Where is the IBancerPool or what was it moved

I asked chatgpt to help me but it seems to be completely confused it is referencing IBalancerPool.sol that doesn’t exist. Maybe it did exist and the infromation it has is out of date. Anyway just trying to write a solidity function to get a current price quote for a token pair (e.g. WETH/DAI). Should not be this difficult to figure this out but apparently it is. Trying to install the libraries into foundry but there doesn’t appear to be any way in the hundreds of interfaces in there. I am confused. I was able to do this in uniswap and kyberswap just fine. I am looking to do this in as many dexes as I can find. Anybody in there actually have a clue. I will find the answer before someone answers me, most probably.