Originally published by ETHGlobal. Compiled by Felix, PANews.

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Pioneering the Future: Top Innovations from ETHGlobal Buenos Aires

The ETHGlobal Buenos Aires hackathon, which concluded on November 23rd, served as a vibrant hub for the brightest minds and leading experts within the Ethereum ecosystem. Attracting numerous developer teams, the event fostered an environment of intense innovation, challenging participants to explore novel applications of blockchain technology. With a substantial prize pool of $500,000, the stakes were high, and the quality of submissions truly exceptional.

Out of an impressive 475 participating projects, 10 stood out to the judges, demonstrating significant advancements across diverse domains including NFTs, DeFi, prediction markets, and more. PANews is delighted to offer an exclusive glimpse into these cutting-edge projects that are set to shape the future of Web3.

Paybot: Revolutionizing Micro-payments for the IoT Era

Paybot introduces an innovative X402 Payment Required protocol designed for blockchain-based micro-payments, specifically enabling access control for physical devices. Developed initially for the Coinbase Developer Platform hackathon, this system showcases gas-free transactions, allowing users to pay for services, such as renting a robot, using QUSD stablecoin without needing to hold ETH for gas fees.

This robust payment service architecture enables users to authorize QUSD payments directly from their wallets. The service provider then submits the transaction on-chain, covering the gas costs. Paybot addresses a critical challenge for IoT and robotics applications, where high gas fees would otherwise render micro-payments impractical, paving the way for truly scalable, real-world blockchain utility.

Built by @sprpstsn.

JetLagged: Decentralized Flight Prediction Market

JetLagged is a decentralized prediction market platform built on Celo and Oasis, empowering users to speculate on flight delays and cancellations. Constructed with Next.js, Bun.js, and Solidity, and deployed on the Celo blockchain, JetLagged offers a seamless and engaging experience.

• Real-Time Flight Markets: Predict outcomes for actual flights with dynamic, real-time odds.
• Live Pricing: An Automated Market Maker (AMM) based pricing mechanism that updates automatically in response to market demand.
• Decentralized Resolution: Flight statuses are automatically verified through an Oasis-powered backend oracle, ensuring transparent and tamper-proof outcomes.
• Farcaster Integration: Supports Farcaster Frame mini-applications, enhancing user interaction.
• Celo Blockchain: Leverages the Celo network for fast and low-cost transactions, optimizing user experience.

Built by Faezeh, TheMonkeyCoder, zkfriendly.eth.

Hubble Trading Arena: Autonomous On-Chain Trading Ecosystem

The Hubble Trading Arena stands as a fully open-source, autonomous trading environment where on-chain agents are hired, paid, and coordinated via the x402 and ERC-8004 protocols. These agents execute real-time inference and live trades, demonstrating a complete on-chain collaboration loop necessary for thousands of specialized financial agents to operate synergistically without human intervention. This project represents a significant leap towards truly decentralized and autonomous financial operations.

Built by Amy@MeetHubble.

Payload Exchange: Flexible Payments & Sponsored Content via x402

Payload Exchange innovates payment flexibility by allowing merchants to accept any form of payment through x402 agents, while senders can choose their preferred token and recipients seamlessly receive stable assets. This platform acts as a proxy layer, intercepting x402 payment requests and introducing a third party: the sponsor. This model significantly expands the end-user payment experience, offering alternatives beyond stablecoins or traditional currencies.

Sponsors can cover part or all of the payment in exchange for user actions or data, creating a mutually beneficial three-party collaboration:

• Sponsors: Gain users, collect data, or incentivize specific behaviors by funding content access.
• Content Providers: Lower entry barriers and monetize content without traditional paywalls.
• Users: Access premium content or tools for free or at a discount by exchanging actions/data instead of money.

Built by qap, luis, Marcelo, Soko.

Yoga: Advanced Non-Fungible Position Management for LPs

Yoga introduces a sophisticated Non-Fungible (NF) position manager that empowers Liquidity Providers (LPs) to manage complex, multi-range positions within a single NFT. Unlike conventional position managers where each NFT represents only one price range, Yoga allows for the management of multiple sub-positions (different price ranges) under a single ERC721 token. This enables intricate liquidity distribution strategies across various price ranges, significantly enhancing capital efficiency for LPs.

The contract provides a straightforward Application Binary Interface (ABI), simplifying the process for LPs to specify desired modifications (liquidity increments). The contract then automatically calculates how to adjust the underlying UniV4 positions, streamlining complex liquidity management.

Built by Charlie Mack, Duncan Townsend, Luigi, Michael Fautch.

LensMint Web3 Camera: Authenticated Memories with On-Chain NFTs

The LensMint Web3 Camera is a groundbreaking hardware-based system that signs photos at the moment of capture, generating on-chain NFTs authenticated by zero-knowledge proofs. This ensures tamper-proof, verifiable memories, bringing unprecedented authenticity to digital media.

