A place for developers to talk about building on Farcaster.

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Real World Ethereum 🌎 
building /daimo ✳️ 

is there any reference implementation of a smart contract that checks multiple dex's for the best price onchain, or is hardcoding uniswap's universal router the best approach? are there similar routers for other dex's?

cc @dcposch.eth im guessing you guys explored this for daimo

I like baking /goodbread and building apps on web3 protocols. DevRel @ ENS Labs. gregskril.com

"To avoid price manipulations within a transaction, the spot price aggregator should ONLY be used off-chain. DO NOT use it on-chain." 😔

I wonder why this is the case and if it also applies to Uniswap's UniversalRouater. I want a `sweep(address[] erc20tokens)` function that automatically swaps all shitcoins to usdc

https://github.com/1inch/spot-price-aggregator

they have offchain APIs for everything, I think for similar reasons to this

they have offchain APIs for everything, I think for similar reasons to this https://warpcast.com/greg/0x61a57a77

interesting, thanks. is this your latest version working in prod? https://github.com/daimo-eth/daimo/blob/master/packages/contract/src/DaimoUSDCSwapper.sol

any chance you can share the deployed address?

You can use Uniswap TWAP/TWAL. Unfortunately these are averages: median would be better and more resistant to manipulation.

TWAP/TWAL does have the advantage that only uses previous-block pricing = it's resistant to within-block/within-tx manimuplation

Embed swaps in your onchain app. Access 7+ million tokens with liquidity from 140+ exchanges with a single API.

https://0x.org

I don't know if this would help with your use case, but at @0xproject, we have APIs to exactly swap any shitcoin for whatever bluechip token you want, aggregating the best on-chain price among DEXs!