Quick overview of the ten winning projects from ETHGlobal Buenos Aires hackathon

2025.11.25

Quick overview of the ten winning projects from ETHGlobal Buenos Aires hackathon

covering areas such as NFTs, DeFi, and prediction markets.

2025.11.25 - 01:35:17

ETHGlobal

Navigating Web3 tides with focused insights

covering areas such as NFTs, DeFi, and prediction markets.

Text: ETHGlobal

Translation: Felix, PANews

The ETHGlobal Buenos Aires hackathon concluded on November 23. This event brought together top talent and experts from the Ethereum ecosystem, attracting numerous developer teams to explore new applications of blockchain technology. The total prize pool for this event reached $500,000.

After evaluation, ten projects stood out among the 475 submissions, covering areas such as NFTs, DeFi, and prediction markets. PANews brings you a quick overview of these 10 projects.

Paybot

Paybot demonstrates the X402 Payment Required protocol based on blockchain micropayments to control access to physical devices. Developed specifically for the Coinbase Developer Platform hackathon, it showcases gasless transactions, allowing users to pay for renting robots using the QUSD stablecoin without holding ETH for gas fees.

The system implements a complete payment service architecture: users sign QUSD payment authorizations in their wallets, while service providers submit transactions on-chain and cover the gas costs. This project enables true micropayments for IoT and robotics applications, which would otherwise be prohibitively expensive due to high gas fees.

This project was built by @sprpstsn.

JetLagged

JetLagged is a decentralized prediction market platform built on Celo and Oasis where users can predict flight delays and cancellations. The platform is built using Next.js, Bun.js, and Solidity, and deployed on the Celo blockchain.

Real-time flight markets: Predict real flights with live odds.
Real-time pricing: AMM-based pricing mechanism that automatically updates based on market demand.
Decentralized resolution: Automatically verifies flight status via an Oasis backend oracle.
Farcaster integration: Supports Farcaster Frame mini-apps.
Celo blockchain: Enables fast, low-cost transactions on the Celo network.

This project was built by Faezeh, TheMonkeyCoder, zkfriendly.eth.

Hubble Trading Arena

Hubble Trading Arena is a fully open-source autonomous trading environment where on-chain agents are hired, paid, and coordinated via the x402 and ERC-8004 protocols, running real-time inference and live trading. It demonstrates the complete on-chain collaboration cycle required for thousands of professional financial agents to work together without human intervention.

This project was built by Amy@MeetHubble.

Payload Exchange

Payload Exchange allows merchants to accept any form of payment via x402 agents, letting senders choose their preferred token while recipients seamlessly receive stable assets.

Payload Exchange acts as an agent layer that intercepts x402 payment requests and introduces a third party: sponsors. This enhances the end-user payment experience—beyond stablecoins or other currencies, users can opt for alternative payment methods. Sponsors pay part or all of the cost in exchange for user actions or data.

The three-party model benefits all participants:

Sponsors: Acquire users, collect data, or drive specific behaviors by paying content access fees.
Content providers: Lower access barriers. Monetize content without setting up paywalls.
Users: Access premium content/tools for free or at a discount by exchanging actions/data instead of money.

This project was built by qap, luis, Marcelo, Soko.

Yoga

The Yoga project implements a non-fungible (NF) position manager that allows LPs to manage complex multi-range positions within a single NFT. Unlike traditional position managers where each NFT represents only one price range, Yoga can manage multiple sub-positions (different price ranges) under a single ERC721 token, enabling sophisticated liquidity allocation strategies across price ranges.

The contract provides a simple application binary interface (ABI), allowing LPs to easily specify modifications they want to apply (liquidity increments), with the contract automatically calculating how to adjust the underlying UniV4 positions.

This project was built by Charlie Mack, Duncan Townsend, Luigi, Michael Fautch.

LensMint Web3 Camera

LensMint Web3 Camera is a hardware-based system that signs photos at capture and generates on-chain NFTs verified via zero-knowledge proofs, creating tamper-proof, authenticated memories.

