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I have a calculator for calculating trade fees for Bitcoin on exchanges (http://tradeli.st)

However I get asked a lot to add "shorting".

Basically, for a "long" position. I do this:

BUY 1 BTC @ $100 USD
SELL .996 BTC @ $200 USD //buy fee is subtraced from sell amount

Then I take another .6% out of the sell trade to get total fees (1.2%). This all works fine and well.

But for shorting, (i'm not familiar with fee calculating on a short). The order is reversed:

SELL 1 BTC @ $200 USD //this is what user will enter to start
BUY ? BTC @ $100 USD

The user enters "SELL 1 BTC @ $200". How should I be subtracting the fees on a short?

  • try /r/bitcoinmarkets -- they will know. – chovy Nov 7 '15 at 19:06

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