invoice.md

ChainVoice: Invoice Financing Platform - MVP Spec

Problem & Solution

Problem: SMBs wait 30-90 days for invoice payments, creating cash flow gaps.

Solution: Upload invoice → AI scores credit → Oracle verifies → Get cash in minutes. Investors earn 10-15% APY from real business payments.

Market: $3+ trillion in unpaid invoices globally.

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Core Features (MVP Only)

For Businesses

1. Upload invoice (PDF)
2. Get instant credit score
3. Receive 90-95% of invoice value immediately
4. Pay back when customer pays invoice

For Investors

1. Deposit USDT/USDC into liquidity pool
2. Earn 10-15% APY automatically
3. Withdraw anytime (if liquidity available)

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Technical Architecture

Business → Upload Invoice → AI Score → Oracle Verify → Mint NFT → Pool Funds Business
Customer Pays → Settlement Contract → Distribute to Investors + Fees

Smart Contracts (3 Core)

1. InvoiceNFT.sol

• Mint invoice as ERC-721 NFT
• Metadata: amount, debtor, due date, status
• Status: PENDING → FUNDED → PAID

2. LiquidityPool.sol

• Single pool (ERC-4626)
• Deposit USDT/USDC
• Auto-fund verified invoices
• Distribute payments to LPs

3. PaymentSettlement.sol

• Accept payments from debtors
• Auto-distribute: 90% to investors, 10% fees
• Handle partial payments

Off-Chain Services

AI Credit Scoring (Simple)

• Rule-based model:
  • Business age > 6 months: +20 points
  • No defaults: +30 points
  • Invoice < $10k: +20 points
  • Payment term < 60 days: +20 points
• Score > 70 = approved

Invoice Oracle (Basic)

• Verify invoice is valid PDF
• Check basic fields (amount, date, debtor)
• Anti-duplicate check
• Return: APPROVED/REJECTED

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MVP Scope (What We Build)

Must Have

• ✅ 3 smart contracts (InvoiceNFT, Pool, Settlement)
• ✅ Business dashboard: upload invoice, get funded
• ✅ Investor dashboard: deposit, view earnings
• ✅ Simple AI credit scoring (rule-based)
• ✅ Basic oracle verification
• ✅ Payment flow (simulate customer payment)
• ✅ Mantle testnet deployment

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User Flow (Simplified)

Business:

1. Connect wallet
2. Upload invoice PDF
3. Wait 30 seconds (AI + oracle check)
4. Receive 95% of invoice value in USDT
5. Repay when customer pays

Investor:

1. Connect wallet
2. Deposit USDT into pool
3. Earn yield automatically
4. Withdraw anytime

Example:

• Invoice: $10,000, 30 days
• Business receives: $9,500 (5% discount)
• Investor earns: $500 / $9,500 × (365/30) = 64% APY
• Protocol fee: 20% of profit = $100