HyperSplit

🧠 Project Name

HyperSplit

🔍 Description

HyperSplit is a bill-splitting app built on crypto rails that enables instant settlement. No more chasing friends for money or waiting for bank transfers - split dinner bills collaboratively, track debts across multiple events, and settle immediately on Hyper EVM with USDT.

Our hackathon prototype delivers a complete, end-to-end user experience, from seamless crypto on-ramping to final settlement. Looking ahead, we plan to integrate DeFi primitives to unlock the full power of crypto for our users—earn yield on settled funds, borrow against your Hyperliquid assets to pay for dinner, and more.

🛠️ How It Works

Tech Stack:

• On-ramp & Settlement
  • HyperEVM (core settlement layer)
  • LiFi (cross-chain routing)
  • Alchemy (Pricing and RPCs).
• Application: 
  • Swift (iOS App)
  • Go (Backend on Railway)
  • Supabase Postgres (Data Layer).
• User Experience
  • Privy (SMS OTP auth & embedded wallets)
  • Hyperliquid Names (Decentralized Identity).

Core Architecture:

1. Seamless On-Ramping:
   1. The user journey begins with a simple SMS OTP login via Privy, which generates an embedded wallet. Our state machine-driven on-ramp (WaitFunding → CreateRouteMsg → Route → Funded) uses LiFi to bridge funds from Base into USDT on Hyperliquid (to be expanded to more chains).
2. Collaborative Bill Creation
   1. Once funded, users can create bills and add items collaboratively in real-time, powered by Supabase for data synchronization.
3. Bill Subgraphs
   1. Each bill generates an isolated debt subgraph, tracking liabilities for a single event. This allows users to manage multiple, parallel bills without conflicts.
4. Main Debt Graph
   1. Once participants confirm a bill, its subgraph is merged into the main debt graph, which represents a user's total net balance across all their social activities.
5. Optimized Settlement
   1. We apply graph simplification algorithms to the main debt graph to find the most efficient settlement paths. This technology simplifies complex debt webs, reducing what could be 10 peer-to-peer IOUs into just 3-4 on-chain transactions.
6. Stateful Bill Lifecycle
   1. Bills progress through a clear lifecycle: Draft → Awaiting Payment → Paid. Settlement is executed via on-chain transactions on Hyper EVM, permanently resolving the debts and locking the bill.

💻 Demo

- YouTube: https://youtu.be/sc9Pl0Zu5uY

- X: https://x.com/akhtariev/status/1959838233199837289

📂 Project Links

• Code
  • https://github.com/czarcas7ic/hsplit-chain-be
• Backend Architecture Docs
  • https://p0mvn.github.io/hypersplit/
• Live Demo
  • Running backend: `https://hsplit-be-production.up.railway.app`

👥 Team

• Adam Tucker - x.com/adamleetucker17
• Roman Akhtariev - x.com/akhtariev
• Jon Ator - x.com/jon_ator