UI/UX Layer
This layer abstracts DeFi access into the simplest possible interface: a feature phone. It is composed of three technical subcomponents:
1- USSD Menu Interface
Powered by Kotani Pay and Yellow Card's programmable USSD gateway
Users dial a short code (e.g.,
*889#) and follow simple menu flows:
Each action translates into a backend call that maps to a blockchain transaction
2- SMS Notifications
Users receive weekly balance updates, deposit confirmations, and yield accrual alerts
Localization supported (e.g. Swahili, Hausa, Spanish)
3- Mobile Money Deposit/Withdrawal
Yellow Card APIs and Kotani Pay facilitate:
Fiat ↔ USDC conversions
Secure, real-time mobile money interactions
Agent-based onboarding (future extension)
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