> For the complete documentation index, see [llms.txt](https://surf-2.gitbook.io/surfliquid-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://surf-2.gitbook.io/surfliquid-docs/vaults/lending-vaults.md). # Lending Vaults **Market-neutral vaults for automated on-chain yield**
Lending Vaults are Surf’s primary savings product for stable, risk-aware yield. They are designed to behave like automated on-chain savings vaults, not speculative trading systems. Their goal is simple: > Maximise sustainable, risk-adjusted yield while preserving liquidity, safety, and withdrawal flexibility at all times. *** #### What Lending Vaults Optimise For Lending Vaults are built around four primary objectives: 1. **Capital Preservation First** Yield is secondary to safety. No vault is allowed to increase liquidation risk, protocol concentration, or exit fragility in order to chase headline APY. 2. **Net Yield, Not Nominal Yield** Lending Vaults optimise for: * APY after fees * After slippage * After gas * After incentive decay * After withdrawal and unwind costs 3. **Liquidity and Exit Readiness** Funds must always be positioned where: * Withdrawals can be processed quickly * Liquidity is deep * Market stress does not trap capital 4. **Deterministic Risk Boundaries** Every allocation is constrained by: * Exposure caps * Venue risk scores * Correlation limits * Health factor buffers * Stress scenario tolerance *** #### How Lending Vaults Think About Yield Lending Vaults do not treat yield as a single number. Yield is modelled as a dynamic system influenced by: * Utilisation curves * Borrow demand * Incentive emissions and cliffs * Liquidity depth * Volatility regimes * Correlated liquidation risk * Protocol upgrade and governance risk * Oracle and price feed integrity Each venue is continuously scored on: * Base rate sustainability * Incentive stability * Liquidity resilience * Historical stress behaviour * Smart contract and governance risk *** #### Vault Universe Lending Vaults operate across: * Lending markets * Borrowing markets where risk-adjusted * Cross-chain stablecoin venues * Approved yield sources Only allowlisted, audited, and monitored protocols are considered. **Each protocol is placed into a risk tier with strict allocation ceilings.** *** #### Allocation Logic At any moment, Lending Vaults determine: * How much capital to allocate * To which venues * In which asset combinations * With what buffer to liquidation * With what withdrawal latency tolerance The vault explicitly avoids: * Single-venue concentration * Incentive cliff exposure * Thin liquidity pools * Reflexive loops that amplify liquidation cascades *** #### Rebalancing Philosophy Lending Vaults do not rebalance continuously. Rebalancing is triggered only when: * Risk-adjusted return improves materially * Liquidity and exit safety remain strong * Execution cost is justified * Guardian constraints are fully satisfied Small APY differences are ignored. **Stability and continuity are prioritised.** *** #### Stress and Downside Handling Lending Vaults continuously simulate: * Rate collapses * Liquidity drains * Oracle deviations * Borrow utilisation spikes * Incentive exhaustion * Cross-asset correlation shocks When risk rises: * Exposure is reduced * Liquidity buffers are increased * Allocation is shifted toward more resilient venues * Rebalancing frequency is throttled *** #### Why Lending Vaults Are Different Most yield systems optimise a spreadsheet. Lending Vaults operate inside a live, adversarial system. It combines: * AI-run opportunity scanning * Deterministic risk constraints * Continuous stress simulation * Non-custodial execution * User-owned vault isolation * Guardian-enforced safety rules The result is not “maximum APY at any cost”. It is: > Sustainable, compounding yield that can be trusted with long-term savings. This is why Lending Vaults behave like programmable savings products, not farming bots.