Fusion Jar

🧪 Fusion Jar — Description

Fusion Jar is a gamified, gasless, cross-chain micro-investment platform built on top of 1inch Fusion+ and powered by Privy wallets. It allows users to automate recurring, low-cost crypto investments (e.g., $1–$10) across major EVM chains (Ethereum, Base, Polygon, Arbitrum) without worrying about gas fees, chain switching, or complex wallet management.

The goal is to democratize DeFi by making long-term crypto investing as easy as setting up a recurring deposit — even for beginners. Users can create personalized “Jars” (intent-based investment plans), which execute periodic token swaps using the gasless, decentralized auction-based Fusion+ protocol.

Key Features

1. Recurring Micro-Investments ("Jars")

• Users define:
  • Amount to invest (e.g., $1 every week)
  • Target token (e.g., ETH, MATIC, OP)
  • Chain (e.g., Polygon, Base)
  • Frequency (Daily, Weekly, Monthly, or Custom)
• The system periodically executes the swap using 1inch Fusion+, which means:
  • No gas fees
  • No relayers or batching
  • Best execution price via auction

1. Smart Wallet Integration (via Privy)

• Fusion Jar leverages Privy’s embedded smart wallets, giving every user a gasless, non-custodial wallet experience without needing MetaMask.
• Users sign in via email or OAuth.
• Wallets are controlled by the user and stored securely via Privy, enabling seamless recurring execution.

1. Cross-Chain Execution

• Users can invest in tokens across multiple chains from a single UI.
• Fusion+ supports native token swaps on Base, Polygon, Ethereum, and Arbitrum.
• The system checks balances and executes the intended swaps periodically per Jar configuration.

1. Gamification Layer

• Every successful Jar execution gives users:
  • XP points
  • Streaks for continuous investment
  • Badges for milestones (e.g., “7-Day Streak”, “Early Minter”)
• This boosts engagement, retention, and makes investing fun.

1. Customization & Power User Controls

• Users can:
  • Name their Jars (e.g., "My ETH DCA")
  • Set slippage tolerance, deadline, and execution time window
  • View swap history and performance per Jar
  • Enable/disable individual Jars

How It Works

1. User signs in via Privy.
2. Creates a Jar with desired configuration (e.g., $5 every Monday into ETH on Base).
3. Approves token (if needed) for USDC (or any supported token).
4. A cron job on the backend monitors all active Jars every 30 minutes:
   • Checks wallet balance
   • Builds Fusion+ swap quote
   • Signs and submits the transaction using the user's Privy wallet
   • Stores execution logs in the database
5. Gamified feedback and XP are updated per execution.

Why Fusion Jar?

• Solves DeFi UX and onboarding problems by abstracting away:
  • Gas
  • Chain switching
  • Manual wallet actions
• Encourages financial consistency and discipline
• Makes recurring investing accessible, cheap, and even fun

Fusion Jar is built as a full-stack Web3 product with deep integration into 1inch Fusion+, Privy, and multiple EVM-compatible chains. Below is a breakdown of how the system is architected and implemented:

Frontend:

• The UI is built using Next.js with TailwindCSS and shadcn/ui for minimal, modern component styling.
• It includes dynamic form builders for creating "Jars" (micro-investment intents) and a dashboard to view streaks, XP, performance, and execution logs.
• Wallet connection and authentication are powered by Privy, allowing users to sign in via email or OAuth and get access to an embedded smart wallet with no setup.

Backend:

• The backend is a Node.js and TypeScript app using Express and cron-based services.
• A scheduled cron job runs every 30 minutes, querying the investment_intents table for active intents.
• For each active Jar:
  • It checks the user's Privy smart wallet balance on the respective chain.
  • If funds are sufficient, it fetches a Fusion+ quote using the 1inch API (with our partner access key).
  • It signs and submits the transaction using the Privy wallet's private key.
  • Logs the transaction to the investment_executions table, tagging it as success or failure.

Partner Tech Integrations:

• 1inch Fusion+: The entire gasless, auction-based swapping mechanism is built on top of 1inch’s Fusion+ protocol. It allows decentralized execution with optimal pricing and no relayers or batching hacks. Their SDK and partner API access enabled faster prototyping.
• Privy: Privy smart wallets made the product possible. It enabled gasless, non-custodial wallets for every user without requiring them to install MetaMask. We store wallet metadata securely and use wallet keys for executing scheduled swaps.
• QuickNode and Alchemy: Used as RPC providers for accessing multiple EVM chains and monitoring wallet balances.

Notable Hacks:

• We wrote a multi-chain wallet checker and gasless swap builder that can dynamically adjust quotes across Ethereum, Polygon, Base, and Arbitrum, choosing the best time for execution depending on Fusion+ liquidity.
• Fusion Jar simulates “subscription-style investing” without ever needing ongoing user interaction. All actions — signing, execution, retries — happen fully server-side in a secure way via Privy.
• The gamification engine runs in parallel: for every successful execution, it awards XP, updates streaks, and assigns badges — all tracked in a dedicated engagement table.

Overall, the project bridges real DeFi infrastructure with seamless UX and growth mechanics, using 1inch Fusion+ and Privy as the technical backbone.