Moutstr

Decentralized AI

Inspiration

AI should be accessible to anyone with Bitcoin no accounts, no API keys, no KYC. In Africa, most people are excluded from AI tools because they lack credit cards or can't pass identity verification. Moutstr fixes that.

What it does

Moutstr is a decentralized AI chat marketplace built on Bitcoin and Nostr. Users deposit Cashu ecash tokens and pay per message sats flow directly to AI model providers via the Routstr protocol. No login, no subscription, no data collection.

Browse and select from dozens of AI models
Pay per message using Cashu ecash (Lightning deposits)
Change tokens returned automatically after each message
Works on any device, no app install required (PWA)
Fully open source, self-hostable

How we built it

React 19 + Vite PWA frontend
cashu-ts for Cashu ecash token management
Routstr API for AI model routing and payment
Dexie (IndexedDB) for local chat and wallet persistence
Zustand for state management
Deployed on Vercel

Challenges

The biggest challenge was the Cashu payment flow , specifically handling the X-Cashu change header correctly so users don't lose sats when a model costs more than their balance. We studied the Routstr reference implementation and fixed the token management logic to preserve funds on 402 errors.