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Giving your LLMs their own crypto wallets I Bruno Skvorc and Akshat Gada

ETHGlobalTue, Dec 9, 2025, 12:00 AM

Join Bruno Skvorc and Akshat Gada for a workshop titled "Giving your LLMs their own crypto wallets", featured at ETHGlobal Buenos Aires 2025! _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇦🇷 *ETHGlobal Buenos Aires* This workshop is specifically for ETHGlobal Buenos Aires, a 3-day hackathon held November 21-23 at the Centro de Convenciones Buenos Aires, bringing together the most skilled web3 developers, designers and product builders from all around the globe for a weekend-long adventure to advance the Ethereum ecosystem! Watch the full ETHGlobal New Delhi 2025 playlist here: https://www.youtube.com/playlist?list=PLXzKMXK2aHh76O7FfAHPJkZcqTIfYpoyf _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ *Follow ETHGlobal* X: https://x.com/ETHGlobal​ Warpcast: https://warpcast.com/ethglobal Website: https://ethglobal.com YouTube: https://www.youtube.com/c/ETHGlobal _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Are you interested in Ethereum development and entrepreneurship?_ 👉 Sign up for the next ETHGlobal event: https://ethglobal.com/events 🎁 Get exclusive access and perks with ETHGlobal Plus! https://ethglobal.com/plus 📣 Want us to throw an event in your city? Tell us where! https://ethglobal.com/city

Transcript

Hey guys. Uh so this is the workshop for Polygon. Um and today I'll be going over what we expecting and the tracks for what Polygon um the tracks here. So this time [clears throat] around the tracks are completely focused on X42 which is an HTTP based payment protocol. uh we are focusing on this track because we see a lot of traction towards it and we think there's a lot of use cases that can be built on X42 specifically for this time if you uh so if you scan the QRS this is the ClickUp that you're going to see and if you go to this polygon price section you can see what we're expecting there are three things that we expect uh one is so basically two things that we expect one is an application focused build of X42 basically it means that you use X42 to protocol an agentic and a non-agentic application.

I'll give some examples as we move on. But we want an application that uses x42. That's one of the thing that we expect if you're building on polygon. Or else the next thing that we can do is uh extend x42. x42 is uh missing many features.

Batching, privacy, reputation, identity are some of the features that I've given out as an example. what you can go out and do is basically build out these features and uh show us how you implemented these features and this will also be useful for extending the spec and uh raising PR to the actual X42 protocol and like contributing it uh to the protocol in meaningful way. So that's what we planning to do this time around. The best resource and docs you have to build on top of Polygon is the agentic payments docs on polygon. This is the docs right here.

It's uh agentic docs.polygon.technology. It's also there on this click up here. So if you go and press explore x42, you can basically get to this docs.

This docs is a one-stop place for you to get all the resources on polygon. Um you can go to the x42 section here. Here is x42 introduction. These are all the facilitators that support polygon network. So if you're integrating an app on top of X41 polygon, you can use these facilitators.

Uh the recommendation would be to use these two facilitators. If you're planning to build on mainet, you can use the mainet one. If you're doing the test net, you can use the test net URL and build on top of it. And then um there are guides how X42 works, how basically the protocol works, what X42 is, the payment protocol, etc., etc.

And if you have read through X42, there are basically two components. There's the buyer and the seller. And there's a quick start guide that we have for basically allowing you to spin up the buyer and the seller on top of X42. That's also in this docs over here. So everything you need to access is over here.

Exactly. Uh there's this quick start repo as well. Uh you can take a look at this this repo repository where you can directly clone it, fork it and spin up X4 on Polygon. Um that's another way to basically get started on your hackathon. Oh, we are getting a little disturbance.

Okay.

Uh uh question to the audience here. How many of the people know about X42 before coming here? Like uh does is everyone aware of X42 and what we're building? Okay, that's great. That's great.

Yeah. So, you're caught up. Uh for people who don't know about X42, you can read it up on our docs as well. Yes. Uh so these are the docs that we are using and these are some of the tools.

So I think I've gone over all the docs/ resources you guys can use to get started on X4 on Polygon. The next step is looking at some examples. We have few examples here. Uh one of the example here is X42 autopay. So you can see the video over here of what it does.

It's basically a Chrome extension which allows you to pay for X42 endpoints directly through Chrome. This is one of the examples. This might be inspiration/ reference for you to build on top of X42. There's also another tool which can be very useful is the X42 CLI. So if you want to test any uh API call on X42, you can basically use the CLI and test these API calls.

That's also one of the tools that we have. I'm just guiding you through the docs because we have a very less time over here like 15 minutes and we have to take questions as well. So I'm going over the docs basically letting you know what exactly everything is. For detailed discussions, you can come over to the booth, validate your idea, tell us what you're building, how you're building it, and we can guide you through what can be a winning track on polygon. So that's the idea here.

Um, yeah, this is done. Uh, there's also one tool that I want to go into a little detail and discuss more is the LM wallet MCP server. So basically what this is, I can also show a demo here of the LM wallet MCP server. So basically this is cursor. uh you guys might be used to it and uh work with cursor ID.

