# Pre-launch perps

The prelaunch funding model differs from regular products in how the index is provided. Rather than an oracle, it is computed. The other parts of the model are the same apart from the following constant values.

* `FundingInterval` set to `24` hours
* `Clamp` set to `0.005 = 0.5%`
* `BaseRate` set to `0.00025 = 0.025%`

**Prelaunch index**

* `Index = ema(FundingMarks, PrelaunchWeight)`
  * computed every `TickInterval`
  * `ema` is exponential moving average
    * `PrelaunchWeight` is the EMA weighting
      * set to `2 / 2881`
    * `FundingMarks` is list of previous `FundingMark` every `TickInterval`