Uniswap V3 Tutorial | Uniswap Smart Contract (Single Swap) | DeFi Tutorial

In this Uniswap tutorial create a smart contract that implements a simple ERC20 token swap (Uniswap single swap) using the Uniswap V3 protocol. This DeFi tutorial explores the Uniswap V3 ISwapRouter interface for executing token swaps from Uinswap liquidity pools. Follow along and learn about this important DeFi primitive.
GitHub repo for this tutorial:
github.com/jspruance/uniswap-...
LINK:
0x326C977E6efc84E512bB9C30f76E30c160eD06FB
WETH:
0xB4FBF271143F4FBf7B91A5ded31805e42b2208d6
USDC:
0x07865c6E87B9F70255377e024ace6630C1Eaa37F
Uniswap Swap Router address:
0xE592427A0AEce92De3Edee1F18E0157C05861564
SingleSwap.sol deployed:
0xBdfCf1e48Fb8E7C66Fd7E0541BF9b1cf67558c49
Deploy contract:
npx hardhat run --network goerli scripts/deploySingleSwap.js
GitHub direct link for Remix:
import "github.com/Uniswap/v3-periphe...";

[@code.badger]

This channel is a hidden gem

[@BlockExplorerMedia]

Thanks my friend!

[@ouailtayarth4012]

I've been looking for this type of high-quality DeFi content for almost a month, and I just found it! Thank you for your efforts, and please keep up the good work

[@quantaraum]

i lovr the red string pullinh through your tutorial. you help us really understand the different sections and connecting each point on our own. Big props! much appreciated

[@dannithomx]

Thanks for this video, I was stuck up on this tiny thing that I just couldn't see it. It caused my swaps to keep reverting, thanks to you I was able to spot it and move past it. Great work, keep up the good work chief!!!

[@redbeet4772]

My swap also keep reverting, do you happen to know what I missed?

[@luiscallero6288]

Love it how you go step by step and give it a clear and simple explanation of the contract provided by Uniswap. Uniswap should attach this video to better explain the documentation. Uniswap documentation is very poor. So your review is awesome!! Thanks!!

[@BitcoinAndCryptoCurrency]

I have watched many videos on crypto and this is the first one I watched twice - loved it

[@codywatt7775]

Awesome work my friend. Thank you for putting in the time to make this for us. It has been super helpful!

[@user-ir9xc3gg4v]

Thanks bro . great video !

[@pratyushchauhan6944]

amazing contribution ser!!!

[@LoreBaculima]

Super helpful, thank you!!!

[@samadams4751]

Another great tutorial🙏

[@BlockExplorerMedia]

Thanks brother!

[@matinjiryaeisharahi4294]

I appreciate you , It was very useful

[@josephdelgiorgio3997]

Great video. I just applied to work at UniSwap, chances of getting hired are slim, but they have a great product and its awesome to see it work in realtime through the lens of these tutorials. Thank you!

[@BlockExplorerMedia]

Awesome! Glad you liked it and good luck : )

[@harris998]

​@@BlockExplorerMedia hello there, is there a way I can contact you regarding a Coding service question, maybe tw or email

[@BitcoinAndCryptoCurrency]

very good to learn the currency future

[@BitcoinAndCryptoCurrency]

informative and educational thanks

[@sahbibayari7133]

Thanks for sharing this diamonds infos ❤️

[@BitcoinAndCryptoCurrency]

very good and informative video

[@oreosworldxp9654]

Bro this channel is based asf. Good shit bro. You’re smart dev. Let me find out you launch Pepe

[@BitcoinAndCryptoCurrency]

easy to understand thanks

[@BitcoinAndCryptoCurrency]

pleased I chose this video to learn from

[@Abdulkadir-vb3vj]

Thanks for the great tutorial. Where can I get those test tokens? I mean LINK and USDC especially. I found no faucet for addresses you used.

