jakiro
Written by: AIMan@Bitchain Vision
From August 15 to 17, 2025 ETHGlobal New York 2025 Hacking Matree was held in New York, and a total of 275 participating events were born in this 36-hour Hacking Matree.
On August 18, ETHGlobal New York announced 10 winning projects, namely: Swap Pay, Pumpkin Spice latte, Noah, Hardhat3-Ledger, Kyma Pay, x402-flash, Primer, TX Delay Insurance, and Rivals.
The following are the introductions of 10 award-winning projects:
Swap Pay
Swap Pay is an SDK that simplifies Web3 payments.Swap Pay With Chainlink data streams, users can view the prices of all tokens in their wallet in real time.This gives users a comprehensive understanding of the value of the remaining balance.At checkout, they simply choose the contribution amount of each token to pay PYUSD.With EIP-5792, users do not need to go through multiple redemptions, approvals and transactions, they only need to execute one transaction.
Demo address:https://swappay.netlify.app/
Pumpkin Spice latte
Pumpkin Spice Lattes is a bonus-linked savings app that turns boring DeFi gains into exciting jackpots.Users deposit stablecoins into shared pool.The principal is always safe, but the proceeds in the pool are used for regular draws.Winners will receive a generous “latte reward”, while unwinners will retain their deposit.It’s a fun and easy to get started, both making savings engaging and introducing user-friendly DeFi mechanisms.
Demo address:https://pumpkin-spice-latte.netlify.app/
Noah
Noah is a cryptocurrency inheritance and security system that connects digital assets with real-world verification for ultimate security.Noah ensures that no matter what happens to the user or the user’s key, its crypto assets will not be lost.
Noah utilizes deadlock switches and neutral incentives MEV mechanisms (to ensure maintenance without Noah intervention) to ensure that if there is no intervention from the owner within the specified time period (meaning they cannot access their wallet or themselves), funds will always be withdrawn and liquidated to the predetermined beneficiary address.
Demo address: https://ethnyc-2025-noah-qtx3-git-main-jtraversas-projects.vercel.app/
Hardhat3-Ledger
Hardhat3-Ledger adds Ledger wallet integration in Hardhat3, enabling secure hardware transaction signatures.
Hardhat3-Ledger adds Ledger wallet support to Hardhat 3 through the device-management-kit library, 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.With this integration, users can sign transactions on their ledger wallet when deploying smart contracts to any EVM network using hardhat 3.
Source code address: https://github.com/ericliujt/hardhat
Kyma Pay
Kyma Pay is an on-chain financial infrastructure that facilitates merchants to accept stablecoin payments that comply with the GENIUS Act: instant payments worldwide, with a fee of only one-tenth of Stripe (0.15% vs. Stripe’s 1.5% stablecoin payment fees).Kyma Pay supports PYUSD, USDC, USDT, and USDe.To achieve highly efficient stablecoin exchange between merchants and customers, Kyma Pay adopts the Orbital AMM design deployed on Arbitrum One.What’s unique about the design is that it applies the concept of UniswapV3 centralized liquidity to a new liquidity pool that supports hundreds of stablecoins, including PYUSD, UDSC, USDT, USDe, and more.
Source code:https://github.com/leeederek/kyma-pay
x402-flash
Support x402 micro payment, and the settlement delay overhead is zero.
x402-flash is a new solution designed to eliminate latency and will bring rich x402 expressions to the client.The Flash architecture works by using managed smart contracts to guarantee provider payments while enabling customers to access near-instant API responses, limited only by the amount locked in hosting.Both the creators and end users of x402 will benefit from it, they are able to conduct large-scale microtransactions and are limited only by funds in their self-custodial wallets.
Demo address: https://github.com/sleepysort/x402-flash
Primer
Primer is a Chrome extension that allows the crypto payment experience on Amazon to be seamless by using gift cards as an invisible settlement layer.
Primer embeds the “Checkout with Cryptocurrency” button directly into the Amazon order page and uses Amazon’s own design system for style design, thus bringing a native experience.After clicking, the user will connect to wallets such as Coinbase Wallet, MetaMask, or Phantom.They send USDC or other supported assets to our merchant address and use Coinbase’s CDP Data API to verify transactions immediately.After the funds are confirmed, the Primer backend will automatically purchase Amazon gift cards and apply them to the order.
Demo address: https://youtu.be/j6ciQXpH00o
TX Delay Insurance
TX Delay Insurance is designed to alleviate inconvenience and financial losses caused by transaction delays in Ethereum Virtual Machine (EVM) networks.It introduces a smart contract that acts as an insurance provider, allowing users to recover losses caused by delays without modifying the original transaction.The solution also uses an RPC proxy to record proof of transaction delays, enabling efficient claim handling.
Github address: https://github.com/jordan-public/transaction-delay-insurance/blob/main/demo/README.md
Rivals
An AR PVP shooting game that can fight zombies in the real world to earn RIVAL tokens.
Rivals is a revolutionary augmented reality (AR) multiplayer shooting game.Rivals combines immersive AR experiences with apps like Pokémon GO with the competitive intensity of first-person shooters to turn the real world into a competitive arena.It is not just a mobile game, but also a subtle fusion of Unity AR Foundation, blockchain economy and AI-driven gaming mechanisms, creating a lasting, location-based gaming ecosystem where players can compete for cryptocurrency rewards and give real monetary value to in-game achievements.
Demo address: https://rivals.nyc/
