Stop-Loss Order

In simple terms

A stop-loss order is like setting an alarm that automatically sells your investment if it drops to a certain price. It's a safety net that protects you from losing more money than you're willing to accept.

Definition

Automatically closes a position at a preset loss level to limit downside.

In depth

A stop-loss order is a conditional instruction submitted to an exchange that automatically triggers a market or limit sell order when an asset's price falls to a predetermined threshold. Upon breach of this trigger price, the order executes immediately without requiring manual intervention, though execution price may vary depending on market liquidity and whether a limit price is specified. This mechanism is essential for risk management in volatile crypto markets, as it ensures positions are liquidated at acceptable loss levels even when traders are unavailable to respond to price movements.

How does Stop-Loss Order work?

You set a trigger price below your entry (for a long position). The exchange watches the market price and leaves the order dormant until the market trades at or through that trigger. Once triggered, the stop converts into a market order and fills at whatever prices are available in the order book at that moment. Because it becomes a market order, the fill price is not guaranteed — in a fast or thin market it can be meaningfully worse than the trigger. The order sits on the exchange, so it works whether or not you are watching.

An example

Illustrative figures only. Someone holds 1 unit of a coin bought at $100 and places a stop-loss with a $90 trigger. The price drifts down and trades at $90, which triggers the order. It becomes a market order and fills at $89.60 because the order book was thin. The realised loss is $10.40 per unit, not the $10 the trigger implied. That gap is called slippage.

Figures are illustrative only.

What beginners get wrong

• Setting the trigger only a fraction below entry means routine volatility closes the position before the original idea has time to play out.
• A stop-loss caps losses under normal conditions but does not guarantee a price — a gap or thin book can fill it far below the trigger.
• Many traders forget the stop is still live after they sell manually, leaving an orphaned order that can execute unexpectedly later.
• Placing a stop at an obvious round number puts it in a crowded zone where many orders trigger at once, worsening the fill.

Related terms

• Take-Profit Order
• Stop-Limit Order
• Trailing Stop
• OCO (One Cancels the Other)
• Liquidation
• Risk Tolerance

Part of

What do the different crypto order types do? — the subject page for order types, with all 9 of its definitions in one place.