[@basitkhan3853]

Good content

[@vinayakshukla2653]

thanksAloT very usefull

[@BitcoinAndCryptoCurrency]

my questions have been answered

[@user-tt7hl2fb6i]

Thank you for this video! It provides a great explanation! However I have one question. This example perfectly works on my edu project, but contract can`t take and return money directly to the "owner", metamask account. The swap works great before i try to connect it with the client metamask. I will be so grateful if you can help me to pair contract with metamask. Thanks in advance.

[@xheikhfazi5481]

Great Content learning lots of stuff....

[@thedemonlord300]

Hey could you tell me why we chose to write the functions of the IERC20 interface at the start of the contract instead of just importing the entire IERC20 contract like in the Flash Loan contract?

[@dtory]

Hey, can you explain the use of ask Incase we want to deployed it on other network and Testnet other than bsc and Eth/tesnet

[@xlogic5020]

That's a great educational video ! l have a question. For example we have a wallet and l have eth in it. l want to swap eth to "x" token with a transfer prosess with this system. If l send eths to this contract. Can this contract do this for me or should l do some different changes ? l am looking forward your respond.

[@roxanabraescu6180]

Hi, Thanks for your videos they are very educational..... Question ⁉️ I want a flashloan but I don't know how to code it or if it's possible... Example I want to buy eg, Eth from binance at lower price and then sell the Eth to eg, Kucoin for more. How can I specify in the code to buy from binance and sell on kucoin and then pay the flashloan??.

[@diiialee7012]

Do you prefer email? Or nah? Also is your patreon still accessible and you still use it.

[@kurdvevoofficial]

first thanks for you content tutu hope you make tut about erc20 token and full video and include all function such as : Tax Transferable Tradable Mintable Burnable Transfer Ownership Secure

[@paraipan-rq2sj]

very initeresting, but goerli is deprecated. how do i do to change to sepolia? im new to this . thank you .

[@user-tx6hc8el1r]

Have you made a video where u can unclog the smart contract ?

[@xheikhfazi5481]

Sir if you can help us that how we can get price of a pair on different exchanges like uniswap,sushiswap it will be a great favour...

[@user-hl6hv3qu9c]

where can i get copious amoutn of test tokens for usdc / weth ; unable to start with a 1000 each; any pointers will help even for polygon testnetwork

[@velafresh]

My token got split up into two routes 90% and 10% but I never received the 10% so basically I instantly lost $106 what exactly happen here do you think?

[@amalnathsathyan6029]

30:27 I think the Quoter contract can get the reserves and give the prices.

[@shankarmettur1551]

I will create token new contract but I can not swap to another contract how to posible than liqudity pool make

[@juanmosqueda2210]

I know this is kind an off topic but I'll take my shoot here too. Is possible to get the routerAddress by code? I am trying to replicate this in to the Fuji testnet but I can't find it in any documentation (Uniswap or Avalanche) so I'm wondering if it possible to code something that return that address but based in what I researched it looks like is simple not possible. Any help I will really appreciate it.

[@ashishjanghel9340]

I am facing issue on your flashloan tutorial while running on mainnet polygon....can you please help

[@stepchild5453]

So I just need to import the github link to remix? That's gona run the universal router?

[@ViralKiller]

is there a Python version of this?

[@ramonmarino9396]

Is it possible to do all this directly from etherscan?

[@Codewriter5482]

sir how to add faucet in goerli link token and usdc

[@konkard9503]

Can you code a front run bot?

[@improvingmuslim]

what if i want to do this on the polygon network?

[@baselkelziye4552]

hey man can you list some mid-advanced common projects that would improve my skills in sol, thanks for the great content btw

[@BlockExplorerMedia]

absolutely. i have been thinking about what level to target as I'm not quite sure if most of the viewers are beginner, intermediate or advanced. i think I need to do all of the above. anything in particular you'd like to see? I have some ideas for intermediate / common tutorials and maybe even do some more beginner ones. thanks!

[@baselkelziye4552]

@@BlockExplorerMedia im thinking of a multisig wallet as a practice for myself not sure if it will fit for the audience :D

[@BlockExplorerMedia]

No I think that would be a good one. Let me see what I can do.

