diff --git a/.changeset/shaggy-ducks-give.md b/.changeset/shaggy-ducks-give.md
new file mode 100644
index 0000000000..3e5c45d979
--- /dev/null
+++ b/.changeset/shaggy-ducks-give.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Swapped defunct Ankr RPC URLs for Thirdweb
diff --git a/site/pages/docs/ethers-migration.mdx b/site/pages/docs/ethers-migration.mdx
index 65562361d0..c8b52e18f2 100644
--- a/site/pages/docs/ethers-migration.mdx
+++ b/site/pages/docs/ethers-migration.mdx
@@ -47,7 +47,7 @@ Custom Chain:
 ```ts 
 import { providers } from 'ethers'
 
-const provider = new providers.JsonRpcProvider('https://rpc.ankr.com/fantom/​', { // [!code hl]
+const provider = new providers.JsonRpcProvider('https://250.rpc.thirdweb.com', { // [!code hl]
   name: 'Fantom', // [!code hl]
   id: 250 // [!code hl]
 }) // [!code hl]
@@ -74,7 +74,7 @@ import { fantom } from 'viem/chains'
 
 const client = createPublicClient({ // [!code hl]
   chain: fantom, // [!code hl]
-  transport: http('https://rpc.ankr.com/fantom/​') // [!code hl]
+  transport: http('https://250.rpc.thirdweb.com') // [!code hl]
 }) // [!code hl]
 ```
 
diff --git a/site/pages/docs/getting-started.mdx b/site/pages/docs/getting-started.mdx
index 084b012e15..2bf3fff1eb 100644
--- a/site/pages/docs/getting-started.mdx
+++ b/site/pages/docs/getting-started.mdx
@@ -46,7 +46,7 @@ const client = createPublicClient({ // [!code focus]
 ```
 
 :::info
-In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Ankr, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
+In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Thirdweb, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
 :::
 
 ### 2. Consume Actions
diff --git a/site/pages/experimental.mdx b/site/pages/experimental.mdx
index 1bef666c5c..add926065f 100644
--- a/site/pages/experimental.mdx
+++ b/site/pages/experimental.mdx
@@ -31,7 +31,7 @@ const client = createWalletClient({ // [!code focus]
 ```
 
 :::info
-In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Ankr, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
+In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Thirdweb, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
 :::
 
