Echelon is a decentralized, non-custodial lending protocol purpose-built with the Move programming language. Currently deployed on Aptos, Movement, and Initia, it serves as the core capital coordination layer for Move-based DeFi, enabling users to supply assets to earn yield and borrow against collateral through overcollateralized loans. The protocol offers several core products. The primary lending markets feature variable-rate borrowing with vault-based accounting where depositors passively accrue interest from borrowers. Efficiency Mode (E-Mode), inspired by Aave, enables higher loan-to-value ratios of up to 90% on correlated asset pairs such as stablecoins or liquid staking tokens. Isolated pools provide risk-segregated markets for long-tail assets, preventing contagion to core liquidity. The Fixed Yield product allows users to tokenize, trade, and leverage yield-bearing assets without liquidation risk on the yield component. The protocol employs a multi-layered risk architecture including supply and borrow caps per asset, conservative LTV and liquidation thresholds, rate limits on deposits and withdrawals, and an automated liquidation mechanism. Oracle infrastructure is powered by Chainlink as the primary source with Pyth and Switchboard as fallbacks, ensuring tamper-resistant pricing for fair liquidations.