How to tweak formula behaviour

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:

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


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

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