Author: ETHGlobal
Compiled by: Felix, PANews
The ETHGlobal Buenos Aires hackathon concluded on November 23. This hackathon brought together top talents and experts from the Ethereum ecosystem, attracting numerous developer teams to explore new application scenarios for blockchain technology. The total prize pool for this event reached $500,000.
After evaluation, ten projects stood out among the 475 entries, covering 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 based on blockchain micropayments for controlling access to physical devices. This system was developed specifically for the Coinbase developer platform hackathon, demonstrating transactions without Gas fees, allowing users to pay for renting robots using QUSD stablecoin without needing to hold ETH for Gas fees.
The system implements a complete payment service architecture: users authorize QUSD payments in their wallets, and service providers submit transactions on-chain and pay Gas fees. This project enables IoT and robotic applications to truly achieve micropayments, which would otherwise be unfeasible 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 constructed using Next.js, Bun.js, and Solidity, and is deployed on the Celo blockchain.
- Real-time flight market: Predict real flights using real-time odds.
- Real-time pricing: An AMM-based pricing mechanism that automatically updates based on market demand.
- Decentralized resolution: Automatically verifies flight status through the Oasis backend oracle.
- Farcaster integration: Supports Farcaster Frame mini-programs.
- 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 through the x402 and ERC-8004 protocols, running real-time inference and actual trades. It showcases the complete on-chain collaboration loop 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 using x402 agents, where the sender can choose the token, and the receiver can seamlessly obtain stable assets.
Payload Exchange acts as a proxy 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 pay part or all of the amount 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 fees.
- Content providers: Lower access barriers. Monetize content without setting up paywalls.
- Users: Obtain premium content/tools for free or at a discount through transaction 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 a single price range, Yoga can manage multiple sub-positions (different price ranges) under a single ERC721 token, enabling complex liquidity allocation strategies across price ranges.
The contract provides a simple application binary interface (ABI) that allows LPs to easily specify the modifications they want to apply (liquidity increments), and the contract automatically calculates how to modify 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 upon capture and generates on-chain NFTs verified by zero-knowledge proofs, ensuring tamper-proof, authenticated memories.
LensMint is a complete hardware-to-blockchain camera system designed to guarantee the authenticity and ownership of real-world photos. The system is based on a Raspberry Pi camera and employs hardware-level encrypted identities, signing and hashing each photo upon capture, verifying authenticity through zero-knowledge proofs generated by vlayer, and conducting on-chain verification via RISC Zero. The system uploads all media to Filecoin for permanent decentralized storage and mints an ERC-1155 NFT representing the authenticated memory. The built-in QR code system allows individuals in the photos to instantly claim their NFTs, enabling proof of attendance, authenticated memories, and automatic revenue sharing.
LensMint provides a trustless way to prove the device source, timestamp, and integrity of photos, addressing authenticity, provenance, and monetization issues for creators, journalists, event organizers, and scientific literature.
This project was built by Mohit Bhat.
Halo
Halo is a mini-program based on World Chain that converts real shopping receipts into on-chain rewards for verified users. Users scan shopping receipts from any store, and Halo evaluates them through a lightweight processing flow, then distributes rewards to users verified by World ID. Throughout the process, the user's personal identity remains private.
Shopping receipts contain important information about real economic behavior, but this information is often lost or locked in closed systems. Halo captures this information, processing each receipt to extract details such as merchant, timestamp, total amount, currency, and category. Rewards can only be claimed by specific users, creating a privacy-protecting method that links offline behavior with on-chain rewards while preventing witch-hunt attacks.
This project was built by hellocrypto, @DNC_Labs.
zkx402 (ProofofLeak)
zkx402 is an extension of the x402 protocol that integrates zero-knowledge proofs for verifying variable payments and verifiable content.
Consumers (human or AI agents) have different pricing tiers, and users who can verify their identity using zero-knowledge credentials receive discounts. Producers can prove the source of their content through additional zero-knowledge proofs. For example, the identity of an author confirmed by a specific journalist, proof of human creation, or IoT data with GPS/sensor details.
Whistleblowers can receive rewards without revealing their identity. Journalists can obtain lower access costs by proving they are human or employed by 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-program that enables seamless asset transfers using Aqua AMM and LayerZero messaging.
Aqua is a shared liquidity layer developed by 1inch, designed to address inefficiencies present in current AMMs. These issues include: 1) 90% of AMM liquidity is never utilized, leading to liquidity stagnation. 2) This results in fragmented liquidity, as AMMs end up with idle and unused liquidity across different protocols and chains.
Aqua0 improves Aqua in a cross-chain manner. The current issue with Aqua is that it operates as a bookkeeping layer, usable on only one chain at a time. Aqua0 will create a cross-chain AMM market, leveraging Layer Zero's cross-chain components and Aqua's shared liquidity contracts, allowing LPs to unlock new revenue opportunities and enhance 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 sign Bitcoin transactions using native Schnorr signatures (Taproot/BIP340) to trigger EVM transactions (DeFi swaps, token transfers, contract calls).
The Cross-Chain Relay Engine (CRE) scans Bitcoin blocks and, upon detecting valid, Schnorr-authenticated BMCP messages embedded in OP_RETURN, executes secure off-chain (risk management, validation) and on-chain (contract calls) calls on chains like Polygon and Ethereum, seamlessly utilizing Chainlink CCIP. BMCP ensures that all processes remain trust-minimized, anchoring to Bitcoin's finality through cryptographic techniques, and can be composably used across different ecosystems.
This project was built by Vibhav Sharma, Vollantre, James Scaur, Manuel.
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