A place for talking about the Ethereum Virtual Machine on Farcaster.

Does anyone have an implementation of “getAmountIn” for Velo v2 / Solidly “stable” pools? i.e., the inverse of this function https://github.com/velodrome-finance/contracts/blob/main/contracts/Pool.sol#L449

The curve is the curve is yx^3 + xy^3 = k.

Don't recall, but this might be helpful to draft one

https://github.com/velodrome-finance/contracts/blob/main/contracts/Router.sol#L600

Anything specific you're trying to achieve?

runloop.xyz • memo.ai (acquired by Coinbase), summify.com (acquired by Twitter) • 🇺🇸🇷🇴🇨🇦🇨🇭

Thanks! I looked around a bit, and it doesn't seem like the router/zap logic has exact-output quoting.

The use case is to calculate the input amount required to swap into an exact output amount. e.g., how much USDC do I need to get exactly 1 ETH

The universal router doesn't have it either:

The universal router doesn't have it either: https://github.com/velodrome-finance/universal-router/blob/4dbb527ff0970f6c848458cf5d60bc486bdeff0b/contracts/modules/uniswap/v2/UniswapV2Library.sol#L143

Would it make sense to add this to the router? It seems like it was intentionally left out of scope.

Yup, it would have to be implemented based on the above, sadly nothing out of the box 

If you're in our discord happy to review closer or get some more feedback from our devs