diff --git a/.changeset/thirty-plants-scream.md b/.changeset/thirty-plants-scream.md
new file mode 100644
index 0000000000..761c772ab3
--- /dev/null
+++ b/.changeset/thirty-plants-scream.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added B3 chain
diff --git a/src/chains/definitions/b3.ts b/src/chains/definitions/b3.ts
new file mode 100644
index 0000000000..4af7d78eff
--- /dev/null
+++ b/src/chains/definitions/b3.ts
@@ -0,0 +1,25 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+const sourceId = 8453 // base
+
+export const b3 = /*#__PURE__*/ defineChain({
+  id: 8333,
+  name: 'B3',
+  nativeCurrency: {
+    name: 'Ether',
+    symbol: 'ETH',
+    decimals: 18,
+  },
+  rpcUrls: {
+    default: {
+      http: ['https://mainnet-rpc.b3.fun/http'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Blockscout',
+      url: 'https://explorer.b3.fun',
+    },
+  },
+  sourceId,
+})
diff --git a/src/chains/definitions/b3Sepolia.ts b/src/chains/definitions/b3Sepolia.ts
index 74e4a16419..f832a571a9 100644
--- a/src/chains/definitions/b3Sepolia.ts
+++ b/src/chains/definitions/b3Sepolia.ts
@@ -12,7 +12,7 @@ export const b3Sepolia = /*#__PURE__*/ defineChain({
   },
   rpcUrls: {
     default: {
-      http: ['https://sepolia.b3.fun'],
+      http: ['https://sepolia.b3.fun/http'],
     },
   },
   blockExplorers: {
diff --git a/src/chains/index.ts b/src/chains/index.ts
index b37eae6cc1..f47a86f5c3 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -25,6 +25,7 @@ export { auroria } from './definitions/auroria.js'
 export { avalanche } from './definitions/avalanche.js'
 export { avalancheFuji } from './definitions/avalancheFuji.js'
 export { b3Sepolia } from './definitions/b3Sepolia.js'
+export { b3 } from './definitions/b3.js'
 export { bahamut } from './definitions/bahamut.js'
 export { base } from './definitions/base.js'
 export { baseGoerli } from './definitions/baseGoerli.js'