Algebra Integral
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        • How to set up specific formula behaviour
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  1. Algebra V1 / Technical Reference
  2. Contracts
  3. Adaptive Fee

How to tweak formula behaviour

PreviousHow to set up specific formula behaviourNextContracts Setup

Last updated 11 months ago

Sigmoid coefficients Fee calculation can be tuned by the following parameters:

  struct Configuration {
    uint16 alpha1; // max value of the first sigmoid
    uint16 alpha2; // max value of the second sigmoid
    uint32 beta1; // shift along the x-axis for the first sigmoid
    uint32 beta2; // shift along the x-axis for the second sigmoid
    uint16 gamma1; // horizontal stretch factor for the first sigmoid
    uint16 gamma2; // horizontal stretch factor for the second sigmoid
    uint32 ; // shift along the x-axis for the outer volume-sigmoid
    uint16 ; // horizontal stretch factor the outer volume-sigmoid
    uint16 baseFee; // minimum possible fee
  }

Adaptive fee function is a combination of several sigmoids. The plot of the standard sigmoid function looks like this:

Adaptive fee sigmoid

We use a more flexible formula for sigmoids:

So additional params (alpha, gamma, beta) allow us to shift, stretch and modify sigmoids.

Default params:

      2900, // alpha1
      12000, // alpha2
      360, // beta1
      60000, // beta2
      59, // gamma1
      8500, // gamma2
      0, // 
      10, // 
      100 // baseFee

So

max fee value is: baseFee + alpha1 + alpha2 min fee value is: baseFee

midpoint of the first sigmoid: beta1 midpoint of the second sigmoid: beta2

sigmoid β€œjump” β€œstarts” around beta - 6 * gamma, ends around beta + 6 * gamma

alpha1, alpha2, beta1, beta2, gamma1, gamma2 – coefficients for volatility sigmoids. – coefficients for volume sigmoid

Flexible formula
Different options
Sigmoid jumps
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