Finding Uniswap v3 Token Reserves

Question

In Uniswap V2, we can use SYNC event to monitor the reserve changes in a pool for token0 and token1. How can we do the same with Uniswap V3? If it can't be done through any event, what function can I call to check the reserve based on certain pool?

Answer 1

You can directly use the erc20 balanceOf function to get the reserves from a particular pool. For example,

address pairAddress = "PAIR ADDRESS OF TOKEN0 AND TOKEN1";

uint256 reserve0 = IERC20(token0).balanceOf(pairAddress);
uint256 reserve1 = IERC20(token1).balanceOf(pairAddress);

Answer 2

All available functions of uniswap v3 pool is here: https://github.com/Uniswap/uniswap-v3-core/blob/main/contracts/UniswapV3Pool.sol

function balance0() private view returns (uint256);
function balance1() private view returns (uint256);

every pool has these functions which return pool reserves.