Code Flash Swaps & Arbitrage on Uniswap V3 Pools | Solidity & JavaScript | Borrow, Arbitrage & Repay

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Courses:
👉 Build a Uniswap V3 interface that can do swaps: bit.ly/3JkXYqL
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Do you know how to take a flash loan from a Uniswap V3 pool, use it to make swaps on other pools, and then pay back the loan in a single transaction?
That's what flash swaps in Uniswap V3 allow you to do. I'll walk you through code to implement this.
We are going to take a flash loan from one Uniswap pool, generate profits via arbitrage on two other pools, and then pay back the loan.
We'll do all this programmatically with JavaScript and Solidity.
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Code: gist.github.co...

[@blockmancodes]

Learn to use all of Uniswap's swap and liquidity functionality with code. bit.ly/3JkXYqL

[@LORDWASEEMMALIK]

I am interested in this, can you tell me will you be teaching this?

[@fitzroyw1]

At last i find a Developer who isnt a scammer. Good work sir.

[@user-ef9zk6np2e]

Is keeping some eth or other crypto, i am intended to arbitrage,in my wallet necessary to pay for gas fee using this code to execute successfully? Can the gas fee be deduced from the profit I gain through the loan?

[@jerrywang3225]

This is the best flashloan tutorial on youtube, period!

[@blockmancodes]

Thanks brother

[@davetube75]

Gorgeous tutorial! Code is simple to understand and so is the explanation!

[@blockmancodes]

Thanks brother!

[@metakulnft]

Did flash loan help you?

[@id104335409]

The real question is how do people find arbitrage opportunities. The spots are already taken by the people who most likely wrote the code originally or do this for a living. They know it well and they know how to use it. Lots of smart people out there are writing their own bots that will frontrun you on any deal. IF you get lucky to find any deal at all. The best cases I have seen is usually some obscure crazy swaps that are on the border of hacks or just plain robberies. That's where they punish the people who missed a flaw in their code and take millions out of their dapps.

[@davetube75]

This is an important question. Do these arbs actually exist, and if they do, do they get front run?

[@blockmancodes]

Honestly, it's harder and harder to make money on arbitrage. I just wanted to show the mechanics of it, but people I know making arb profits treat it like a full time job

[@davetube75]

@@blockmancodes do you have any or will you produce any videos on examining the mempool?

[@blockmancodes]

@@davetube75 Yes but I don't know when... my tutorial todo list is getting out of hand lol

[@KingYenny]

Whats the minimum, average & highest amount of gasFees needed for pairs on the uniswap V3 interface? From your experiences and observance?

[@himotara]

Great explanation! Quick question: Is it possible to create an arbitrage bot without relying on flash loans or any external funds, simply using my own ETH? And what's the ideal ETH threshold for profitability?

[@JV-gf3ee]

Yes, sample: const params = { tokenIn: immutables.token1, tokenOut: immutables.token0, fee: immutables.fee, recipient: acct2, deadline: Math.floor(Date.now() / 200) + (60 * 10), amountIn: amountIn, amountOutMinimum: 0, sqrtPriceLimitX96: 0, } const transaction = swapRouterContract.connect(account).exactInputSingle( params,

[@fawazshak]

Thank u! One of the best videos on flashloans

[@blockmancodes]

Thank you!

[@wanhonglau779]

This is absolutely great content Many KZbinr publish content on crypto algo trading but very few do in defi space! I have a question: why most defi bot is written in javascript instead of Python?

there are more js libraries you can reuse

[@blockmancodes]

Yea. You can use the same JS libraries used on the frontend of dapps, so developers already have experience with them

[@user-ef9zk6np2e]

Is keeping some eth or other crypto, i am intended to arbitrage,in my wallet necessary to pay for gas fee using your code? Can the gas fee be deduced from the profit I gain through the loan?

[@vaibhavkulkarni9926]

Do I need to paste my metamask address inside the code to get the profit from arbitrage?

[@JV-gf3ee]

Thanks. for all your videos. You have helped me so much.

