Written by: ETHGlobal
Compiled by: Felix, PANews
The ETHGlobal Buenos Aires hackathon concluded on November 23rd. This event brought together top talent and experts from the Ethereum ecosystem, attracting numerous developer teams to explore new application scenarios for blockchain technology. The total prize pool for this hackathon reached $500,000.
After careful evaluation, ten projects stood out from 475 submissions, spanning areas such as NFTs, DeFi, and prediction markets. PANews provides a quick overview of these 10 projects.
Paybot
Paybot showcased the X402 Payment Required protocol for blockchain-based micropayments, designed to control access to physical devices. Developed specifically for the Coinbase Developer Platform hackathon, the system enables gasless transactions, allowing users to pay for robot rentals using the QUSD stablecoin without needing to hold ETH for gas fees.
The system implements a complete payment service architecture: users sign QUSD payment authorizations in their wallets, and service providers submit transactions to the blockchain while covering the gas costs. This project enables true micropayments for IoT and robotics applications, which would otherwise be impractical 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 was developed using Next.js, Bun.js, and Solidity, and is deployed on the Celo blockchain.
Real-time Flight Markets: Predict real flights with live odds.
Dynamic Pricing: AMM-based pricing mechanism that updates automatically based on market demand.
Decentralized Resolution: Automated flight status verification via Oasis backend oracles.
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, executing real-time inference and live trades. 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 enables merchants to accept any form of payment using x402 agents, where senders can choose their tokens and receivers seamlessly receive stable assets.
Payload Exchange is an agent layer that intercepts x402 payment requests and introduces a third party: sponsors. This expands the payment experience for end-users, allowing them to choose payment methods beyond stablecoins or other currencies. Sponsors cover part or all of the payment in exchange for user actions or data.
The three-party collaboration model benefits all participants:
Sponsors: Acquire users, collect data, or guide specific behaviors by paying for content access.
Content Providers: Lower access barriers. Monetize content without setting up paywalls.
Users: Access premium content/tools for free or at a discount by trading 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 specify the modifications they want to apply (liquidity increments), and the contract automatically calculates 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 the moment of capture and generates zero-knowledge proven on-chain NFTs, creating tamper-proof, authenticated memories.
LensMint is a complete hardware-to-blockchain camera system designed to guarantee the authenticity and ownership of real-world photographs. Built on a Raspberry Pi camera with hardware-level cryptographic identity, each photo is signed, hashed at capture, verified for authenticity via zero-knowledge proofs generated by vlayer, and validated on-chain through RISC Zero. The system uploads all media to Filecoin for permanent decentralized storage and mints an ERC-1155 NFT representing the authenticated memory. A built-in QR code system allows subjects in photos to instantly claim their NFTs, enabling proof of attendance, authenticated memories, and automatic revenue sharing.
LensMint provides a trustless way to prove a photo's device origin, timestamp, and integrity, 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 on World Chain that transforms real shopping receipts into on-chain rewards for verified users. Users scan receipts from any store, Halo evaluates them through a lightweight process, and then distributes rewards to users verified via World ID. Throughout the process, users' personal identities remain private.
Shopping receipts contain valuable information about real economic activity, but this data is often lost or locked in closed systems. Halo captures this information, processing each receipt to extract details like merchant, timestamp, total amount, currency, and category. Rewards can only be claimed by specific users, creating a sybil-resistant, privacy-preserving way to link offline behavior with on-chain rewards.
This project was built by hellocrypto, @DNC_Labs.
zkx402 (ProofofLeak)
zkx402 is an extension of the x402 protocol that integrates zero-knowledge proofs for verifiable variable payments and content authentication.
Consumers (human or AI agents) have different pricing tiers, with discounts available to users who can verify their identity using zero-knowledge credentials. Producers can prove the origin of their content by attaching zero-knowledge proofs. Examples include verified authorship by specific journalists, proof of human creation, or IoT data with GPS/sensor details.
Whistleblowers can receive payments without revealing their identity. Journalists can access content at lower costs by proving they're human or employed by reputable media organizations. Journalist-controlled AI agents 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 Aqua AMM and LayerZero messaging for seamless asset transfers.
Aqua is a shared liquidity layer developed by 1inch to address inefficiencies in current AMMs. These issues include: 1) 90% of AMM liquidity never being used, leading to stagnant liquidity. 2) This results in fragmented liquidity, as AMMs end up with idle, unused liquidity across different protocols and chains with different LPs.
Aqua0 improves Aqua in a cross-chain manner. The current limitation of Aqua is that it operates as an accounting layer usable on only one chain at a time. Aqua0 will create a cross-chain AMM marketplace using Layer Zero's cross-chain components and 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 with 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 secure calls—both off-chain (risk management, validation) and on-chain (contract calls)—on chains like Polygon and Ethereum, seamlessly utilizing Chainlink CCIP. BMCP ensures all processes remain trust-minimized, cryptographically anchored to Bitcoin's finality, and composable across different ecosystems.
This project was built by Vibhav Sharma, Vollantre, James Scaur, Manuel.