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PayGuard AI
AI shopping agents with smart blockchain-based authorization — built at the EasyA x Algorand Harvard Hackathon.
Overview
Built PayGuard AI at the EasyA x Algorand Harvard Hackathon — a platform where GPT-4-powered AI agents shop on your behalf within authorized spending limits. Auto-approves purchases under the limit, requires manual approval for larger ones, and settles payments on Algorand with 2.8-second finality. Features TEALScript smart contracts, Pera Wallet integration, and real-time SSE notifications.
Key Achievements
Built a fully functional AI shopping platform with blockchain payments in 36 hours
Deployed TEALScript smart contract on Algorand TestNet with agent wallet management
Implemented auto-approval logic for sub-limit purchases and SSE real-time notifications
Integrated GPT-4 function calling for intelligent product search and budget-aware recommendations
Tech Stack
Next.jsTypeScriptOpenAI GPT-4AlgorandTEALScriptTursoPera WalletTailwind CSSshadcn/uiBlockchain