LensMint offers a complete hardware-to-blockchain camera system, meticulously designed to guarantee the authenticity and ownership of real-world photographs. Built around a Raspberry Pi camera, it integrates hardware-level cryptographic identity. Each photo is signed and hashed at the time of capture, verified for authenticity via zero-knowledge proofs generated by vlayer, and validated on-chain through RISC Zero. All media is then 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, facilitating proof of attendance, certified memories, and automated revenue sharing.

LensMint provides a trustless method to prove a photo’s device origin, timestamp, and integrity, solving critical issues of authenticity, provenance, and monetization for creators, journalists, event organizers, and scientific documentation.

Built by Mohit Bhat.

Halo: Transforming Real-World Receipts into On-Chain Rewards

Halo is a novel mini-application built on World Chain that converts physical shopping receipts into on-chain rewards for verified users. Users simply scan any retail receipt, which Halo then evaluates through a lightweight processing pipeline. Rewards are subsequently distributed to users verified with World ID, all while maintaining the user’s personal identity as private throughout the entire process.

Shopping receipts contain valuable insights into real-world economic behavior, yet this information is often lost or locked within siloed systems. Halo captures this data, processing each receipt to extract details such as merchant, timestamp, total amount, currency, and category. Rewards can only be claimed by unique, verified users, creating a sybil-resistant and privacy-preserving mechanism to link offline actions with on-chain incentives, unlocking new possibilities for loyalty programs and consumer analytics.

Built by hellocrypto, @DNC_Labs.

zkx402 (ProofofLeak): Zero-Knowledge Proofs for Verifiable Payments and Content

zkx402 is an innovative extension of the x402 protocol, integrating zero-knowledge proofs (ZKPs) to enable verifiable content and variable payments. This advancement allows for dynamic pricing tiers where users with verifiable identities, confirmed via zero-knowledge credentials, can receive discounts. Simultaneously, content producers can leverage ZKPs to attest to the provenance of their content, enhancing trust and authenticity.

Examples include: a specific journalist’s verified authorship, proof of human creation, or IoT data complete with GPS/sensor details. This protocol offers transformative applications:

• Whistleblowers can be compensated without revealing their identity.
• Journalists can access sensitive information at reduced costs by proving their human identity or affiliation with reputable media organizations.
• AI agents controlled by journalists can autonomously pay for access to private, sensitive data via x402 on Base, all while preserving privacy and verifiability.

Built by Guilherme, Lam, Ra’s Al Ghul, Mark Ballew, vaughn.

Aqua0: Cross-Chain Shared Liquidity with Aqua AMM and LayerZero

Aqua0 is a cutting-edge cross-chain shared liquidity mini-application that leverages the Aqua AMM and LayerZero messaging to enable seamless asset transfers across different blockchains. Aqua, developed by 1inch, is a shared liquidity layer designed to mitigate inefficiencies prevalent in current AMMs, such as:

• Underutilized Liquidity: Approximately 90% of AMM liquidity often remains unused, leading to stagnant capital.
• Fragmented Liquidity: This results in liquidity being scattered across various protocols and chains, with idle and unutilized capital held by different LPs.

Aqua0 enhances Aqua by transforming it into a cross-chain solution. While Aqua currently functions as an accounting layer usable on only one chain at a time, Aqua0 creates a truly cross-chain AMM marketplace. By combining LayerZero’s cross-chain components with Aqua’s shared liquidity contracts, Aqua0 empowers LPs to unlock new yield opportunities and significantly improve capital efficiency across the entire blockchain ecosystem.

Built by Yudhishthra Sugumaran, Andrei De Stefani, @tomasmazzi.

BMCP: Connecting Bitcoin and EVM Chains with True Cross-Chain Programmability

BMCP (Bitcoin Multi-Chain Protocol) establishes a robust connection between Bitcoin and EVM chains through genuine cross-chain programmability. This innovative protocol allows users to trigger EVM transactions—such as DeFi swaps, token transfers, or contract calls—by signing Bitcoin transactions using native Schnorr signatures (Taproot/BIP340).

At its core is the Cross-Chain Relay Engine (CRE), which diligently scans Bitcoin blocks. Upon detecting a valid, Schnorr-attested BMCP message embedded in an OP_RETURN, the CRE executes secure off-chain (risk management, validation) and on-chain (contract invocation) calls on EVM chains like Polygon and Ethereum, seamlessly utilizing Chainlink CCIP. BMCP ensures that all processes remain trust-minimized, cryptographically anchored to Bitcoin’s finality, and are composable across diverse blockchain ecosystems.

Built by Vibhav Sharma, Vollantre, James Scaur, Manuel.

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