[@milanis7a]

@@BlockExplorerMedia A tutorail for a makerdao clone would be dope!

[@deethekingstevens7146]

Another good tutorial on Dex, but how can I get commission for every swap?

[@BlockExplorerMedia]

Thank you! When you become a liquidity provider you would earn interest based on the fees paid by other users doing swaps.

[@razorjhon2622]

@@BlockExplorerMedia do you mean if i created a token whenever someone swap my token to another i will get fees ? can you explain please

[@douglasduarte360]

And how about Uniswap Swap Router address SEPOLIA ? I Can't find

[@nocareit]

Hi, this code work for pancakeswap?

[@feff232]

This is absolutely 10million dollar knowledge and all it gets is 57 comments. Hilarious. Thanks man

[@astrofoundation]

Hi block Explore.... Can you make a tut where we can get buy and sell transactions for a token just like poocoin does

[@TheGaneshshow]

hello sir, 3.08 seconds, why you will get 4 lp shares or 12 pool tokens? Thank you sir.

[@BlockExplorerMedia]

I don't think the numbers in this slide are technically 100% accurate - the main idea is to show that in v2 liquidity tokens are distributed to liquidity providers in proportion to their contribution. Also note that in v3 they don't use liquidity tokens at all - instead an ERC-721 is issued representing the provider's share of the pool.

[@TheGaneshshow]

@@BlockExplorerMedia Thank you sir very much! Sir, Please do a complete video on hardhat Testing.

[@BlockExplorerMedia]

I am planning to do a dedicated Hardhat video sometime soon.

[@astrofoundation]

When are you back ?

[@shq-cali6111]

hey man how r u . havent seen u active. i hope everything is okay

[@harrydare8191]

Why has he not been posting?

[@diiialee7012]

How can I reach you sir?

[@user-we6ri4gi9y]

Smart contrat in The video différent in your repo😂

[@TheGaneshshow]

Hello sir, poolFee = 3000, what is 3000 here? Thank you.

[@BlockExplorerMedia]

Expression of "0.3%" in Solidity since Solidity doesn't support floating point numbers. The conversion must take place in the Uniswap Pool contract.

[@TheGaneshshow]

@@BlockExplorerMedia Thank you sir. I got it. There will no floating numbers.

[@TheGaneshshow]

Hello Sir, 14.47 secs, pool fee is 0.3%, But of which amount, it is 0.3%? Thank you sir.

[@BlockExplorerMedia]

The middle-tier fee is 0.3% of the desired token swap price. More info here: docs.uniswap.org/protocol/concepts/V3-overview/fees

[@TheGaneshshow]

@@BlockExplorerMedia Thank you sir. My doubt is cleared.

[@BlockExplorerMedia]

Anytime!

[@TheGaneshshow]

@@BlockExplorerMedia Hello sir, I want to talk to you one on one, Please reply sir. Thank you.

[@BlockExplorerMedia]

hey 20s - it's difficult for me to provide any support outside of the channel due to other obligations but you can reach me at my personal email at 'jgspruance' at g mail and I will try my best to get to it. thanks!

[@-bolboi1676]

write a dex arbitrage trade bot

[@difference018]

I keep getting this error Source "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol" not found: File import callback not supported. I think it is a problem with the remappings. Any help would be appreciated

[@BlockExplorerMedia]

hi, what are you doing at the time when this error occurs and are you encountering it in Visual Code or in Remix. Please check that you are using the correct import for each environment - relative for VC and direct github url for Remix. You can find both in the video description.

[@difference018]

@@BlockExplorerMedia I solved the problem. In the remappings settings you should put "@uniswap/=node_modules/@uniswap/", "@openzeppelin/=node_modules/@openzeppelin/" Just thought others should know if they are having problems as well. Also set the optimizer to true in your hardhat config if you are getting the "stack too deep" error

[@BlockExplorerMedia]

Great - thanks for sharing.