feat: add Unichain Sepolia Testnet (#2840)

* Add Unichain Sepolia

* Fix ID

* Add Changeset

.changeset/lemon-kids-complain.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Add Unichain Sepolia Testnet

src/chains/definitions/unichainSepolia.ts

@@ -0,0 +1,33 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+const sourceId = 11_155_111 // sepolia
+
+export const unichainSepolia = /*#__PURE__*/ defineChain({
+  id: 1301,
+  name: 'Unichain Sepolia',
+  nativeCurrency: {
+    name: 'Ether',
+    symbol: 'ETH',
+    decimals: 18,
+  },
+  rpcUrls: {
+    default: {
+      http: ['https://sepolia.unichain.org'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Uniscan',
+      url: 'https://sepolia.uniscan.xyz',
+      apiUrl: 'https://api-sepolia.uniscan.xyz',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xca11bde05977b3631167028862be2a173976ca11',
+      blockCreated: 0,
+    },
+  },
+  testnet: true,
+  sourceId,
+})

src/chains/index.ts

@@ -347,6 +347,7 @@ export { tenet } from './definitions/tenet.js'
 export { thaiChain } from './definitions/thaiChain.js'
 export { thunderTestnet } from './definitions/thunderTestnet.js'
 export { tron } from './definitions/tron.js'
+export { unichainSepolia } from './definitions/unichainSepolia.js';
 export { unique } from './definitions/unique.js'
 export { uniqueQuartz } from './definitions/uniqueQuartz.js'
 export { uniqueOpal } from './definitions/uniqueOpal.js'