diff --git a/.changeset/ten-candles-camp.md b/.changeset/ten-candles-camp.md
new file mode 100644
index 000000000..2642fffff
--- /dev/null
+++ b/.changeset/ten-candles-camp.md
@@ -0,0 +1,5 @@
+---
+'@reservoir0x/reservoir-sdk': patch
+---
+
+adding mainnet to custom chains export
diff --git a/packages/sdk/src/utils/customChains.ts b/packages/sdk/src/utils/customChains.ts
index dde883f1a..7e20ce9f5 100644
--- a/packages/sdk/src/utils/customChains.ts
+++ b/packages/sdk/src/utils/customChains.ts
@@ -1,42 +1,5 @@
 import { Chain } from 'viem'
 
-export const mainnet = {
-  id: 1,
-  name: 'Ethereum',
-  nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
-  rpcUrls: {
-    default: {
-      http: [
-        'https://ethereum-rpc.publicnode.com',
-        'https://mainnet.gateway.tenderly.co',
-        'https://rpc.flashbots.net',
-        'https://rpc.mevblocker.io',
-        'https://eth.drpc.org',
-      ],
-    },
-  },
-  blockExplorers: {
-    default: {
-      name: 'Etherscan',
-      url: 'https://etherscan.io',
-      apiUrl: 'https://api.etherscan.io/api',
-    },
-  },
-  contracts: {
-    ensRegistry: {
-      address: '0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e',
-    },
-    ensUniversalResolver: {
-      address: '0xce01f8eee7E479C928F8919abD53E553a36CeF67',
-      blockCreated: 19_258_213,
-    },
-    multicall3: {
-      address: '0xca11bde05977b3631167028862be2a173976ca11',
-      blockCreated: 14_353_601,
-    },
-  },
-} as const satisfies Chain
-
 export const ancient8 = {
   id: 888888888,
   name: 'Ancient8',