Introduction to Uniswap v4 I Angela Ocando

Hi, if you're looking to build on top of VI over the weekend, today I'm going to show you unis swap before along with hooks. Basically, some sort of like scripts that you can add to the life cycle logic. Meaning that before and after the swap, you can add your custom logic. And that way you can build tons of no novel applications for the space out there along of course with like some resources, possibilities and tricks for you to get ready before ETH global wenosirus. Um during this hackathon we have $20,000 in prices and two main tracks focusing of course in this hooks that I just mentioned.

But before diving in, please let me introduce you the UNISA Foundation in Brazil of a more open and fair financial system. The UNISAW Foundation supports the growth, decentralization and sustainability of the UNISWAP community. Um, we are focusing on five key pillars, protocol and innovation, developers, governance, research and security. And through our grants, we're supporting our community for sure. So now we can dive in into the UNISAP B4 protocol or the version uh port of the protocol.

Um, but first let's introduce what it's unisop as a whole. At some point, if you've been here for a while, maybe you interacted with unis swap interface built by unis swap plus. It allows you to trade or swap tokens, meaning e forc for die, you name it. There's plenty of possibilities, but as a core, unis swap is a set of smart contracts that allows you to um exchange cryptocurrencies or ERC20 tokens. basically allows you to build this liquidity pool concept, a set of smart contract that from one side connects liquidity providers and on the other the traders.

So that way anyone out there can swap tokens in a decentralized way. Uh as I mentioned um we have uh four versions of the protocol at the moment but the first version of the protocol it was launched back in 2018. Um and then back in 2020 the B2 uh was launched with like the possibility for you to trade any ERC20 uh to ERC20 token and like a fee tier fixed from uh zero uh.3% and like a price curve with a constant product curve meaning like all of the liquidity was spread out around the curve and that way the liquidity wasn't that efficiency as it could. then in V3 version back in 2021.

This inherit all of the V4 uh V2 and V1 versions allows you to um trade ERC22 tokens. But now you have this price curve um concentrated liquidity. Now all of the liquidity as you as a liquidity provider, you can set the range where you're going to allocate it. And of course that allows you to have more liquidity efficiency, price execution and you name it along with like more fee tiers not just uh 0.0% but now you have other um options.

But earlier this year, we introduced uh Uniswap B4, a decentralized automated market maker with this concentrated liquidity uh feature, but also these five new ones such as the single door architecture that it's basically one contract meaning all of the pools, all the tokens, all the transactions happens in one contract. And of course this is super positive for gas efficiency matters along with like some continuous VX spectrum or dynamic speeds meaning no more fixed uh fears rather you choose the rules and you play and you understand how to how do you want to interact with your users or your LPS you name it. um also ERC6 uh 909 or flash account and that it's basically these features that allows you to have a more trading uh real trading experience in a decentralized way from internal token uh currency transfers uh to arbitrary and operations with many minimal token uh transfers of course super positive for gas efficiency um and then hoops what I mentioned at the beginning of this talk which is basically this arbitrary logic attached to the life cycle operations meaning before and after the swap you can decide the rules. Um but let's uh dive in a little bit into like what I just uh mentioned in practice. Um back in the day in B3 if you wanted to swap let's say ETH for D you had to go first in the life cycle operation from ETH to USDC then USC to die or on the other hand ETH uh to USDT or USCT to die now and before everything happens along in one contract one transaction.

So that's super positive for the ecosystem. And of course here you can see it in practice. Um but now if you go back to hooks uh as I mentioned these are just external contracts that modify the pool behavior. Meaning um that before and after the swap as you can see in this swap hook flow um the system is going to check the before swap black and then if you add any some sort of like custom logic that I'm going to mention about these functions available it's going to return that and then execute it. But then after the swap, it's going to check this uh flag.

Check after a swap flag. And if you add any some sort of like custom logic, it's going to return it. If not, just going to end the swap. As I mentioned, these are like 14 hook functions. Um, and I'm just going to show you some of them here.

Before, initialize, after initialize, add liquidity, remove liquidity, swap, um, donate, and you name it. Uh, you just got to turn it on and off. Important note in here just uh only one uh hook can be add per pool but then one hook serve many pools meaning that it's composable if at some point you create something super valuable the ecosystem anyone out there can also use it and leverage it of course doing always uh your own research and check uh the security purposes. Um, so I I showed to you like uh this um template. It's basically all of the functions that we have and you can turn on and off.

This is basically part of our V4 template. We developed this for you to create your first uh hook with all of the steps and instructions for you to build it. But we also have in this space the open Zeppelin uh host library, meaning they have these base hosts that you can leverage. And now jumping into uh the prices. I'm going to show you these resources in like a little bit.

Um for this uh hackathon we're focusing in like two main um prices or tracks. One is like the unisoft B4 stable asset hooks $10,000 in prices. Important to clarify you can either to create your cost hook or you can also leverage the OZ library. We are looking for logic and the best way to implement it. Um so yeah projects here uh here should explore novel applications of hooks for synthetic lending creditbacked trading or optimized uh stable AMM logic no interface required but of course we are going to audit the code and then on the other hand as per the second track we have unis swap v4 vol hooks $10,000 in prices and here projects should explore innovative hood logic that can help liquidity resilience mitigate loss versus rebalancing or LVR or improve capital efficiency for these uh volatile pairs.

Again, not interface required, but we're going to audit the code. So, now that you understand from a broader perspective what is like unisoft as a protocol, some of the features that we have in the UNISOP V4 protocol along with this hooks concept and how to use them uh these tools that we have uh for um you know like hack over these uh two tracks. I'm going to show you two like some resources for you to get ready. Um, so the first one and the most important in my opinion is this UF hacker toolkit that is going to include all of the resources that I'm just going to mention this presentation and even uh more tools and tricks for you to hack. Um, you can score uh scan this QR code and all of these QR codes are the same.

So it's going to take you out to the hacker toolkit where you're also going to find this unis swap docs for sure. Um but also uh like to recommend you like this how to build a custom hook video from the open sabling team. It's like super short. You can check it before the hackathon or doing it. Um and yeah, that way you can like get ready and prep.

Um if you have more time before after the hackathon you can also check um unisop course by separ. Um but some of my mo uh most stronger uh recommendation is like for you to check the unis swap hook incubator hook directory which basically unisap hook incubator is our uh incubator for uh developers to understand how to uh create hooks from uh the whole perspective and then cheat them. Um so there's plenty of possibilities, plenty of ideas, plenty of projects that maybe you can get some um inspiration and of course after the hackathon you might be able to join uh the incubator and yeah as I mentioned before the UNISB for template that is basically um like a template that you can use not just to create your first custom hook but it is going to allow you to run your own scripts and tests so that way make sure that your project is working uh properly along with the Oz hooks library that I also mentioned um previous which is basically a set of like base hooks that you can leverage again we're looking for the best logic implementation around stable and volatile per uh pairs so yeah um we're also having this unis swap workshop uh on Friday 5:30m local time and the workshop room 4 where we are going to dive in and guide you throughout this B4 template how to use it or even how to explore and interact with this OC um hooks library along with of course answering all of the questions you might have. My name is Angela Kandle. I am the developer community manager here in the UNISA Foundation and you can find me either in Telegram or X as at Okando Crypto.

But yeah, TLDDR my goal is to support you and help you throughout uh this builder journey and process. So we'll be available 247 in our Hooyo Telegram group. You can scan this QR code and of course IRL with our whole team in the UNISA foundation booth during it global wosar. So yeah, stoked to have you and see you soon. Bye bye.

Thank you.