Fraction

@sandman-sh·Rohit 💫·9 followers·added 2026-07-19

Fraction is an infinite vector design canvas with pay-per-use pricing. The React/Vite editor, centered on src/CustomCanvas.tsx and src/App.tsx, is free for drawing, styling, and layout work. Premium operations run through an Express gateway in server.ts built on createGatewayMiddleware from @circle-fin/x402-batching: endpoints like POST /api/export-svg return an HTTP 402 challenge, the user's wallet signs an EIP-712 TransferWithAuthorization, and Circle's facilitator settles fraction-of-a-cent USDC batches on Arc Testnet. The same gateway prices KIRO, an in-canvas AI design auditor focused on alignment, contrast, and grid precision. Vercel deployment is wired up through api/index.ts and vercel.json.