🔧Technical Stack
LendFriend is built on modern web3 infrastructure, prioritizing low costs, transparency, and ease of use.
Blockchain
Base L2 (Ethereum)
All loans live on Base - an Ethereum Layer 2 blockchain backed by Coinbase.
Why Base?
$0.01 transactions - Lending $100 costs a penny, not $50
2-second confirmations - Fast enough to feel instant
Ethereum security - Inherits Ethereum's battle-tested security
Growing ecosystem - 20M+ active addresses, USDC native support
Network details:
Mainnet: Chain ID 8453
Explorer: basescan.org
Data Layer
The Graph (Blockchain Indexing)
Reading blockchain data directly is slow and expensive. The Graph indexes all loan events in real-time for instant queries.
What we index:
All loans (amount, status, maturity date)
All contributions (who funded what)
All repayments (timing, amounts)
Complete repayment history per borrower
This creates a permanent, queryable credit history visible to all future lenders.
IPFS (Metadata Storage)
IPFS stores loan details too expensive to put on-chain (images, descriptions, budget breakdowns).
Why IPFS?
Decentralized (no single point of failure)
Immutable (can't edit loan terms after creation)
Permanent (content addressed storage)
Cost-effective
Each loan has an IPFS link stored on-chain. Once uploaded, metadata cannot be changed - ensuring transparency and preventing fraud.
Frontend
Built with:
Next.js 14 (modern React framework)
Privy (embedded wallets + social login)
Wagmi/Viem (Ethereum interactions)
Tailwind CSS (clean, responsive design)
Supports:
MetaMask, Coinbase Wallet, WalletConnect
Email/SMS embedded wallets (no crypto needed)
Mobile passkeys
Infrastructure
Hosting:
Vercel (frontend)
Redis Cloud (caching)
Neynar API (Farcaster data)
Pinata (IPFS pinning)
Cost: $20-70/month for MVP
Security
Smart contracts:
OpenZeppelin standards
Reentrancy guards
Access control
Input validation
API:
Rate limiting
Server-side API keys
Input validation
Audits:
Internal review complete
External audit planned (Q2 2025)
Bug bounty: Up to $10,000 for critical vulnerabilities 📧 [email protected]
Open Source
All code is MIT licensed:
Next: Smart Contract Flow · Social Trust Scoring · Risk & Default Handling
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