[@viktorcortez5706]

Thanks for your video. Maybe you can make a video about DFS in crypto arbitrage?

[@austinewilliams7795]

Hello, Greetings from Nigeria, I have gone through most your videos in you channel (just subbed), and I think your channel is underrated, it has alot gems that could be very helpful for a beginner like me. That being said am a complete noob to programming. I mean a complete blank slate when it comes to coding, and I finding staring to be very overwhelming, pls I need your advise on where to start as a complete beginner. Pls your response will be highly appreciated.

[@blockmancodes]

Thank you! I'd start JS web development, then web3 on the frontend, and then solidity. But it's important to prioritize your interest as well, to help stay motivated

[@Jawzi]

Great tutorials, any chance you can do a tutorial on how some coins add fees to their transfers? Also how to encapsulate coins as NFTS?

[@harsh_pathak27]

is it still possible in 2024?

[@fitzroyw1]

Could you update the coding as i see that many are having problems installing.

[@xAA-pl4fd]

it would be interesting to understand how to use permit and permit2 with ethereum tokens with javascript and what are the differences

[@blockmancodes]

Hey. I've gotten a few questions about permit lately. Adding to my todo list

[@ABCDEFGH-or2eb]

Do you need to add liquidity to certain pools on Mainnet (like the 0% selected)? If so, how much liquidity?

[@blockmancodes]

What other Uniswap tutorials would you like to see?

[@bando8086]

Coming from a non coder...some ChatGPT tutorials would be cool! Maybe test around with some requests that can help to build a basic uniswap project in javascript/solidity!

[@user-ph8pd2lc8y]

Super nice video. What about : how to copy trade a specific wallet in pending transaction? Same value, same gasprice. Thanks a lot

[@DevMode951]

All of them!😮

[@SuperDividenz]

Great video thanks!

[@blockmancodes]

Glad you liked it!

[@ArthurXtm]

Im getting "Error: invalid bytecode" when deploying contracts. have any idea of what i could do?

[@buzzboo6442]

Can you help me? when running 06_flashSwap.js I got this Error: VM Exception while processing transaction: reverted with reason string 'TF'

[@cheesebeef890114]

Thanks for your great video? Do I need my own node for implementing this? and also will this work with other dexes like solidity type fork or uniV2？

[@blockmancodes]

You don't need your own node. And yes, it can be implemented for other DEXs

[@frontpage235]

Good day boss, nice content. I have a question. I followed the exact step you did in the video, at the end lf the flashloan i check the usdt address ln etherscan but I didn't see the $0.89 theres but in the code it showed the previous balance and the recent balance after the flsah loan. Secondly, i when i input my own wallet address it's still showing uour wallet address instead of mine.

[@MrLawalker]

Oh damn!

[@frankeke8541]

Now we need a tutorial on a screener to automatically find arbitrage opportunities

[@blockmancodes]

Working on a few scripts to find arbitrage now :)

[@R3nzoku]

Great Tutorial! Is it possible to take a flashloan of 1 token(usdc) swap it in the first pool and then in the second pool use the output from 1st pool swap to take out usdc at the end? this will imply that when using the function exactinputsingle the second time you will have to use the output from the first one.

[@blockmancodes]

As long as you pay back the original token, you can do anything with it, including swap on other protocols

[@abc_12333]

@@blockmancodes What if I want to use a Balancer or dYdX Flashloan (external Flashloans) and combine that loan with swaps or adding/removing liquidity on Uniswap V3?

[@fcum5]

Could you do a tutorial on kyberswap?

[@blockmancodes]

Yes. Maybe after I do AAVE

[@gobindapaul8506]

Great job 👍

[@blockmancodes]

Thank you!

[@villainonline]

Fantastic video. You’re very knowledgeable and passionate about your work, love to see it. How long have you been coding to be this good at it?

[@blockmancodes]

Thanks brother. Getting close to 10 years :)

[@metakulnft]

Did flash loan help you?

