Fusion Jar

Demo

About

🧪 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 2. 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. 3. 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. 4. 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. 5. 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

How it's made

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.