Uniswap V3 - Single Hop Swap | DeFi

[@smartcontractprogrammer]

0:00 - Intro and setup 3:04 - Code swapExactInputSingle - use all input tokens, single hop 6:42 - Write test for swapExactInputSingle 13:05 - Execute test for swapExactInputSingle 13:25 - Code swapExactOutputSingle - buy exact amount of token, single hop 15:25 - Write test for swapExactOutputSingle 18:12 - Execute test for swapExactOutputSIngle Code github.com/t4sk/defi-by-example/tree/main/uni-v3 Unisvap V3 Doc docs.uniswap.org/protocol/guides/swaps/single-swaps Alchemy www.alchemy.com/ Take a course www.smartcontract.engineer/

[@ouailtayarth4012]

Love the energy in this video! Thanks for your effort.

[@gaetboot]

Hey, I noticed at some point you comment the test. Next time you can just change "it" that declares your test to "xit" Hope it can help :) Helpful video btw!

[@sdfsfsfd437]

¡¡Muy buenos tus vídeos tio!!

[@zmou2412]

finally v3

[@dbltecnologia]

nice tutorial, thank you

[@anonymousasdoasidjasd9911]

whats that json-esque syntax at 6:20 passed into ``ExactInputSingleParams``? anonymous object?

[@smartcontractprogrammer]

Struct

[@emmanuelsanchez6405]

This example should should also work on the goerli testnet?

[@smartcontractprogrammer]

probably not, token addresses may be different

[@panchopacheco1247]

Your program worked great. But erc20 tokens don't have a deposit function; how do we deposit erc20 tokens into the contract?

[@smartcontractprogrammer]

approve + deposit

[@carlosinvestor9025]

I'm trying to understand something, so does this code mean that you can make swaps on uniswap without using the website?

[@smartcontractprogrammer]

This video is meant for developers that need to interact with Uniswap V3 using Solidity

[@danis1840]

How do you you change the solidity code snippet (token addresses) to JavaScript code? Is there any shortcut for this?

[@smartcontractprogrammer]

address is string in JS "0x123...."

[@erikeberhard8220]

👍🏻

[@nikhilbaghel6115]

What is the difference between swap ETH for tokens and swap ExactETH for tokens & swap tokens for ETH and swap ExactTokens for ETH?

[@smartcontractprogrammer]

docs.uniswap.org/protocol/V2/reference/smart-contracts/router-02#swapethforexacttokens

[@princepanwar4875]

does it works with the universal router?

[@chanbi7095]

I try it and its work. But how to swap back WETH to DAI, is it must change contract again?

[@smartcontractprogrammer]

yes

[@arpitkumar7127]

I'm getting this error, Error: invalid address or ENS name (argument="name", value=undefined, code=INVALID_ARGUMENT, version=contracts/5.6.2) while executing test for swapExactInput Single.

[@smartcontractprogrammer]

test on mainnet fork

[@arpitkumar7127]

@@smartcontractprogrammer yes, that's what i did. Everything is same as in the video.

[@pierreduprey9032]

Where do you specify your private key???

[@smartcontractprogrammer]

in a secret file or for development I put in .env file

[@pierreduprey9032]

@@smartcontractprogrammer same here but I don't see it referenced in your script. I'm also getting confused, I thought you could run a script and it could perform a swap for you, but you need to deploy a smart contract first that interacts with a liquidity provider first then use remix to interact with your contract that swaps with uniswap, aave, sushiswap e.t.c. Am I right?

[@lalo6667]

how do we set account?

[@viktorcortez5706]

Hi, I have a problem with approving of dai (I'm trying to make a transaction with impersonate Fund) await dai.approve(swapExamples.address,amountIn) TypeError: Cannot read properties of undefined (reading 'approve')

[@manavkampani8367]

How are we converting Eth to Weth here?

[@smartcontractprogrammer]

in the test

[@manavkampani8367]

@@smartcontractprogrammer await weth.connect(accounts[0]).deposit({value: amountIn}); by this line of code we're depositing amountIn ETH to the WETH smart contract on the main-net and getting equivalent WETH in return?

[@Eldar_Radle]

shouldn`t u hide API key??

[@smartcontractprogrammer]

I can revoke them any time

[@notoriousFOLB]

What IDE is this?

[@smartcontractprogrammer]

VSCode

[@bundotstore9141]

I'm getting this error, Error: invalid address or ENS name (argument="name", value=undefined, code=INVALID_ARGUMENT, version=contracts/5.6.2) while executing test for swapExactInput Single.