diff --git a/.changeset/good-melons-attack.md b/.changeset/good-melons-attack.md
new file mode 100644
index 0000000000..7081b907de
--- /dev/null
+++ b/.changeset/good-melons-attack.md
@@ -0,0 +1,5 @@
+---
+"viem": minor
+---
+
+Added `blockTime` to OP Stack (2s) & ZKsync (1s) chains.
diff --git a/.changeset/wild-flowers-rush.md b/.changeset/wild-flowers-rush.md
new file mode 100644
index 0000000000..0b1d4e8b98
--- /dev/null
+++ b/.changeset/wild-flowers-rush.md
@@ -0,0 +1,5 @@
+---
+"viem": minor
+---
+
+Added `blockTime` to the `Chain` type. Polling intervals are now influenced from this property (if set).
diff --git a/src/celo/chainConfig.ts b/src/celo/chainConfig.ts
index 7ab857367a..1ffb46d758 100644
--- a/src/celo/chainConfig.ts
+++ b/src/celo/chainConfig.ts
@@ -4,6 +4,7 @@ import { formatters } from './formatters.js'
 import { serializers } from './serializers.js'
 
 export const chainConfig = {
+  blockTime: 2_000,
   contracts,
   formatters,
   serializers,
diff --git a/src/clients/createClient.test.ts b/src/clients/createClient.test.ts
index 36ce354ab9..b5487f34d7 100644
--- a/src/clients/createClient.test.ts
+++ b/src/clients/createClient.test.ts
@@ -1,7 +1,7 @@
 import { assertType, describe, expect, test, vi } from 'vitest'
 
 import { anvilMainnet } from '../../test/src/anvil.js'
-import { localhost, mainnet } from '../chains/index.js'
+import { base, localhost, mainnet } from '../chains/index.js'
 import type { EIP1193RequestFn, EIP1474Methods } from '../types/eip1193.js'
 import { getAction } from '../utils/getAction.js'
 import { type Client, createClient } from './createClient.js'
@@ -455,6 +455,16 @@ describe('config', () => {
   })
 })
 
+test('behavior: cacheTime, pollingInterval based on chain.blockTime', () => {
+  const client = createClient({
+    chain: base,
+    transport: http(),
+  })
+
+  expect(client.cacheTime).toEqual(Math.floor(base.blockTime / 3))
+  expect(client.pollingInterval).toEqual(Math.floor(base.blockTime / 3))
+})
+
 describe('extends', () => {
   test('default', async () => {
     const client = createClient({
diff --git a/src/clients/createClient.ts b/src/clients/createClient.ts
index cff5be076a..e0280a3f8c 100644
--- a/src/clients/createClient.ts
+++ b/src/clients/createClient.ts
@@ -43,7 +43,7 @@ export type ClientConfig<
     | undefined
   /**
    * Time (in ms) that cached data will remain in memory.
-   * @default 4_000
+   * @default chain.blockTime / 3
    */
   cacheTime?: number | undefined
   /**
@@ -70,7 +70,7 @@ export type ClientConfig<
   name?: string | undefined
   /**
    * Frequency (in ms) for polling enabled actions & events.
-   * @default 4_000
+   * @default chain.blockTime / 3
    */
   pollingInterval?: number | undefined
   /**
@@ -216,15 +216,18 @@ export function createClient<
 export function createClient(parameters: ClientConfig): Client {
   const {
     batch,
-    cacheTime = parameters.pollingInterval ?? 4_000,
+    chain,
     ccipRead,
     key = 'base',
     name = 'Base Client',
-    pollingInterval = 4_000,
     type = 'base',
   } = parameters
 
-  const chain = parameters.chain
+  const blockTime = chain?.blockTime ?? 12_000
+  const pollingInterval =
+    parameters.pollingInterval ?? Math.floor(blockTime / 3)
+  const cacheTime = parameters.cacheTime ?? pollingInterval
+
   const account = parameters.account
     ? parseAccount(parameters.account)
     : undefined
diff --git a/src/op-stack/chainConfig.ts b/src/op-stack/chainConfig.ts
index 44e19e46d4..1a45a826f7 100644
--- a/src/op-stack/chainConfig.ts
+++ b/src/op-stack/chainConfig.ts
@@ -3,6 +3,7 @@ import { formatters } from './formatters.js'
 import { serializers } from './serializers.js'
 
 export const chainConfig = {
+  blockTime: 2_000,
   contracts,
   formatters,
   serializers,
diff --git a/src/types/chain.ts b/src/types/chain.ts
index f3b57daaec..4cd9bf72f9 100644
--- a/src/types/chain.ts
+++ b/src/types/chain.ts
@@ -28,6 +28,8 @@ export type Chain<
         default: ChainBlockExplorer
       }
     | undefined
+  /** Block time in milliseconds. */
+  blockTime?: number | undefined
   /** Collection of contracts */
   contracts?:
     | Prettify<
diff --git a/src/utils/chain/extractChain.test.ts b/src/utils/chain/extractChain.test.ts
index e69b5a8232..8cf208efb2 100644
--- a/src/utils/chain/extractChain.test.ts
+++ b/src/utils/chain/extractChain.test.ts
@@ -65,6 +65,7 @@ test('default', async () => {
           "url": "https://optimistic.etherscan.io",
         },
       },
+      "blockTime": 2000,
       "contracts": {
         "disputeGameFactory": {
           "1": {
diff --git a/src/zksync/chainConfig.ts b/src/zksync/chainConfig.ts
index 1e46b0163a..089013988f 100644
--- a/src/zksync/chainConfig.ts
+++ b/src/zksync/chainConfig.ts
@@ -3,6 +3,7 @@ import { serializers } from './serializers.js'
 import { getEip712Domain } from './utils/getEip712Domain.js'
 
 export const chainConfig = {
+  blockTime: 1_000,
   formatters,
   serializers,
   custom: {