feat: add Matchain and Testnet (#2825)

* Add Matchain and Testnet

* Update matchainTestnet.ts

---------

Co-authored-by: jxom <j@wevm.dev>

.changeset/blue-cup-photo.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Matchain.

src/chains/definitions/matchain.ts

@@ -0,0 +1,20 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const matchain = /*#__PURE__*/ defineChain({
+  id: 698,
+  name: 'Matchain',
+  nativeCurrency: {
+    name: 'BNB',
+    symbol: 'BNB',
+    decimals: 18,
+  },
+  rpcUrls: {
+    default: { http: ['https://rpc.matchain.io'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Matchain Scan',
+      url: 'https://matchscan.io',
+    },
+  },
+})

src/chains/definitions/matchainTestnet.ts

@@ -0,0 +1,21 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const matchainTestnet = /*#__PURE__*/ defineChain({
+  id: 699,
+  name: 'Matchain Testnet',
+  nativeCurrency: {
+    name: 'BNB',
+    symbol: 'BNB',
+    decimals: 18,
+  },
+  rpcUrls: {
+    default: { http: ['https://testnet-rpc.matchain.io'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Matchain Scan',
+      url: 'https://testnet.matchscan.io',
+    },
+  },
+  testnet: true
+})

src/chains/index.ts

@@ -205,6 +205,8 @@ export { mantaTestnet } from './definitions/mantaTestnet.js'
 export { mantle } from './definitions/mantle.js'
 export { mantleSepoliaTestnet } from './definitions/mantleSepoliaTestnet.js'
 export { mantleTestnet } from './definitions/mantleTestnet.js'
+export { matchain } from './definitions/matchain.js'
+export { matchainTestnet } from './definitions/matchainTestnet.js'
 export { merlin } from './definitions/merlin.js'
 export { metachain } from './definitions/metachain.js'
 export { metachainIstanbul } from './definitions/metachainIstanbul.js'