I'll create a new chat here. Uh the LM wallet MCP server basically allows your LM to have its own wallet and do X42 calls through it. So in the cursor chat if I write create a new wallet uh it'll basically go and run this tool call wallet create and it'll label it as main wallet and this will basically give us the wallet address. It'll have a label and the network is polygon. It's also a HD wallet, a hierarchal detistic wallet and it will give us this pneumonic phrase through which we can generate new addresses as well.

Um, this wallet can also be used to pay X4O to endpoints. Now, I'll go through the MCP server tools over here to specifically show you what are all the tools that exist so that you can get a much greater idea. If you go tools and MCP section, you can see that the LM wallet is enabled right there. And you can go through the tools. You can see that there's a wallet create tool.

You can see that the wallet import tool. You basically have your own wallet. You can import it through your private key. That's also possible. And then there are all these wallet tools and there is these specific X42 tools.

So basically if you want to pay for an API you can pay for it through X42 as well. Um I can show you the detailed thing over here.

Yes. So what this MCP server allows you to do is create and manage wallets. You can check balances as well. You can make microp payments. You can also enforce limits.

For example, these agents hallucinate sometimes. So you can enforce limits to basically uh gatekeep them for spending above a certain amount and also you can basically ask them to pay for any API. So I'm just giving you examples of what can be built. Uh I also have a few great examples from Twitter. This is a developer from Coinbase which basically built X4 to Monopoly.

Uh what X4 to Monopoly does is it fits different AIs like Claude Chad GBT in a game of Monopoly. And since Monopoly has payments inside that, it uses X42 as a payment railway uh rails. Uh and basically the transactions happen through X42. And this is how the game is structured. And this is like an example reference for you guys to see what is cool and what can be built.

There's also another thing. This is basically the extension part. The first part was an application. This is an extension of X42. Uh what uh this particular person did is basically do paper token AI inference with X42.

What they did is that uh for AI inference if you know open router you can do AI inference. So for AI inference you can pay through X42 in USDC instead of paying through credits. That's what they did. So these are few examples that have gone through. Um we also have this specific coin price API which is particularly built on polygon.

So basically this API allows you to fetch any historical data about one particular token price. Uh this is also there in the tools and on our docs as well for you to build and use. Um another uh thing that I want to like just highlight if you're building in the agent space uh for X42 is there's something called agent zero SDK. um I'll uh hint to it after the talk but uh I'm not able to find the particular one here. I'll definitely link to it in our docs.

So agent zero SDK is basically an SDK which is connected to A4 contracts and which will allow us to oh sorry uh agent zero SDK is basically an SDK that you can make your agents with and also uh has anyone heard of A4 contracts over here? AW4 trustless agents uh contracts. No. Oh, that's great. So, AW4 is also this specific uh uh set of contracts which allows you to add identity and reputation for your agents.

It has three contracts that are already deployed on Polygon Amoy that will basically allow you to add identity, [laughter] reputation, etc. to your agents so that they're trustless. Um in our docs, there's a section called ERCA4 on Polygon. you can see what is ERCA4 and these three registries on top of polygon ammoy and how to use it. So yeah uh this is basically uh the complete um uh resources/guide/d docs for building on top of polygon.

I can take some questions and uh if someone has like questions on they're not getting what exactly to build and if you want to have detailed discussion you can meet me outside on the polygon booth and like we can uh talk about idea and then we can uh guide you through it. Yeah.

10 minutes. Okay. We can take questions guys like you can ask like I've gone through all the resources over here. You can ask me any kind of questions or um anything like that. Yeah.

Yeah. Identity.

Uh it's basically a registry for identity for your agents. So you sign up your agent with that particular registry.

Yes. Yes. Uh it's you can use agent zero to do that as well or can you use a regular agent and then use agent identity registry as well?

Uh for that you need to specifically read about A4 contracts. Uh I'm not sure that uh reputation is active yet, but there's identity registry that's active.

Yeah.

Yes. Uh for the facilitator.

Yes. Yes. It is open source. Yeah. Yeah.

Uh it's the x42. RS repository. So I I can go through that as well. So this is the code for our facilitator. It's an open-source um Rust based facilitator.

Yeah.

We don't need to use it.

Yeah. Yeah. Yeah. You don't need to need to get into the code of the facilitator. You can basically go to this docs, go to the x42 section, the introduction section.

You have this link over here which is the test net facilitator or the mainet facilitator link for any kind of application you're developing. You don't need to spin up your own facilitator. You can basically use the one that we already have and integrate it in your application. Yeah. Um like um can we go around and like uh see what people are building like can you tell me any ideas that you guys have like we can discuss things here like can we start there uh with you guys like are you planning to build something on X42 Great guys.

So I'll I'll be at the booth all time. So if any detailed discussions are needed, if anything you want to ask, you can come right there and ask me about it. Um anything related to X42, we're always there. Yeah. So thanks a lot.

Thank you.

Automatic transcript — names and jargon may be misspelled.