[@danis1840]

Great work thank you. Just to get ist: You are deploying these 3 pools, because they are not available on testnet. If you would do it on mainnet, you don't need to deploy pools and tokens, right?

[@blockmancodes]

Exactly. For most tokens, all the pools for the token will already exist on mainnet

[@ohhu6098]

this just confused me lol. so we don't need to deploy 3 pools? what do we need to do differently if we're on mainnet? thanku

[@viktorcortez5706]

Can I ask you a stupid question? Why don't you launch your file a simple way : node scripts/06_flashswap.js ?

[@leon-do]

you have a community like tg or slack?

[@_mil0__]

Great content thank you

[@blockmancodes]

My pleasure

[@demarcuswalker257]

What token and how much do I need for the flashloan to work for Uniswap V3 Flashloans and Arbitrage

[@blockmancodes]

You can do this with any tokens. Do you mean that the code is not working for you?

[@davetube75]

Serious question ... are you making consistent profits from arbitraging or is this just an "educational" thing.

[@blockmancodes]

Educational. Nowadays, you need to put in a huge amount of effort to find real arb opportunities

[@davetube75]

@@blockmancodes Ya I think you’d need to look at other networks and scan the mempool and have some sophisticated algos to get ahead of the competition. I’m still trying tho …

[@youssefloyd2060]

Hello brother I have a question. I’m interested to do some arbitrage. Did you suceed and if yes what are you advice me to do ? I did one formation in solidity and one in javaScript. I think now I need a formation in algorithm and Defi.

[@Barbershoppod]

Do you do consults?

[@AllJokesAsideBenKirby]

Is there a code you've written like this but for flash swaps on Bsc chain using Pancakeswap?

[@blockmancodes]

I have not, but I'll add to my todo list

[@ThePlankton5165]

I have a Chromebook, so I probably won’t be able to use Hardhat. Does that mean I cannot use this code?

[@blockmancodes]

I'm not familiar with chromebook. Does it run linux? It think you can make it work

[@ThePlankton5165]

@@blockmancodes I think it does, but for some strange reason, I’m not able to go to settings to be able to turn on Linux (which is off by default). I click the gear by the clock, nothing happens.

[@ThePlankton5165]

⁠@@blockmancodes I decided to try to compile PairFlash on Remix IDE after copying and pasting the gist link, and got seven errors. I already commented that this morning. I hate to be a bother, but I’m still waiting for a response from you. Are you there?

[@ThePlankton5165]

I figured I would just try to run the scripts on Remix IDE. I tried compiling PairFlash and was given seven errors.

[@ThePlankton5165]

Why aren’t you answering me? Are you going to answer me?

[@blockmancodes]

I don't use remix. Are you using exactly the same versions I used in the tutorial?

[@ThePlankton5165]

@@blockmancodes Yes. I ran again, and weirdly enough, only got one error: Error: not found @uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol You said to use 0.7.6, I used 0.7.6.

[@user-fk5fx2kl9e]

when i try to deploy it invalid byttcode error issue ,and i also check weth.json file ,json file is good then why

[@blockmancodes]

This is caused by changes in different versions on the npm packages. Can you confirm you're using the exact same versions as me?

[@user-fk5fx2kl9e]

@@blockmancodes some are same but some are updated

[@mikhailgolovach8115]

@@blockmancodes change "@uniswap/v3-periphery": "^1.0.1", to "@uniswap/v3-periphery": "1.0.1"

[@block_hacks]

Do you have Patreon or Discord community? I fucking love this

[@blockmancodes]

Good reminder to get one set up

[@atrox7685]

nice work

[@blockmancodes]

Thanks for watching!

[@tonkihonks3430]

Do you have the source code published on GitHub?

[@blockmancodes]

Just what's in the description

[@TDi.Traders]

Hey bro is it possible to paste it in remix ide?

[@blockmancodes]

I've only ever used Remix for simple code, so I can't say. But I suspect it would take a lot of effort

[@jboyce007]

Anyone successfully doing this with flashbots here?

[@user-km6ur8qm7b]

Psyop