Quote from: Bitman911 on June 16, 2017, 10:41:16 PM

I sold 7.61314167 BAT @ 0.00009494 BTC = 0.00072279 BTC
Then .25% commision (0.00000181 BTC)
Therefore total price would be 0.00072279+0.00000181 = 0.00072460 BTC

But Bittres says cost/proceeds is 0.00072106 (so it's 0.00000354 out!)

I suspect you posted the order at 0.00009494 but it got filled at a (better) 0.00009495 price because there was a bid for that price on the order book (somebody was willing to buy your coins for more than what you asked for).

The commission is always deducted from the currency you acquire: 7.61314167 * 0.00009495 * (1 - 0.0025) = 0.00072106063, which is exactly 0.00072106 when truncated to 8 decimals (which it seems is how they get rid of the extra decimals).

Reference: https://support.bittrex.com/hc/en-us/articles/115000199651

Quote from: Bitman911 on June 16, 2017, 10:41:16 PM

I bought them for no more than a week 7.61314167 BAT @ 0.00009000 BTC = 0.00068518 BTC
Then .25% commision (0.00000171 BTC)
Therefore total price would be 0.00068518 + 0.00000171 = 0.00068690

But bittrex says cost/proceeds is -0.00068689 (so 1 statoshi out)

If you received 7.61314167 BAT after the fees paid, you must've received 7.61314167 / (1 - 0.0025) = 7.632222226 before fees, and 7.63222222 * 0.00009000 = 0.0006868999998, which checks out.

Would I be Bittrex, I always rounded fees up to the nearest satoshi (or its altcoin equivalent), but it seems they figured let's just truncate the numbers.