Original Title: (ETHGlobal NYC Hackathon Concludes: Summary of the Top Ten Awarded Projects)
Original Author: jk, Odaily Planet Daily
The ETHGlobal New York 2025 hackathon, spanning an entire weekend, has officially concluded. As one of the major Web3 developer events globally, this hackathon attracted numerous developer teams exploring new application scenarios for blockchain technology. After review, ten projects were awarded final prizes, covering various fields such as gaming, payments, DeFi, and development tools.
ETHGlobal New York provided developers with a platform to experiment with Web 3 technologies, where participants could develop innovative projects, learn new skills, expand their professional networks, and engage with peers. During the event, developers built projects covering various application scenarios using different blockchain protocols and tools.
Odaily participated in the ETHGlobal New York-related activities and will introduce the awarded projects in the following text.
Rivals: Augmented Reality Shooting Game
Rivals is a multiplayer shooting game combining AR technology and blockchain economics. Players fight against AI-controlled zombies in real environments using their smartphones, earning RIVAL tokens as rewards for defeating zombies, while losing some token balance upon death. The game utilizes Unity AR Foundation for environmental recognition, allowing virtual zombies to navigate and interact within the player's actual space.
The game includes a geolocation trap system, allowing players to set traps at specific GPS coordinates to affect other players. The project supports multiple blockchain networks such as Flow and Chiliz, adopting a cross-chain token economic model. This design combines location services, AR technology, and cryptocurrency incentives to create a new mobile gaming experience.
Primer: Cryptocurrency Shopping Payment Method
Primer is a Chrome browser extension that enables users to make purchases on Amazon using cryptocurrency. Since Amazon does not directly support digital asset payments, the extension facilitates payment conversion through gift cards as an intermediary layer. Users can complete payments using stablecoins like USDC by clicking the injected 'Cryptocurrency Checkout' button.
The system automatically converts cryptocurrency into Amazon gift cards in the background and applies it to the order, making the entire process transparent to the user. It extends integration with mainstream wallets like Coinbase Wallet, MetaMask, and Phantom, using the Coinbase CDP API for transaction validation. This method circumvents the limitations of traditional e-commerce platforms that do not support cryptocurrencies, providing digital asset holders with new consumption channels.
Swap Pay: Multi-Token Combination Payment
Swap Pay addresses the token compatibility issue in Web 3 payments. The SDK allows users to pay using a combination of multiple tokens in their wallet without needing to exchange them for a single token designated by the merchant beforehand. The system uses Chainlink data sources to provide real-time token valuations, allowing users to select different token quantities to meet the total payment amount.
Through the EIP-5792 standard, all authorization, redemption, and transfer operations are packaged into a single transaction, simplifying the payment process. The final settlement uses PYUSD, and if the total value of the selected tokens exceeds the required amount, the system automatically refunds the difference. This design reduces operational complexity in Web3 commerce, allowing dispersed token balances to be used more effectively for payments.
Pumpkin Spice Latte: Rewarding Savings Application
Pumpkin Spice Latte combines DeFi yields with a lottery mechanism, creating a new savings incentive model. Users deposit stablecoins into a shared fund pool, where the principal remains secure, but all earnings generated from deposits are pooled for regular lottery draws. Winners receive excess yield rewards, while non-winners retain their full principal.
The project supports yield sources compliant with the ERC 4626 standard, including DeFi protocols like Morpho and Kinetic. The random number generation uses VRF services from Flare and Flow to ensure fairness. This model aims to make saving more attractive while providing users with a way to participate without principal risk.
Hardhat 3-Ledger: Hardware Wallet Development Integration
Hardhat 3-Ledger adds Ledger hardware wallet support to the latest version of the Hardhat development framework. Developers can securely sign smart contract deployment transactions using Ledger devices, avoiding exposing private keys in the development environment. Integrated with Ledger's device management toolkit, it supports TypeScript and completes testing on Ledger Flex devices.
The project team also provided suggestions for improving the Ledger developer documentation, including code sample optimization and documentation structure adjustments. This integration has practical value for blockchain project development that requires high-security standards, allowing developers to use modern development tools while maintaining security.
Noah: Digital Asset Inheritance Solution
Noah provides a digital asset inheritance solution that automates estate transfer through smart contracts. The system uses a 'dead man's switch' mechanism, automatically transferring assets to designated beneficiaries if the user is inactive for a set period. The project supports various liquidation methods, including Dutch auctions and Uniswap transactions.
The system can convert digital assets to USDC or PYUSD, or directly to USD through the Fern service. For users who choose fiat withdrawals, beneficiaries do not even need to understand cryptocurrencies to inherit assets. Noah also supports ENS domain name inheritance and has been deployed on multiple blockchain networks such as Flow, Chiliz, and Katana.
Kyma Pay: Merchant Stablecoin Payment Infrastructure
Kyma Pay provides merchants with stablecoin payment processing services compliant with the GENIUS Act, with a transaction fee rate of 0.15%, significantly lower than traditional payment providers like Stripe, which charge 1.5%. The system supports major stablecoins such as PYUSD, USDC, USDT, and USDe, utilizing an AMM designed based on Orbital for efficient stablecoin swaps.
The project integrates the HTTP 402 payment protocol, returning a 402 status code with payment information when the customer attempts to make a purchase, handled by Coinbase x 402 Facilitator for payment validation. The system also includes a stablecoin risk assessment feature, providing merchants with risk scores based on reserve assets, audit history, and other data. This design aims to offer merchants a more cost-effective digital currency payment option.
TX Delay Insurance: Transaction Delay Insurance
TX Delay Insurance provides insurance services for transaction delays on EVM networks. Users can purchase insurance for time-sensitive transactions, receiving economic compensation if the transaction is delayed due to network congestion. The system records the broadcast and execution timestamps of transactions through RPC proxies as proof of delay.
Insurance contracts allow users to purchase delay protection for specific transactions, with claims based on verifiable timestamp data. This mechanism has practical value for time-sensitive scenarios such as DeFi operations and arbitrage trading, providing users with tools to combat network uncertainties.
x 402-flash: Micro-Payment Delay Optimization
x 402-flash solves the delay issue in the x 402 micropayment standard through an escrow contract system. Traditional x402 requires waiting for blockchain transaction confirmations before responding to API requests, while the flash solution allows clients to pre-lock funds in the escrow contract, enabling servers to respond immediately to requests and accelerate the payment process with small insurance.
Actual payments are processed asynchronously in the background; if the client's balance is insufficient, the escrow contract automatically deducts from the pre-stored funds. This design reduces payment delays from 200 milliseconds to the double-digit millisecond range, enabling high-frequency API calls. The project integrates Circle Paymaster, supporting gas fees paid in USDC, simplifying the user experience.
Pika Vault: Cross-Chain Asset Management Vault
Pika Vault enables cross-chain asset management, allowing users to access assets on any supported blockchain, while the vault holds and reallocates portfolios across multiple chains. The system is based on the ERC-4626 standard and supports asynchronous redemption features of ERC-7540. Unlike solutions that rely on synthetic assets or complex bridging, Pika Vault uses native USDC and Circle CCTP for cross-chain transfers.
The architecture separates the control plane and value plane, with LayerZero handling cross-chain coordination and Chainlink CCIP providing price data. The system supports qualified custody addresses to meet regulatory requirements for institutional investors. This design achieves true cross-chain asset management, avoiding single-chain limitations and synthetic asset risks.
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