diff --git a/src/chains.ts b/src/chains.ts
index bc0dc85..00a7b81 100644
--- a/src/chains.ts
+++ b/src/chains.ts
@@ -107,6 +107,30 @@ const CHAIN_INFORMATION = new Map<number, ChainInformation | ChainType>([
       testnet: true,
     },
   ],
+  [
+    10,
+    {
+      id: 10,
+      nativeCurrency: ETH,
+      type: 'optimism',
+      fullName: 'OP Mainnet',
+      shortName: 'Optimism',
+      explorerUrl: `https://optimistic.etherscan.io/`,
+      testnet: false,
+    },
+  ],
+  [
+    11155420,
+    {
+      id: 11155420,
+      nativeCurrency: ETH,
+      type: 'op-sepolia',
+      fullName: 'Optimism Sepolia',
+      shortName: 'OP Sepolia',
+      explorerUrl: `https://optimism-sepolia.blockscout.com/`,
+      testnet: true,
+    },
+  ],
   [
     11155111,
     {