update monad mainnet: add multicall3 address, websocket, second RPC url, second block explorer (#4109)

Author: keone

.changeset/modern-walls-cough.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Updated Monad block explorer URL and added WebSocket URLs, Multicall3 contract, second block explorer, and second RPC URL.

src/chains/definitions/monad.ts

@@ -11,14 +11,26 @@ export const monad = /*#__PURE__*/ defineChain({
   },
   rpcUrls: {
     default: {
-      http: ['https://rpc.monad.xyz'],
+      http: ['https://rpc.monad.xyz', 'https://rpc1.monad.xyz'],
+      webSocket: ['wss://rpc.monad.xyz', 'wss://rpc1.monad.xyz'],
     },
   },
   blockExplorers: {
     default: {
-      name: 'Monvision',
-      url: 'https://mainnet-beta.monvision.io',
+      name: 'MonadVision',
+      url: 'https://monadvision.com',
+    },
+    monadscan: {
+      name: 'Monadscan',
+      url: 'https://monadscan.com',
+      apiUrl: 'https://api.monadscan.com/api',
     },
   },
   testnet: false,
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+      blockCreated: 9248132,
+    },
+  },
 })