factory address is conditional based on the chain ID

src/constants.ts

@@ -1,5 +1,16 @@
 export const FACTORY_ADDRESS = '0x1F98431c8aD98523631AE4a59f267346ea31F984'
 
+export const getChainFactoryAddress = (chainId?: number) => {
+  switch (chainId) {
+    case 8453:
+      return '0x33128a8fC17869897dcE68Ed026d694621f6FDfD'
+    case 11155111:
+      return '0x0227628f3F023bb0B980b67D528571c95c6DaC1c'
+    default:
+      return FACTORY_ADDRESS
+  }
+}
+
 export const ADDRESS_ZERO = '0x0000000000000000000000000000000000000000'
 
 export const POOL_INIT_CODE_HASH = '0xe34f199b19b2b4f47f68442619d555527d244f78a3297ea89325f843f87b8b54'

src/entities/pool.ts

@@ -1,7 +1,7 @@
 import { BigintIsh, CurrencyAmount, Price, Token } from '@uniswap/sdk-core'
 import JSBI from 'jsbi'
 import invariant from 'tiny-invariant'
-import { FACTORY_ADDRESS, FeeAmount, TICK_SPACINGS } from '../constants'
+import { FeeAmount, getChainFactoryAddress, TICK_SPACINGS } from '../constants'
 import { NEGATIVE_ONE, ONE, Q192, ZERO } from '../internalConstants'
 import { computePoolAddress } from '../utils/computePoolAddress'
 import { LiquidityMath } from '../utils/liquidityMath'
@@ -46,10 +46,13 @@ export class Pool {
     tokenB: Token,
     fee: FeeAmount,
     initCodeHashManualOverride?: string,
-    factoryAddressOverride?: string
+    chainIdOrFactoryAddressOverride?: number | string
   ): string {
+    const factoryAddress = typeof chainIdOrFactoryAddressOverride === 'string'
+      ? chainIdOrFactoryAddressOverride
+      : getChainFactoryAddress(chainIdOrFactoryAddressOverride)
     return computePoolAddress({
-      factoryAddress: factoryAddressOverride ?? FACTORY_ADDRESS,
+      factoryAddress: factoryAddress,
       fee,
       tokenA,
       tokenB,