 ### 2. Extend Client with Experimental Actions
@@ -76,4 +76,4 @@ const id = await client.sendCalls({ // [!code focus]
     }, // [!code focus]
   ] // [!code focus]
 }) // [!code focus]
-```
\ No newline at end of file
+```
diff --git a/site/pages/op-stack.mdx b/site/pages/op-stack.mdx
index 675775dd2d..e8dfebbb99 100644
--- a/site/pages/op-stack.mdx
+++ b/site/pages/op-stack.mdx
@@ -25,7 +25,7 @@ const client = createPublicClient({ // [!code focus]
 ```
 
 :::info
-In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Ankr, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
+In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Thirdweb, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
 :::
 
 ### 2. Extend Client with the OP Stack
@@ -61,4 +61,4 @@ const l1Gas = await client.estimateL1Gas({ // [!code hl]
   to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8', // [!code hl]
   value: parseEther('1') // [!code hl]
 }) // [!code hl]
-```
\ No newline at end of file
+```
diff --git a/src/chains/definitions/bsc.ts b/src/chains/definitions/bsc.ts
index 17a68a3cf9..29b48e1840 100644
--- a/src/chains/definitions/bsc.ts
+++ b/src/chains/definitions/bsc.ts
@@ -9,7 +9,7 @@ export const bsc = /*#__PURE__*/ defineChain({
     symbol: 'BNB',
   },
   rpcUrls: {
-    default: { http: ['https://rpc.ankr.com/bsc'] },
+    default: { http: ['https://56.rpc.thirdweb.com'] },
   },
   blockExplorers: {
     default: {
diff --git a/src/chains/definitions/btr.ts b/src/chains/definitions/btr.ts
index 1da7a4d474..6e2eefee9a 100644
--- a/src/chains/definitions/btr.ts
+++ b/src/chains/definitions/btr.ts
@@ -10,11 +10,7 @@ export const btr = /*#__PURE__*/ defineChain({
   },
   rpcUrls: {
     default: {
-      http: [
-        'https://rpc.bitlayer.org',
-        'https://rpc.bitlayer-rpc.com',
-        'https://rpc.ankr.com/bitlayer',
-      ],
+      http: ['https://rpc.bitlayer.org', 'https://rpc.bitlayer-rpc.com'],
       webSocket: ['wss://ws.bitlayer.org', 'wss://ws.bitlayer-rpc.com'],
     },
   },
diff --git a/src/chains/definitions/chiliz.ts b/src/chains/definitions/chiliz.ts
index c187502b48..e5edbb992b 100644
--- a/src/chains/definitions/chiliz.ts
+++ b/src/chains/definitions/chiliz.ts
@@ -11,10 +11,7 @@ export const chiliz = /*#__PURE__*/ defineChain({
   },
   rpcUrls: {
     default: {
-      http: [
-        'https://rpc.ankr.com/chiliz',
-        'https://chiliz-rpc.publicnode.com',
-      ],
+      http: ['https://chiliz-rpc.publicnode.com'],
     },
   },
   blockExplorers: {
diff --git a/src/chains/definitions/corn.ts b/src/chains/definitions/corn.ts
index 50ad405fb4..d4d3a491f0 100644
--- a/src/chains/definitions/corn.ts
+++ b/src/chains/definitions/corn.ts
@@ -11,7 +11,7 @@ export const corn = /*#__PURE__*/ defineChain({
     symbol: 'BTCN',
   },
   rpcUrls: {
-    default: { http: ['https://rpc.ankr.com/corn_maizenet'] },
+    default: { http: ['https://21000000.rpc.thirdweb.com'] },
   },
   blockExplorers: {
     default: {
diff --git a/src/chains/definitions/cornTestnet.ts b/src/chains/definitions/cornTestnet.ts
index 64fb0d10b1..19cd9048cd 100644
--- a/src/chains/definitions/cornTestnet.ts
+++ b/src/chains/definitions/cornTestnet.ts
@@ -11,7 +11,7 @@ export const cornTestnet = /*#__PURE__*/ defineChain({
     symbol: 'BTCN',
   },
   rpcUrls: {
-    default: { http: ['https://rpc.ankr.com/corn_testnet'] },
+    default: { http: ['https://21000001.rpc.thirdweb.com'] },
   },
   blockExplorers: {
     default: {
diff --git a/src/chains/definitions/fantom.ts b/src/chains/definitions/fantom.ts
index ed9dcf1951..62b6c53ce6 100644
--- a/src/chains/definitions/fantom.ts
+++ b/src/chains/definitions/fantom.ts
@@ -9,7 +9,7 @@ export const fantom = /*#__PURE__*/ defineChain({
     symbol: 'FTM',
   },
   rpcUrls: {
-    default: { http: ['https://rpc.ankr.com/fantom'] },
+    default: { http: ['https://250.rpc.thirdweb.com'] },
   },
   blockExplorers: {
     default: {
diff --git a/src/chains/definitions/goerli.ts b/src/chains/definitions/goerli.ts
index 63addf29a9..73dcee7dbf 100644
--- a/src/chains/definitions/goerli.ts
+++ b/src/chains/definitions/goerli.ts
@@ -6,7 +6,7 @@ export const goerli = /*#__PURE__*/ defineChain({
   nativeCurrency: { name: 'Goerli Ether', symbol: 'ETH', decimals: 18 },
   rpcUrls: {
     default: {
-      http: ['https://rpc.ankr.com/eth_goerli'],
+      http: ['https://5.rpc.thirdweb.com'],
     },
   },
   blockExplorers: {
diff --git a/src/chains/definitions/harmonyOne.ts b/src/chains/definitions/harmonyOne.ts
index 4ca027592a..5adbf068f6 100644
--- a/src/chains/definitions/harmonyOne.ts
+++ b/src/chains/definitions/harmonyOne.ts
@@ -9,7 +9,7 @@ export const harmonyOne = /*#__PURE__*/ defineChain({
     decimals: 18,
   },
   rpcUrls: {
-    default: { http: ['https://rpc.ankr.com/harmony'] },
+    default: { http: ['https://1666600000.rpc.thirdweb.com'] },
   },
   blockExplorers: {
     default: {
diff --git a/src/chains/definitions/polygonMumbai.ts b/src/chains/definitions/polygonMumbai.ts
index 2dc8f8fde7..90a9c9a0ec 100644
--- a/src/chains/definitions/polygonMumbai.ts
+++ b/src/chains/definitions/polygonMumbai.ts
@@ -6,7 +6,7 @@ export const polygonMumbai = /*#__PURE__*/ defineChain({
   nativeCurrency: { name: 'MATIC', symbol: 'MATIC', decimals: 18 },
   rpcUrls: {
     default: {
-      http: ['https://rpc.ankr.com/polygon_mumbai'],
+      http: ['https://80001.rpc.thirdweb.com'],
     },
   },
   blockExplorers: {
diff --git a/src/chains/definitions/swellchain.ts b/src/chains/definitions/swellchain.ts
index c5e2e3b871..89b15d6615 100644
--- a/src/chains/definitions/swellchain.ts
+++ b/src/chains/definitions/swellchain.ts
@@ -8,10 +8,7 @@ export const swellchain = /*#__PURE__*/ defineChain({
   nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
   rpcUrls: {
     default: {
-      http: [
-        'https://swell-mainnet.alt.technology',
-        'https://rpc.ankr.com/swell',
-      ],
+      http: ['https://swell-mainnet.alt.technology'],
     },
   },
   blockExplorers: {
diff --git a/src/utils/chain/defineChain.test.ts b/src/utils/chain/defineChain.test.ts
index 075add2fa0..9e947370a4 100644
--- a/src/utils/chain/defineChain.test.ts
+++ b/src/utils/chain/defineChain.test.ts
@@ -10,7 +10,7 @@ test('default', () => {
       network: 'celo',
       nativeCurrency: { name: 'Celo', symbol: 'CELO', decimals: 18 },
       rpcUrls: {
-        default: { http: ['https://rpc.ankr.com/celo'] },
+        default: { http: ['https://42220.rpc.thirdweb.com'] },
       },
     }),
   ).toMatchInlineSnapshot(`
@@ -28,7 +28,7 @@ test('default', () => {
         "rpcUrls": {
           "default": {
             "http": [
-              "https://rpc.ankr.com/celo",
+              "https://42220.rpc.thirdweb.com",
             ],
           },
         },