UNTIL

Skill-based quiz. Pay per question. Stop when it's optimal.

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Links

• Demo Video:
• Whitepaper: until/whitepaper
• Live webapp: until

Tech stack

Layer	Stack
Frontend	Next.js 16, React 19, TypeScript, Tailwind, Stacks Connect
Backend	Node.js, Express, TypeScript
Data	MongoDB (Mongoose), Redis
Chain	Stacks (STX), x402

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Repo structure

• client/ — Next.js app (App Router)
• server/ — Express API (credits, questions, runs, users)
• docs/ — Whitepaper (source), roadmap, audit

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Quick start

# Client
cd client && npm install && npm run dev

# Server (separate terminal; needs Mongo, Redis, .env)
cd server && npm install && npm run dev

See client/.env.example and server/.env.example for required env vars.