diff --git a/.changeset/twelve-seahorses-matter.md b/.changeset/twelve-seahorses-matter.md
new file mode 100644
index 0000000000..f0fc632212
--- /dev/null
+++ b/.changeset/twelve-seahorses-matter.md
@@ -0,0 +1,5 @@
+---
+"viem": minor
+---
+
+Add yooldo verse testnet & mainnet setting
diff --git a/src/chains/definitions/yooldoVerse.ts b/src/chains/definitions/yooldoVerse.ts
new file mode 100644
index 0000000000..9fd597bd83
--- /dev/null
+++ b/src/chains/definitions/yooldoVerse.ts
@@ -0,0 +1,18 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const yooldoVerse = /*#__PURE__*/ defineChain({
+  id: 50_005,
+  name: 'Yooldo Verse',
+  nativeCurrency: { name: 'OAS', symbol: 'OAS', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.yooldo-verse.xyz'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Yooldo Verse Explorer',
+      url: 'https://explorer.yooldo-verse.xyz',
+    },
+  },
+})
diff --git a/src/chains/definitions/yooldoVerseTestnet.ts b/src/chains/definitions/yooldoVerseTestnet.ts
new file mode 100644
index 0000000000..4617231164
--- /dev/null
+++ b/src/chains/definitions/yooldoVerseTestnet.ts
@@ -0,0 +1,19 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const yooldoVerseTestnet = /*#__PURE__*/ defineChain({
+  id: 50_006,
+  name: 'Yooldo Verse Testnet',
+  nativeCurrency: { name: 'OAS', symbol: 'OAS', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.testnet.yooldo-verse.xyz'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Yooldo Verse Testnet Explorer',
+      url: 'https://explorer.testnet.yooldo-verse.xyz',
+    },
+  },
+  testnet: true,
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 704e7842d6..8e936f3724 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -246,6 +246,8 @@ export {
 } from './definitions/xLayerTestnet.js'
 export { xLayer } from './definitions/xLayer.js'
 export { xdc } from './definitions/xdc.js'
+export { yooldoVerse } from './definitions/yooldoVerse.js'
+export { yooldoVerseTestnet } from './definitions/yooldoVerseTestnet.js'
 export { xdcTestnet } from './definitions/xdcTestnet.js'
 export { zetachain } from './definitions/zetachain.js'
 export { zetachainAthensTestnet } from './definitions/zetachainAthensTestnet.js'