Onchain Lending Revolutionizes Credit with Overcollateralization

Onchain lending has disrupted traditional credit systems by replacing credit scores with overcollateralization. Protocols running on public blockchains lend users thousands of dollars in minutes without requiring an application, credit bureau inquiry, or human intervention.

The system works by having users deposit crypto worth more than what they borrow, and a smart contract holds it as security. If the collateral value drops below a threshold, an automated liquidation mechanism sells part of it to repay the loan, protecting lenders from losses.

Protocols like Aave, Compound, and emerging players like Zest Protocol on Bitcoin (BTC) have extended this model across multiple chains, with total value locked across DeFi lending exceeding $40 billion as of mid-2026. The system is driven by real-time price data fed into lending protocols through oracle networks, primarily Chainlink.

Liquidation is the enforcement mechanism that makes the whole system work. When a position's health factor falls below 1.0, it becomes available for external actors called liquidators to close. Liquidators are typically bots run by traders or protocol-affiliated entities that monitor the blockchain for at-risk positions and submit transactions to repay part of the borrower's debt in exchange for a portion of the collateral at a discount.

DeFi lending protocols do not have a rate-setting committee, instead using an algorithmic model based on the utilization rate. If a USDC lending pool has $100 million deposited and $60 million borrowed out, utilization is 60%. Protocols model interest rates on a curve that rises slowly at first and then sharply accelerates as utilization approaches 100%.