#DeFi (Decentralized Finance)

DeFi (Decentralized Finance) refers to blockchain-based financial services operating without banks or intermediaries. The movement exploded in “DeFi Summer” 2020, reaching $180 billion Total Value Locked before crashing alongside crypto markets in 2022.

Core Concepts

DeFi enables:

• Lending/Borrowing - Earn interest or borrow without credit checks (Compound, Aave)
• Decentralized Exchanges - Trade tokens peer-to-peer (Uniswap, SushiSwap, Curve)
• Stablecoins - Dollar-pegged tokens (USDC, DAI, Tether)
• Yield Farming - Earning tokens for providing liquidity
• Liquidity Mining - Earning governance tokens
• Flash Loans - Uncollateralized loans within single transaction
• Automated Market Makers (AMMs) - Algorithmic token pricing

DeFi Summer 2020

June-October 2020 saw explosive growth driven by:

• Compound (COMP token launch June 15) - Sparked liquidity mining trend
• Yearn Finance (YFI) - Andre Cronje’s fair-launch yield optimizer
• Uniswap (UNI airdrop Sept 16) - $6K+ to every past user
• Food Coins - SushiSwap, Pancake, Yam, Hot Dog - ridiculous token names

“Ape into DeFi” culture: depositing funds into unaudited smart contracts for 1,000%+ APYs.

Total Value Locked surged from $1B (May 2020) to $15B (Oct 2020).

The 2021 Peak

DeFi TVL peaked at $180 billion (November 2021) across:

• Ethereum DeFi: Maker ($18B), Curve ($20B), Aave ($13B)
• Alternative chains: BSC (PancakeSwap), Avalanche, Solana, Polygon

100,000%+ APYs promised by newer protocols, often via inflationary token emissions.

Exploits & Failures

Smart Contract Hacks (2020-2022):

• Poly Network: $600M stolen, $600M returned (Aug 2021)
• Ronin Bridge: $625M stolen (March 2022)
• Wormhole: $325M stolen (Feb 2022)
• Dozens of smaller hacks ($10-100M each)

Ponzi Collapses:

• Terra/Luna (May 2022): $40B stablecoin algorithmic Ponzi implosion
• Celsius (July 2022): Lender halted withdrawals, filed bankruptcy
• Voyager, BlockFi, FTX: Centralized lenders masquerading as DeFi

Rug Pulls: Developers abandoning projects, taking liquidity

The Reality Check

By 2023, DeFi TVL fell to $40 billion (78% decline from peak). Lessons learned:

• High APYs = unsustainable token inflation
• “Code is law” means hacks are permanent
• Anonymity enables scams
• Financial primitives (lending/DEXs) survived, but yield farming died

DeFi believers argue the infrastructure remains revolutionary; critics call it unregulated casino enabling financial crime.

Sources:

• DeFi Llama TVL historical data
• Rekt.news hack database
• “The Infinite Machine” (Camila Russo, 2020)
• FT, Bloomberg DeFi coverage