The big news
Hand your AI agent the shopping list, not your card. SubGuard is a consumer payment firewall: agents can only request subscriptions or PromptPay QR payments, never approve them. Every request runs through a 16-check server-side rule engine that auto-pays, asks for your passkey, or blocks things like spoofed payees and quiet price hikes. Approved payments use single-use Pay Passes, and signed evidence is recorded on Avalanche Fuji. 'The model explains. The server decides.' It shows how people could finally trust AI agents with real purchases.
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What it does
A payment firewall for AI agents with request-only MCP and REST access, a 16-rule deterministic engine, single-use Pay Passes, WebAuthn passkey step-up approvals and Ed25519 evidence on Avalanche Fuji. Includes a simulated U-Topia U-Card payment flow. Built with Next.js, Node.js, Vite, PostgreSQL, Solidity, Stripe, OpenAI and ElevenLabs.
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Meet the team
This is an independent hackathon project. Some features may be prototypes. Please do your own research before relying on it.