Stablecoin-Denominated Pools

The invariant used by stable-asset exchanges concentrates liquidity around parity. Trades near the peg move price very little and earn the pool a fee; a large imbalance pushes price away from parity quickly. The pool’s balance between its two assets is therefore a live signal. A pool that is filling up with one side is the market telling you that it is selling that side.

The desk monitors the composition of every pool it is in. A pool that stays balanced is earning fees from ordinary flow. A pool that skews persistently toward one asset is being used as the exit for that asset, and its fee income is the price it is being paid to absorb the selling. Positions are exited on a rule when a pool’s composition leaves its band, which happens before the pool’s price does.

Not every dollar is the same dollar. Fiat-backed stablecoins from regulated issuers with published attestations sit in one tier; overcollateralized crypto-backed stablecoins in another; synthetic dollars backed by a derivatives hedge in a third. A pool is assessed on its weaker side, and the size the desk will hold in a pool is set by the tier of that side, never by the pool’s fee rate.

Pools that pair a plain stablecoin against a yield-bearing one, such as a tokenized Treasury instrument or a staked synthetic dollar, drift by design as the yield-bearing side accrues. Newer pool designs account for that accrual so that providers are not arbitraged out of the yield. The desk uses these pools where the design handles the drift and avoids them where it does not.

Stable pools are among the most heavily incentivized in decentralized finance because every protocol needs deep stablecoin liquidity. As everywhere else in the book, emissions are accounted for separately, realized on a schedule and excluded from the base case. A stable pool is held for its fee income and its liquidity. Incentives are welcome and are not the reason for the position.