How do you implement token swapping inside a DeFi wallet?

Problem Faced:
Users need built-in token swaps inside wallets, but integrating multiple DEXs (Uniswap, PancakeSwap, 1inch) is complex.

Solution:
Use Uniswap SDK or 1inch API to fetch real-time swap rates and execute token swaps.
Fetch liquidity pool data from TheGraph API.
Ensure the wallet approves the token transfer before swapping.

javascript

import { Fetcher, Route, Trade, TokenAmount, TradeType } from '@uniswap/sdk';
const DAI = new Token(ChainId.MAINNET, DAI_ADDRESS, 18);
const WETH = WETH[ChainId.MAINNET];
const pair = await Fetcher.fetchPairData(DAI, WETH, provider);
const route = new Route([pair], WETH);
const trade = new Trade(route, new TokenAmount(WETH, "1000000000000000000"), TradeType.EXACT_INPUT);
console.log(trade.executionPrice.toSignificant(6));

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