Original Article Title: "ETHGlobal NYC Hackathon Wrap-up: Summary of Top 10 Awarded Projects"

Original Article Author: jk, Odaily Planet Daily

The ETHGlobal New York 2025 hackathon, which lasted for an entire weekend, has officially come to a close. As one of the world's leading Web3 developer events, this hackathon attracted numerous developer teams to explore new blockchain technology applications. After the judging process, ten projects received final awards, covering various areas such as gaming, payments, DeFi, and development tools.

The ETHGlobal New York event provided developers with a platform to experiment with Web 3 technology, where participants could develop innovative projects, learn new technologies, expand their professional networks, and engage with peers. During the event, developers utilized various blockchain protocols and tools to build projects covering multiple use cases.

Odaily participated in the ETHGlobal New York event activities and will introduce the award-winning projects below.

Rivals: Augmented Reality Shooter Game

Rivals is a multiplayer shooter game that combines AR technology and blockchain economics. In the game, players engage AI-controlled zombies in a real-world environment through their smartphones. Killing zombies rewards players with RIVAL tokens, while dying results in a loss of some token balance. The game uses Unity AR Foundation to achieve environment recognition, allowing virtual zombies to navigate and interact in the player's actual space.

The game features a geolocation trap system where players can set traps at specific GPS coordinates to affect other players. The project supports multiple blockchain networks such as Flow and Chiliz and utilizes a cross-chain tokenomics model. This design combines location services, AR technology, and cryptocurrency incentives to create a new mobile gaming experience.

Primer: Cryptocurrency Shopping Payment Solution

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, this extension facilitates payment conversion through gift cards as an intermediary layer. After clicking the injected "Cryptocurrency Checkout" button, users can complete the payment using stablecoins like USDC.

The system automatically converts the cryptocurrency to an Amazon gift card in the background and applies it to the order, making the entire process transparent to the user. The extension integrates with mainstream wallets such as Coinbase Wallet, MetaMask, and Phantom and uses the Coinbase CDP API for transaction validation. This approach bypasses the limitations of traditional e-commerce platforms not supporting cryptocurrency, providing digital asset holders with a new consumption channel.

Swap Pay: Multi-Asset Composite Payment

Swap Pay addresses the token compatibility issue in Web 3 payments. This SDK allows users to make composite payments using multiple assets from their wallets without the need to pre-convert them into a single token specified by the merchant. The system leverages Chainlink Price Feeds to provide real-time asset valuations, and users can select the quantities of different assets to meet the payment amount.

Through the EIP-5792 standard, all authorization, exchange, and transfer operations are bundled into a single transaction for execution, streamlining the payment process. Final settlement is done in PYUSD, and if the total value of the selected assets exceeds the required amount, the system automatically refunds the difference. This design reduces the operational complexity in Web3 commerce, enabling decentralized asset balances to be more efficiently utilized 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 liquidity pool where the principal remains secure, but all generated yields from deposits are pooled for regular lottery drawings. Winners receive bonus yield rewards, while non-winners retain their full principal.

The project supports yield sources following the ERC-4626 standard, including DeFi protocols like Morpho and Kinetic. Random number generation uses Flare and Flow's VRF service to ensure fairness. This model aims to make savings more attractive while providing users with a risk-free way to participate without risking their principal.

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. The integration utilizes Ledger's device management toolkit, supports TypeScript, and completes testing on a Ledger Flex device.

The project team also provided improvement suggestions to the Ledger developer documentation, including code example optimizations and document structure adjustments. This integration is valuable for blockchain projects that require a high security standard in development, allowing developers to maintain security while using modern development tools.

Noah: Digital Asset Inheritance Scheme

Noah provides a digital asset inheritance solution that automates estate transfer through smart contracts. The system uses a "dead man's switch" mechanism, which automatically transfers assets to a specified beneficiary if the user is inactive for a set period. The project supports various settlement methods, including Dutch auctions and Uniswap trading.

The system can convert digital assets into USDC or PYUSD and can also be directly converted to USD through the Fern service. For users opting for fiat off-ramp, the beneficiary can inherit the assets without needing to understand cryptocurrency. Noah also supports ENS domain inheritance and has been deployed on multiple blockchain networks such as Flow, Chiliz, and Katana.

Kyma Pay: Merchant Stablecoin Payment Infrastructure

Kyma Pay offers merchants stablecoin payment processing services compliant with the GENIUS Act, with a fee rate of 0.15%, significantly lower than traditional payment processors like Stripe, which charge 1.5%. The system supports major stablecoins such as PYUSD, USDC, USDT, and USDe, utilizing an AMM based on the Orbital design for efficient stablecoin swaps.

The project integrates the HTTP 402 payment protocol, returning a 402 status code with payment information when a customer attempts to make a purchase, handled by Coinbase x 402 Facilitator for payment validation. The system also includes stablecoin risk assessment, providing merchants with a risk score 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 a transaction is delayed due to network congestion. The system records transaction broadcast and execution timestamps via RPC proxies as proof of delay.

The insurance contract allows users to purchase delay protection for specific transactions, with claims based on verifiable timestamp data. This mechanism is particularly valuable for DeFi operations, arbitrage trades, and other time-sensitive scenarios, providing users with a tool to combat network uncertainty.

x 402-flash: Micro Payment Delay Optimization

x 402-flash addresses the latency issue in the x 402 micro payment standard through a hosted contract system. Traditional x402 requires confirmation of blockchain transactions before responding to API requests, whereas the flash solution allows clients to pre-lock funds in a hosted contract, enabling immediate server responses and accelerating the payment process through micro-insurance.

Actual payment is processed asynchronously in the background. If the client's balance is insufficient, the escrow contract will automatically deduct the prepaid funds. This design reduces payment latency from 200 milliseconds to double-digit milliseconds, enabling high-frequency API calls. The project has integrated Circle Paymaster, which supports paying gas fees in USDC, streamlining the user experience.

Pika Vault: Cross-Chain Asset Management Vault

Pika Vault has achieved cross-chain asset management, allowing users to deposit and withdraw assets on any supported blockchain, while the vault holds and reallocates the portfolio across multiple chains. The system is based on the ERC-4626 standard and supports asynchronous redemptions under ERC-7540. Unlike solutions relying on synthetic assets or complex bridging, Pika Vault utilizes native USDC and Circle CCTP for cross-chain transfers.

The architecture separates the control plane from the value plane, with LayerZero handling cross-chain coordination and Chainlink CCIP providing price data. The system supports qualified custodian addresses to meet institutional investors' regulatory requirements. This design achieves true cross-chain asset management, avoiding single-chain limitations and synthetic asset risks.

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