Inspiration
In Nigeria and across Africa, people trade, gift and donate items every day, but swaps are rarely equal in value, so good trades fall apart.
What it does
Bybata is a trade-by-barter marketplace by Maximusinfotech Services where users trade, gift or donate items. For this hackathon we are adding an AI fair-value assistant that compares both sides of a trade, suggests a fair cash top-up with a plain-language reason, and lets the payer settle the difference through PayPal, with PayPal refunds if the trade is cancelled.
How we built it
Flutter mobile app, NestJS and Prisma backend, PostgreSQL, PayPal Orders v2 and Payments v2 (sandbox), and an LLM for valuation with a deterministic fallback.
Challenges we ran into
Keeping AI suggestions fair and explainable, and handling refunds cleanly.
What's next for Bybata
See docs/ROADMAP-PAYPAL-AI.md in the repo.
New in this build
- PayPal trade top-ups: when trade values differ, Bybata suggests a cash top-up, both sides accept or counter, then the difference is paid and refunded through PayPal.
- AI fair-value assistant that helps price the gap, with category price bands as fallback.
- Device voice input to describe items without typing.
Built With
- flutter
- nestjs
- openai
- paypal
- postgresql
- prisma
