridge/package.json b/subgraph/ln-default-bridge/package.json
index 4a6c6d11..dd50d56c 100644
--- a/subgraph/ln-default-bridge/package.json
+++ b/subgraph/ln-default-bridge/package.json
@@ -11,6 +11,7 @@
     "build-zkgoerli": "sh generate.sh zkgoerli 0xe8d55759c32fb608fD092aB2C0ef8A1F52B254d4 12529843 && graph codegen && graph build",
     "build-ethereum": "sh generate.sh ethereum 0x94C614DAeFDbf151E1BB53d6A201ae5fF56A9337 18411160 && graph codegen && graph build",
     "build-arbitrum": "sh generate.sh arbi 0x94C614DAeFDbf151E1BB53d6A201ae5fF56A9337 143123443 && graph codegen && graph build",
+    "build-mantle": "sh generate.sh mantle 0x94C614DAeFDbf151E1BB53d6A201ae5fF56A9337 17119189 && graph codegen && graph build",
     "create-remote-dev": "graph create --access-token ${KEY} --node https://thegraph-g2.darwinia.network/helix/deploy/ lndefault/${NETWORK}",
     "deploy-remote-dev": "graph deploy --access-token $KEY --node https://thegraph-g2.darwinia.network/helix/deploy/ --ipfs http://g2.generic.darwinia.network:5001/ lndefault/$NETWORK",
     "create-remote-pro": "graph create --access-token ${KEY} --node https://thegraph.darwinia.network/helix/deploy/ lndefault/${NETWORK}",