Senior Tranche Vault
XLP-S is a closed, system-owned vault.
Role in the System
XLP-S aggregates:
protocol insurance funds,
collateral backing Locked Yield positions,
and idle / free collateral from user accounts that is approved for liquidity provision.
It cannot be accessed directly by users and does not function as a retail yield product.
This capital is continuously deployed to:
provide liquidity to protocol markets,
internalize flow,
earn LP fees and spreads,
and improve effective lending and borrowing rates across the Fixed Yield layer.
Economic Purpose
XLP-S exists to make user collateral productive.
Instead of leaving excess collateral idle:
it is routed through XLP-S,
earns conservative liquidity yield,
and that yield is rebated into better Fixed Yield pricing for lenders and borrowers.
As a result:
XLP-S headline yield is intentionally low and smoothed,
because value is transferred outward to users via improved APRs.
Yield Model
XLP-S yield is tracked as a 14-day EWMA (exponentially weighted moving average) of realized returns.
This EWMA defines the sustainable yield level that XLP-S can afford without destabilizing the system.
The window can be changed by executor of the vault with timelock and alert.
When Realized Yield > EWMA
Excess yield (above EWMA) is split as follows:
XLP-S Reserve (priority)
Executor fee
Protocol fee
Reserve mechanics:
No hard cap on reserve size
Growth is unlimited
As the reserve becomes larger, its priority share gradually decreases, slowing further accumulation but never stopping it
This ensures:
rapid reserve build-up early,
long-term system sustainability.
When Realized Yield < EWMA
If realized yield falls below the EWMA level:
the difference is compensated from the XLP-S Reserve
Fixed Yield pricing remains stable
Lenders and borrowers are shielded from short-term regime shifts
This makes XLP-S a rate stabilizer, not a profit-maximizing vault.
Risk & Behavior Profile
Closed vault (no direct deposits or withdrawals)
Conservative deployment
Low volatility
Primary function is rate smoothing and insurance
Acts as:
liquidity provider,
spread internalizer,
yield stabilizer,
and first-line defense before any broader risk absorption
System-Level Impact
XLP-S enables:
higher Fixed Deposit APRs,
lower Fixed Borrow rates,
better capital efficiency for Locked Yield users,
and reduced reliance on external liquidity during stress.
It converts unused collateral into protocol-owned liquidity without increasing user liquidation risk.
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