Accounting and Settlement
Within Drift Protocol, all token deposits are held in a global collateral vault. This is required for seamless cross-margin and borrow-lend. The only exception to this is the insurance fund vault residing outside.
Ensuring proper accounting across users requires a robust settlement mechanism. The protocol uses intermediate Pool Balances to facilitate transfers and ensure that claimed gains are required to come from settled offsetting losses.
Perpetual Market
An individual perpetual market has two pools:
A. P&L Pool: to accumulate funds from users with losses for settlement to users with profits B. Fee Pool: to accumulate a fraction of exchange fees for the Quote Spot Market's Revenue Pool
The P&L Pool receives the highest priority on claimed funds, in order to give user's the best possible experience. The default fraction of exchange fees for the Fee Pool is total_exchange_fee / 2 and this fraction is determined by: SHARE_OF_FEES_ALLOCATED_TO_CLEARING_HOUSE.
The Fee Pool will only get partially filled up by up to 1% of intermediate P&L settled from a user's losses and aggressively drawn down for the benefit of the P&L Pool otherwise.
Spot Market
An individual spot market has two pools:
A. Revenue Pool: to accumulate revenue across the protocol, denominated in this token B. Fee Pool: to pay fillers and settle portions to the revenue pool
The Revenue Pool can collect fees from:
- Borrow interest
- Liquidations
- Perpetual Markets
and can pay out to
- Insurance Fund Stakers
- Perpetual Markets
(see details of these rules in ๏ปฟRevenue Pool)
The Fee Pool collects exchange fees from swaps and uses them to pay out the Keeper Network ๏ปฟKeepers & Decentralised Orderbook๏ปฟ
Future Work
Currently, a Perpetuals Market can only pull from the Spot Market Revenue Pool and Insurance Fund for its quote currency.
- In the future, it may be possible for a distressed associative perp market (BTC-PERP) to be able to pull funds from the associated spot market (BTC) revenue/insurance pool and immediately swap for USDC to top off its fee/P&L pool.
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