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Fat-Finger Guard

Catches wrong quantity or off-market limit prices

Traders frequently report costly order entry mistakes (wrong limit price, wrong size), especially while rushed. This recipe blocks orders that look like outliers relative to current price and usual size.

House RecipePersonal6 min setup

INGREDIENTS

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PROMPT

Create "Fat-Finger Guard". Before any order submit, check: (1) qty <= 2x my recent average size and (2) limit price within 0.5% of last price. If violated, block and require explicit confirmation, offering a safe-mode order at 50% size + bracket.

Pain point

A single bad ticket can erase weeks of steady progress.

Triggers

  • Any order submission

Conditions

  • Detect if order size > maxSizeMultiplier * recentAvgSize
  • Detect if limit price deviates > maxPriceDeviationPercent from last price

Actions

  • Require double-confirmation with a clear warning
  • Offer "safe mode" template (smaller size + bracket)
  • Log: "order-entry error prevented" stats

Parameters (defaults)

  • maxSizeMultiplier: 2.0
  • maxPriceDeviationPercent: 0.5
  • safeModeSizeMultiplier: 0.5

Examples

  • If you try to buy 3x your usual size, block and require explicit confirm.
  • If your limit is 1% away from last price, warn and prompt correction.
Tags:#trading#execution#safety#risk-management