DeFi Architecture Overview
Decentralized Finance (DeFi) platforms replace traditional financial intermediaries with smart contracts. Core components: Smart Contracts (business logic), Frontend (web3 UI), Oracle (price feeds), Liquidity Pools (AMM), and Governance Token. Each component must be designed for security and gas efficiency.
Liquidity Pool Implementation
Automated Market Makers (AMMs) like Uniswap use the constant product formula (x*y=k) for pricing. Implement liquidity provider (LP) tokens to track pool shares, fee distribution (typically 0.3% per trade), and impermanent loss calculations. Fork Uniswap V2/V3 contracts as a starting point.
Smart Contract Security
DeFi smart contracts have lost over $3 billion to hacks. Critical security practices: get a professional audit (Certik, Hacken, or Trail of Bits), implement reentrancy guards, use OpenZeppelin's security library, set up a bug bounty program, and use time-locks for critical admin functions.
Oracle Integration
DeFi platforms need reliable price feeds for asset valuation. Chainlink is the industry standard — use their decentralized oracle network for ETH, BTC, and 100+ other assets. Never use on-chain DEX prices as oracles — they are manipulable via flash loan attacks.
Regulatory Considerations for India
DeFi in India is in a regulatory gray area. RBI has expressed concerns about crypto, but there is no outright ban on development. Include KYC for fiat on/off ramps, implement transaction monitoring for AML compliance, and consult a crypto-specialized legal advisor before launch.
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