LensMint is a full hardware-to-blockchain camera system designed to ensure authenticity and ownership of real-world photographs. Built on a Raspberry Pi camera with hardware-level cryptographic identity, every photo is signed and hashed at capture, verified for authenticity via zero-knowledge proofs generated by vlayer, and validated on-chain through RISC Zero. All media is uploaded to Filecoin for permanent decentralized storage, and an ERC-1155 NFT representing the authenticated memory is minted. An integrated QR code system allows individuals in the photo to instantly claim their NFT, enabling proof-of-attendance, authenticated memories, and automatic revenue sharing.

LensMint offers a trustless way to prove device provenance, timestamp, and integrity of photos, addressing authenticity, provenance, and monetization challenges for creators, journalists, event organizers, and scientific documentation.

This project was built by Mohit Bhat.

Halo

Halo is a mini-app built on World Chain that transforms real-world shopping receipts into on-chain rewards for verified users. Users scan receipts from any store, and Halo evaluates them through a lightweight processing pipeline before distributing rewards to users verified via World ID. Throughout the process, personal identities remain private.

Receipts contain valuable information about real economic activity, but this data is often lost or locked within closed systems. Halo captures this data—each receipt is processed to extract details such as merchant, timestamp, total amount, currency, and category. Rewards can only be claimed by specific users, creating a Sybil-resistant, privacy-preserving method to link offline behavior with on-chain incentives.

This project was built by hellocrypto, @DNC_Labs.

zkx402 (ProofofLeak)

zkx402 is an extension of the x402 protocol integrating zero-knowledge proofs to verify variable payments and verifiable content.

Consumers (humans or AI agents) have different pricing tiers, with discounts available to users who can verify identity via zero-knowledge credentials. Producers can attach zero-knowledge proofs to authenticate content origin—for example, authorship confirmed by a specific journalist, proof of human creation, or IoT data with GPS/sensor details.

Whistleblowers can receive compensation without revealing their identity. Journalists can gain lower access costs by proving they are human or affiliated with reputable media organizations. AI agents controlled by journalists autonomously pay via x402 on Base to access private sensitive data.

This project was built by Guilherme, Lam, Ra's Al Ghul, Mark Ballew, vaughn.

Aqua0

Aqua0 is a cross-chain shared liquidity mini-app that leverages the Aqua AMM and LayerZero messaging to enable seamless asset transfers.

Aqua, developed by 1inch, is a shared liquidity layer designed to address inefficiencies in current AMMs, including: 1) 90% of AMM liquidity is never used, leading to stagnant pools; 2) liquidity fragmentation, as AMMs end up with idle, unused liquidity across different protocols and chains.

Aqua0 improves upon Aqua in a cross-chain manner. A current limitation of Aqua is that as an accounting layer, it can only operate on one chain at a time. Aqua0 creates a cross-chain AMM marketplace, combining LayerZero's cross-chain components with Aqua’s shared liquidity contracts, enabling LPs to unlock new yield opportunities and improve capital efficiency.

This project was built by Yudhishthra Sugumaran, Andrei De Stefani, @tomasmazzi.

BMCP

BMCP (Bitcoin Multi-Chain Protocol) connects Bitcoin and EVM chains through true cross-chain programmability. Users can trigger EVM transactions (DeFi swaps, token transfers, contract calls) by signing Bitcoin transactions using native Schnorr signatures (Taproot/BIP340).

The Cross-chain Relay Engine (CRE) scans Bitcoin blocks and, upon detecting valid Schnorr-authenticated BMCP messages embedded in OP_RETURN, executes off-chain (risk management, validation) and on-chain (contract calls) secure operations on chains like Polygon and Ethereum, seamlessly leveraging Chainlink CCIP. BMCP ensures all processes remain minimally trusted, cryptographically anchored to Bitcoin's finality, and composable across different ecosystems.