Modern Frontier · v2
Fluid
Unified liquidity layer — one pool of capital serving lending, vaults and DEX at once.
TradFi →Prime brokerage cross-margining
Prerequisites
01 · Concept — what problem does it solve?
DeFi fragments capital: the same USDC sits idle separately in a lending pool, a DEX pool, and a vault. Fluid builds one shared liquidity layer that every product (lending, vaults, DEX) draws from — so a single unit of capital can simultaneously earn lending yield, back a borrow position, and provide swap liquidity. "Smart collateral" earns trading fees; "smart debt" gets cheaper as traders swap through it.
02 · Mechanics
- Liquidity layer: single contract holding all assets; protocols on top get allowances and ceilings, not separate pools.
- Smart collateral: vault collateral doubles as DEX liquidity — borrowers earn fees that offset borrow rates.
- Smart debt: debt positions double as swap liquidity on the debt side; swap fees reduce effective borrow APR.
- engine: liquidates in aggregated tranches against the DEX itself — up to ~95% with penalties as low as ~0.1%.
03 · Formulas
// capital efficiency vs isolated pools
eff = Σ utilizationsᵢ of one $ across i functions
isolated: $1 → 1 job; Fluid: $1 → 2–3 jobs
// effective borrow rate with smart debt
r_eff = r_borrow − feeAPR_swaps_through_debt
// vault safety
LTV ≤ ~95% · penalty ≥ ~0.1% (range-based liq.)
04 · Edge cases & risks
- Risk propagation — one shared layer means one shared failure domain; a bug or bad-debt event in any product can stress every product. Full treatment in Multi-Utilization Liquidity Layers.
- spikes — multiple products competing for the same exit liquidity can gate withdrawals under stress (ceilings mitigate).
- Liquidation dependency — liquidations route through the in-house DEX; its depth in a crash is the binding constraint.
Connected concepts