Order entry
Place a limit (rests on the book) or market (takes existing depth) order. You can't sell shares you don't hold — buy the opposite side instead.
Depth ladder — YES
Asks (red) are sell offers; bids (green) are buy offers. Bars show cumulative depth. Highlighted rows are the bot's resting quotes.
Fair value
The bot centers its quotes here. Drag to watch it re-center. "Track mid" instead follows the book midpoint (and goes blank on a thin book).
Bot (market maker)
The real MM engine, stepped one tick at a time. It quotes both sides, skews size toward reducing inventory, and gates asks on shares it holds.
Participants — position & P&L
Net P&L is a mark-to-mid teaching approximation (cash moved + shares × mark), not the fee-inclusive markout the backtest path computes.
Mid-price history
The YES book midpoint over the ticks you've stepped.
Trade blotter
One row per trade (the taker's side), most recent last.