samaypay

SamayPay system overview showing student, parent, and vendor dashboards with RFID-based Web3 payments and event tokens

Inspiration

Our inspiration came from observing how schools still depend heavily on cash for daily transactions such as canteen purchases, stationery payments, and school events. During cultural programs, sports days, and music events, we noticed recurring issues like cash mismanagement, counterfeit coupons, lack of transparency, and difficult post-event reconciliation.

Parents also have no real-time visibility into student spending, and schools rely on centralized systems that offer limited trust and accountability. This inspired us to explore how Web3, blockchain, and AI could create a transparent, secure, and intelligent alternative tailored specifically for educational ecosystems.

What It Does

SamayPay is a Web3-based cashless payment and event ecosystem for schools.

Enables RFID-based contactless payments for students

Stores all transactions on a blockchain ledger for immutability and trust

Provides real-time dashboards for students, parents, and vendors

Allows parents to define spending limits and receive instant alerts

Supports event-specific tokens for school fests, workshops, sports days, and music programs

Uses Gemini-powered intelligence to analyze spending and generate insights

How We Built It

SamayPay integrates cloud, blockchain, hardware, and AI technologies:

Frontend: Flutter (cross-platform mobile app)

Backend: Firebase (Authentication, Firestore, Cloud Functions, Notifications)

Blockchain Layer: Solana Smart Contracts

Hardware: ESP32 with RFID

AI Layer: Gemini for analytics and natural-language insights

System Flow RFID Tap → Backend Validation → Smart Contract Execution → Blockchain Ledger → Dashboard Update RFID Tap→Backend Validation→Smart Contract Execution→Blockchain Ledger→Dashboard Update

Parents can define a monthly spending limit:

$$ S_{\text{monthly}} \le L_{\text{parent}} $$

Transactions are approved only if:

$$ \text{Balance}{\text{student}} \ge \text{Amount} \;\land\; S{\text{current}} + \text{Amount} \le L_{\text{parent}} $$

Challenges We Ran Into

One major challenge was ensuring real-time user experience while using blockchain, which is inherently asynchronous. We optimized this by separating UI confirmation from on-chain settlement.

Another challenge was converting raw transaction data into meaningful insights. Parents do not want complex charts, so we used Gemini to transform analytics into simple natural-language summaries.

Hardware integration with ESP32 and RFID also required careful synchronization with backend and blockchain layers.

Accomplishments That We're Proud Of

Built an end-to-end Web3 system, not just a prototype

Successfully integrated RFID hardware, cloud backend, blockchain, and AI

Designed event-specific tokenization, extending beyond daily payments

Created a solution that balances innovation with real-world feasibility