This is a DeFi example witten in NextJS.

Steps to run:
copy .env-sample to .env.local
npm run dev

WalletV2:
Using bnc-onboard
WalletV3:
Using web3-onboard

It has 3 parts:

1. call 0x swap API to swap ETH to DAI
2. Call Aave smart contract to supply liquidity
3. Call Uniswap smart contract to swap erc20 tokens

Error handling:

If you see the error below, it could be because you did not have enough WETH token
Error: Fail with error 'STF'

and

If you see the error below, it means you are not using goerli on metamask wallet
Error: Could not find a USD/WETH pool for computing gas costs.