fix: price tokens on optimism mainnet using DAI

src/constants/tokens.ts

@@ -30,6 +30,13 @@ export const USDC_ARBITRUM = new Token(
   'USDC',
   'USD//C'
 )
+export const DAI_OPTIMISM = new Token(
+  SupportedChainId.OPTIMISM,
+  '0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1',
+  18,
+  'DAI',
+  'Dai stable coin'
+)
 export const USDT = new Token(
   SupportedChainId.MAINNET,
   '0xdAC17F958D2ee523a2206206994597C13D831ec7',

src/hooks/useUSDCPrice.ts

 import { Currency, CurrencyAmount, Price, Token } from '@uniswap/sdk-core'
 import { useMemo } from 'react'
 import { SupportedChainId } from '../constants/chains'
-import { USDC, USDC_ARBITRUM } from '../constants/tokens'
+import { DAI_OPTIMISM, USDC, USDC_ARBITRUM } from '../constants/tokens'
 import { useV2TradeExactOut } from './useV2Trade'
 import { useBestV3TradeExactOut } from './useBestV3Trade'
 import { useActiveWeb3React } from './web3'
@@ -11,6 +11,7 @@ import { useActiveWeb3React } from './web3'
 const STABLECOIN_AMOUNT_OUT: { [chainId: number]: CurrencyAmount<Token> } = {
   [SupportedChainId.MAINNET]: CurrencyAmount.fromRawAmount(USDC, 100_000e6),
   [SupportedChainId.ARBITRUM_ONE]: CurrencyAmount.fromRawAmount(USDC_ARBITRUM, 10_000e6),
+  [SupportedChainId.OPTIMISM]: CurrencyAmount.fromRawAmount(DAI_OPTIMISM, 10_000e18),
 }
 
 /**