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Fees are charged whenever an account's position changes. There are three fees that may be charged depending on what the position update is doing.
The settlement fee is charged anytime the position changes – this is a fixed amount set by the settlementFee parameter and is used to cover the oracle keeper fee.
Charged when a long or short position is opened or closed – there are three components to the taker fee:
- Notional size of the order,
- Change in skew that it causes the market
- Impact that it causes the market.
The change in skew is defined as
, and is meant to measure the size of the order relative to the market.
The impact is defined as
, and is meant to measure how much the order hurt or helped the overall skew of the market.
Similarly, the maker fee is charged when a maker position is opened or closed – There are two components to the maker fee:
- Notional size of the order
- Change in utilization that it causes the market.
The change in utilization is defined as
utilization’ - utilization, and is meant to measure how much the order hurt or helped the overall utilization of the market.
All collected fees are split between the Makers (and in rare cases takers), Perennial treasury, and the respective Product owner's treasury.
This allows market owners (whether individual organization or DAOs / protocols) to collect revenue directly from the administration of the Products and their parameters.