Feature Request: Support decimal percentages for fee rates

[21Mill]

Currently, the platform only allows setting trade fees using whole integer percentages (1%, 2%, 3%, etc.). It does not support decimal or fractional percentages (such as 1.5% or 2.2%). This limits the flexibility to establish more precise or competitive fee structures.

Expected Behavior:
The Mostro daemon should allow the configuration and processing of fee rates that include decimal points.

Being able to set a fee like 0.5% or 1.5% is standard across most exchanges and P2P platforms. Restricting this to whole numbers forces the fees to be either 0% or jump directly to 1% and 2%, removing the possibility of micro-fees or more granular adjustments.

[arkanoider]

I'm not sure about this, order fee is splitted between buyer/seller and calculated like:

pub fn get_fee(amount: i64) -> i64 {
    let mostro_settings = Settings::get_mostro();
    // We calculate the bot fee
    let split_fee = (mostro_settings.fee * amount as f64) / 2.0;
    split_fee.round() as i64
}

so you can put any kind of fee value in settings.toml, the fee amount calculated is rounded at the end to have a finite amount of sats. Maybe I did not understood exactly your concern-

[21Mill]

I'm not sure about this, order fee is splitted between buyer/seller and calculated like:

pub fn get_fee(amount: i64) -> i64 {
    let mostro_settings = Settings::get_mostro();
    // We calculate the bot fee
    let split_fee = (mostro_settings.fee * amount as f64) / 2.0;
    split_fee.round() as i64
}

so you can put any kind of fee value in settings.toml, the fee amount calculated is rounded at the end to have a finite amount of sats. Maybe I did not understood exactly your concern-

I was referring to the premium percentages, sorry, my fault.

[arkanoider]

Yep! That makes sense indeed, I will take a look to it, should be quite easy.