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Market Making

Pick a mode to begin.

First time? Read the 4-minute Stoikov primer — how to think about bid/ask under inventory risk. →
What you'll do
  • See a real market quantity (TSLA earnings, Manhattan home median, etc.)
  • Quote an interval you're 80% confident contains the true value
  • Aim to be calibrated, not narrow — a wide right answer beats a tight wrong one
Why this matters
  • Prop traders quote bids and asks under inventory risk all day. Calibration is the skill.
  • You'll see one quantity per round and learn the actual answer immediately
  • 10 rounds, ~6 minutes. Stats and feedback at the end.

Result

True value
Your interval
Calibration score

Session complete

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