Grant Application: SAND-Powered Gift Card Marketplace on Polygon
Project Overview
We propose building an online gift card marketplace where users can purchase digital gift cards from top brands using SAND tokens on the Polygon network. This platform will bridge the gap between the metaverse economy and real-world commerce, creating new utility for SAND tokens while offering crypto holders a frictionless way to spend their digital assets.
Project Name: Seed Gift
Requested Grant: $12,000 USDC worth of SAND tokens
Project Duration: 4 months
Technical Stack: React.js, Node.js, Express, PostgreSQL, Ethers.js, Polygon, IPFS
Technical Implementation
Architecture
Frontend (React)
│
├──> Backend API (Node.js/Express)
│ ├──> Database (PostgreSQL)
│ ├──> Payment Processor
│ └──> Gift Card API Integration
│
└──> Blockchain Layer
├──> SAND Token Contract (Polygon)
├──> Payment Verification
└──> IPFS (Gift Card delivery)
Core Components
1. Smart Contract (Payment Processor)
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
contract SandGiftPayment {
address public owner;
IERC20 public sandToken;
uint256 public feePercentage = 2; // 2% platform fee
event PaymentProcessed(
address indexed buyer,
uint256 orderId,
uint256 amount,
uint256 timestamp
);
constructor(address _sandTokenAddress) {
owner = msg.sender;
sandToken = IERC20(_sandTokenAddress);
}
function processPayment(
uint256 orderId,
uint256 amount
) external {
uint256 fee = (amount * feePercentage) / 100;
uint256 netAmount = amount - fee;
require(
sandToken.transferFrom(msg.sender, address(this), amount),
"Transfer failed"
);
// Transfer fee to platform wallet
sandToken.transfer(owner, fee);
emit PaymentProcessed(
msg.sender,
orderId,
amount,
block.timestamp
);
}
}
2. Backend Payment Verification
const { ethers } = require('ethers');
const PaymentABI = require('./SandGiftPayment.json');
const verifyPayment = async (orderId, userAddress) => {
const provider = new ethers.providers.JsonRpcProvider(
process.env.POLYGON_RPC_URL
);
const paymentContract = new ethers.Contract(
process.env.PAYMENT_CONTRACT_ADDRESS,
PaymentABI.abi,
provider
);
const filter = paymentContract.filters.PaymentProcessed(
userAddress,
orderId
);
const events = await paymentContract.queryFilter(filter);
return events.length > 0;
};
3. Gift Card Delivery System
const axios = require('axios');
const { create } = require('ipfs-http-client');
const ipfs = create({ url: process.env.IPFS_API_URL });
const deliverGiftCard = async (order) => {
// Generate encrypted gift card data
const cardData = {
code: generateGiftCode(),
pin: generatePin(),
value: order.amount,
brand: order.brand,
expires: new Date(Date.now() + 365 * 24 * 60 * 60 * 1000) // 1 year
};
// Store on IPFS
const { cid } = await ipfs.add(JSON.stringify(cardData));
const ipfsUrl = `https://ipfs.io/ipfs/${cid.toString()}`;
// Store encrypted reference in DB
await storeEncryptedReference(order.id, encryptData(ipfsUrl));
// Send email to user with decryption instructions
await sendEmail(order.email, ipfsUrl, decryptionKey);
};
Roadmap & Milestones
Milestone 1: Platform Foundation (Month 1)
Objectives: Core infrastructure setup, smart contract deployment, basic UI
- Tasks:
- Smart contract development.
- Database schema design
- Initial UI components (React)
- Polygon testnet deployment
- Basic API endpoints
Budget Allocation: $3,000
- Smart Contract Development: $1,500
- Backend Architecture: $800
- UI Framework: $700
Milestone 2: Core Functionality (Month 2)
Objectives: Payment integration, gift card API connections, user accounts
- Tasks:
- SAND payment integration (Polygon mainnet)
- Gift card supplier API integration (Tango Card/Bitrefill)
- User authentication system
- Order processing workflow
- Basic admin dashboard
Budget Allocation: $4,000
- Payment Gateway Integration: $1,500
- Gift Card API Integration: $1,200
- User System Development: $800
- Admin Dashboard: $500
Milestone 3: Enhanced Features (Month 3)
Objectives: Advanced features, IPFS delivery, mobile optimization
- Tasks:
- IPFS-based gift card delivery
- SAND price oracle integration
- Mobile-responsive design
- Transaction history
- Email notifications
- Security audits
Budget Allocation: $3,000
- IPFS Integration: $800
- Mobile Optimization: $700
- Security Auditing: $900
- Notification System: $600
Milestone 4: Launch & Marketing (Month 4)
Objectives: Platform launch, initial marketing, analytics
- Tasks:
- Final testing and bug fixes
- Production deployment
- Basic marketing materials
- Analytics integration
- Documentation
- First 100 gift cards giveaway
Budget Allocation: $2,000
- Deployment & DevOps: $800
- Marketing Materials: $600
- Analytics Setup: $400
- Documentation: $200
Budget Breakdown
| Milestone | Description | Budget Allocation | Deliverables |
|---|---|---|---|
| 1 | Platform Foundation | $3,000 | Smart contracts, basic UI, API structure |
| 2 | Core Functionality | $4,000 | Payment processing, supplier integration, user system |
| 3 | Enhanced Features | $3,000 | IPFS delivery, mobile optimization, security |
| 4 | Launch & Marketing | $2,000 | Production deployment, marketing, analytics |
| Total | $12,000 |
Why Sandbox?
- SAND Utility Expansion: Creates real-world spending options for SAND token holders
- Polygon Ecosystem Growth: Enhances Polygon’s commercial use cases
- Metaverse Commerce Bridge: Connects virtual economies with physical goods
- User Acquisition: Attracts new users to the Sandbox ecosystem
- Innovation Showcase: Demonstrates practical applications of blockchain technology
Team
Our team consists of:
- 1 full-stack blockchain developers (5+ years experience)
- 1 UI/UX designer specializing in web3 applications
- Advisors from established gift card distribution companies
Post-Grant Plan
- Implement 0.5% burn mechanism for all SAND transactions
- Add support for additional metaverse tokens
- Develop Sandbox-themed gift cards
- Integrate with Sandbox avatar system for personalized shopping
- Launch mobile app with AR gift card visualization
Conclusion
Seed Gift will create a valuable new utility for SAND tokens while establishing a bridge between the metaverse and real-world commerce. By leveraging Polygon’s low fees and fast transactions, we’ll deliver a seamless user experience that positions SAND as a practical currency for everyday purchases. This grant will enable us to build a secure, scalable platform that benefits the entire Sandbox ecosystem.
