What is simulated and what is not
The book is real. Prices, depth and the trades going through are the live market. Only your orders are imaginary. Fills, fees and P&L behave exactly as they do live:- A resting order fills when the market reaches it, not before.
- A crossing order pays the venue’s taker fee, at the same rate.
- The P&L is calculated the same way, from the same numbers.
Paper books are per account. Every account you connect starts with its own
$1,000, and you can reset it in Settings whenever the experiment is over.