Overview of the Top Ten Winning Projects at ETHGlobal NewYork 2025 Hackathon

Written by: AIMan@Golden Finance

The ETHGlobal New York 2025 hackathon will be held in New York from August 15 to 17, 2025, during which a total of 275 participating projects were born in this 36-hour hackathon.

On August 18, ETHGlobal New York announced 10 winning projects, which are: Swap Pay, Pumpkin Spice latte, Noah, Hardhat3-Ledger, Kyma Pay, x402-flash, Primer, TX Delay Insurance, Rivals.

Below are brief introductions to 10 award-winning projects:

Swap Pay

Swap Pay is an SDK that simplifies Web3 payments. With the help of Chainlink data streams, users can view the prices of all tokens in their wallets in real-time. This allows users to have a comprehensive understanding of the value of their balances. At checkout, they simply need to select the contribution amount for each token to pay with PYUSD. By using EIP-5792, users do not have to go through multiple exchanges, approvals, and transactions; they only need to execute one transaction.

Demo address:

Pumpkin Spice latte

Pumpkin Spice Lattes is a savings application linked to bonuses that transforms the dull DeFi earnings into exciting prizes. Users deposit stablecoins into a shared pool. The principal is always safe, but the earnings in the pool are used for regular lottery draws. Winners will receive generous “latte rewards,” while non-winners keep their deposits. It is a fun and easy-to-use way to make savings engaging while introducing user-friendly DeFi mechanisms.

Demo address:

Noah

Noah is a cryptocurrency inheritance and security system that connects digital assets with real-world verification for ultimate security. Noah ensures that regardless of what happens to the user or the user's keys, their encrypted assets will not be lost.

Noah utilizes a deadlock switch and neutral incentive MEV mechanism (to ensure maintenance without Noah's intervention) to ensure that if there is no owner intervention within the specified time (meaning they cannot access their wallets or themselves), the funds will always be withdrawn and liquidated to the designated beneficiary address.

Demo address:

Hardhat3-Ledger

Hardhat3-Ledger adds Ledger wallet integration in Hardhat3, enabling secure hardware transaction signing.

Hardhat3-Ledger adds Ledger wallet support to Hardhat 3 through the device management toolkit (device-management-kit), enabling developers to seamlessly integrate Ledger hardware wallets with the latest version of Hardhat. This allows developers to integrate hardware-based secure signatures for transactions, messages, and typed data when creating projects using Hardhat 3. Through this integration, users can sign transactions on their ledger wallets when deploying smart contracts to any EVM network using Hardhat 3.

Source code address:

Kyma Pay

Kyma Pay is an on-chain financial infrastructure that facilitates merchants in accepting stablecoin payments compliant with the GENIUS Act: global instant payments with fees only one-tenth of Stripe's (0.15% vs Stripe's 1.5% stablecoin payment fee). Kyma Pay supports PYUSD, USDC, USDT, and USDe. To achieve highly efficient stablecoin exchanges between merchants and customers, Kyma Pay utilizes the Orbital AMM design deployed on Arbitrum One. The uniqueness of this design lies in its application of the concentrated liquidity concept from Uniswap V3 to a new type of liquidity pool that can support hundreds of stablecoins, including PYUSD, UDSC, USDT, USDe, and more.

Source code:

x402-flash

Support for x402 micropayments, with zero settlement delay costs.

x402-flash is a new solution designed to eliminate latency, bringing rich x402 expressions to clients. The Flash architecture works by using managed smart contracts to guarantee payments to providers while allowing customers to access nearly instant API responses, limited only by the amounts locked in the managed service. Both the creators of x402 and the end users will benefit from this, enabling them to perform large-scale microtransactions, limited only by the funds in their self-custody wallets.

Demo address:

Primer

Primer is a Chrome extension that allows gift cards to act as an invisible settlement layer, making the cryptocurrency payment experience on Amazon seamless.

Primer embeds the “Checkout with Cryptocurrency” button directly into the Amazon order page and styles it using Amazon's own design system, providing a native experience. Upon clicking, users will connect to wallets like Coinbase Wallet, MetaMask, or Phantom. They will send USDC or other supported assets to our merchant address and immediately verify the transaction using Coinbase's CDP Data API. Once the funds are confirmed, Primer's backend will automatically purchase Amazon gift cards and apply them to the order.

Demo address:

TX Delay Insurance

TX Delay Insurance aims to alleviate the inconveniences and financial losses caused by transaction delays in the Ethereum Virtual Machine (EVM) network. It introduces a smart contract that acts as an insurance provider, allowing users to recover losses caused by delays without altering the original transaction. This solution also uses RPC proxies to document proof of transaction delays, enabling efficient claims processing.

Github address:

Rivals

An AR PVP shooting game where you can fight zombies in the real world to earn RIVAL tokens.

Rivals is a revolutionary augmented reality (AR) multiplayer shooting game. Rivals combines the immersive AR experience of applications like Pokémon GO with the competitive intensity of first-person shooters, transforming the real world into a competitive gaming arena. It is not just a mobile game; it is a clever integration of Unity AR Foundation, blockchain economy, and AI-driven game mechanics, creating a lasting, location-based gaming ecosystem where players can compete for cryptocurrency rewards, giving real monetary value to in-game achievements.

Demo address: