Trading Fees

Juhus Market · Fee Model

Transparent by formula.

Every trade on Juhus Market is charged a fee derived from a single formula. No hidden multipliers, no surprise rebates — just probability, size, and volume.

The formula
fee=α·C·P·(1 − P)·(1.4−0.1·⌊log₁₀(V)⌋)

Valid for V ≥ 1. At V < 1, the multiplier is clamped to 1.4.

Parameters

What each symbol means

Six values drive every fee calculation. Two are market state, three come from the trade itself, and one is a policy lever.

α

Base rate

Adjustable fee lever applied uniformly. Example: 0.07 corresponds to a 7% ceiling before the probability and volume factors scale it down.

C

Shares purchased

Number of contracts bought in the transaction. The fee scales linearly with size.

P

Implied probability

Market probability of the outcome, expressed between 0 and 1.

P·(1−P)

Variance term

Peaks at 0.25 when P = 0.5 and approaches zero near certainty, so fees shrink as outcomes become lopsided.

V

Cumulative volume

Total trading volume on the market so far. Liquid markets pay less.

⌊log₁₀(V)⌋

Volume decade

Floor of the base-10 logarithm of volume. Groups volume into decades without any interpolation.

Volume brackets

How volume discounts the fee

Each power of 10 in cumulative volume knocks 0.1 off the multiplier. The bar shows how aggressively the discount compounds in liquid markets.

  • < 10
    0
    1.4
    2.450%
  • 10 – 99
    1
    1.3
    2.275%
  • 100 – 999
    2
    1.2
    2.100%
  • 1,000 – 9,999
    3
    1.1
    1.925%
  • 10,000 – 99,999
    4
    1.0
    1.750%
  • 100,000 – 999,999
    5
    0.9
    1.575%
  • 1,000,000+
    6
    0.8
    1.400%
Notes

Details worth knowing

A few properties of the formula that affect how it behaves in practice.

1

P·(1−P) is the variance term — it peaks at P = 0.5 and approaches zero as outcomes approach certainty, so lopsided trades are charged proportionally less.

2

The floor function keeps the multiplier flat within each bracket. There is no interpolation between decades — a trade at V = 99 pays the same multiplier as a trade at V = 11.

3

α scales every fee proportionally. Changing α shifts the whole curve up or down without altering its shape.

4

The formula extends indefinitely. Each additional power of 10 in cumulative volume reduces the multiplier by another 0.1.