Top 10 Projects from ETHGlobal Buenos Aires Hackathon: An In-Depth Look

Top 10 Projects from ETHGlobal Buenos Aires Hackathon: An In-Depth Look

The ETHGlobal Buenos Aires Hackathon concluded on November 23rd, bringing together top talent and experts in the Ethereum ecosystem. This event attracted numerous developer teams to explore new applications of blockchain technology, with a total prize pool of $500,000. After judging, ten outstanding projects were selected from the 475 participating projects, covering areas such as Non-Fungible Tokens (NFTs), Decentralized Finance (DeFi), and Prediction Markets. Here's a quick rundown of these ten projects:

Paybot

Paybot showcases the X402 Payment Required protocol for blockchain-based micropayments, used to control access to physical devices. Developed specifically for the Coinbase Developer Platform Hackathon, it demonstrates transactions without gas fees. Users can use QUSD stablecoin to pay for renting robots without needing to hold ETH to pay gas fees. This system achieves a complete payment service architecture: users sign QUSD payment authorization in their wallets, and service providers submit the transaction on-chain and pay the gas fees. This project enables IoT and robotics applications to truly realize micropayments, which would otherwise be cost-prohibitive 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.

• Instant Flight Markets: Use instant odds to predict real-world flights.
• Instant Pricing: AMM-based pricing mechanism that automatically updates prices based on market demand.
• Decentralized Resolution: Automatically verify flight statuses through the Oasis backend oracle.
• Farcaster Integration: Support for Farcaster Frame applets.
• Celo Blockchain: Fast, low-cost transactions on the Celo network.

This project was built by Faezeh, TheMonkeyCoder, and 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 x402 and ERC-8004 protocols, running real-time inference and real trades. It demonstrates 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, senders can choose tokens, and receivers seamlessly get stable assets. Payload Exchange is an agent layer that intercepts x402 payment requests and introduces a third party: a sponsor. This extends the end-user payment experience, where in addition to stablecoins or other currencies, users can choose other payment methods. Sponsors will pay part or all of the amount in exchange for user operations or data. This tripartite cooperation model benefits all participants:

• Sponsors: Acquire users, collect data, or guide specific behavior by paying for content access.
• Content Providers: Lower access barriers. Monetize content without needing to set up paywalls.
• Users: Get premium content/tools for free or at a discount by trading operations/data instead of money.

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

Yoga

The Yoga project implements a non-fungible (NF) position manager, allowing LPs to manage complex multi-range positions in 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 complex liquidity allocation strategies across price ranges. The contract provides a simple application binary interface (ABI), allowing LPs to easily specify the modifications they want to apply (liquidity increments), and the contract will automatically calculate how to modify the underlying UniV4 positions. This project was built by Charlie Mack, Duncan Townsend, Luigi, and Michael Fautch.

LensMint Web3 Camera

LensMint Web3 Camera is a hardware-based system that signs photos as they are taken, and produces zero-knowledge-proven on-chain NFTs, enabling 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 utilizes hardware-level cryptographic identity. Each photo is signed and hashed when taken, and its authenticity is verified through a zero-knowledge proof generated by vlayer, and verified 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 people in the photos to immediately claim their NFTs, enabling proof of attendance, authenticated memories, and automated revenue sharing. LensMint provides a trustless way to prove device origin, timestamp, and integrity of photos, thereby solving authenticity, provenance, and monetization issues for creators, journalists, event organizers, and scientific documentation. This project was built by Mohit Bhat.

Halo

Halo is a mini-app based on World Chain that turns real-world shopping receipts into on-chain rewards, rewarding verified users. Users scan shopping receipts from any store, and Halo evaluates them through a lightweight processing flow, then issues rewards to users verified through World ID. The user's personal identity always remains private throughout the process. Shopping receipts contain important information about real economic behavior, but this information is often lost or locked in closed systems. Halo captures this information, and each receipt is processed, extracting details such as 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 to on-chain rewards. This project was built by hellocrypto and @DNC_Labs.

zkx402 (ProofofLeak)

zkx402 is an extension of the x402 protocol, integrating zero-knowledge proofs for verifying variable payments and verifiable content. Consumers (humans or AI agents) have different pricing tiers, and users who can verify their identity using zero-knowledge credentials get discounts. Producers can prove the origin of their content by attaching zero-knowledge proofs. For example, author identity confirmed by a specific journalist, proof of synthetic creation, or IoT data with GPS/sensor details. Whistleblowers can get compensated without revealing their identity. Journalists can get lower access costs by proving they are human or employed at a reputable media organization. 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, and vaughn.

Aqua0

Aqua0 is a mini-app for seamless cross-chain asset transfer using Aqua AMM and LayerZero message passing for shared liquidity. Aqua is a shared liquidity layer developed by 1inch aimed at solving the inefficiencies that currently exist in AMM. These issues include: 1) 90% of AMM liquidity is never used, resulting in stagnant liquidity. 2) This causes liquidity fragmentation, where AMMs end up with idle and unutilized liquidity across different protocols and chains. Aqua0 improves Aqua in a cross-chain manner. The current problem with Aqua is that it acts as a book-keeping layer and can only be used on one chain at a time. Aqua0 will create a cross-chain AMM market, utilizing Layer Zero's cross-chain components and Aqua's shared liquidity contracts to enable LPs to unlock new earning opportunities, thereby increasing capital efficiency. This project was built by Yudhishthra Sugumaran, Andrei De Stefani, and @tomasmazzi.

BMCP

BMCP (Bitcoin Multi-Chain Protocol) connects Bitcoin and EVM chains through true cross-chain programmability. Users can use native Schnorr signatures (Taproot/BIP340) to sign Bitcoin transactions triggering EVM transactions (DeFi swaps, token transfers, contract calls). The Cross-Chain Relay Engine (CRE) scans Bitcoin blocks, and when it detects a valid, Schnorr-authenticated BMCP message embedded in OP_RETURN, it executes off-chain (risk management, verification) and on-chain (contract calls) secure calls on chains like Polygon, Ethereum seamlessly using Chainlink CCIP. BMCP ensures all processes remain trust-minimized, anchored to Bitcoin's cryptographic finality, and composable across different ecosystems. This project was built by Vibhav Sharma, Vollantre, James Scaur, and Manuel.