What Is a Stop-Loss? Definition, Example and Where to Place It

By Gurjeet Singh, developer of CoinPriceAlert · Published 31 August 2026 · 5 min read

The definition

A stop-loss is an order that closes a position once price passes a level you chose.

Definitions in crypto are often circular or full of jargon. If you understand only that sentence, you already know more than most people using the term.

Why it matters to you

In practice, it caps a loss without requiring you to be present and rational at the worst moment.

The concepts that affect your decisions are worth understanding properly; the rest is trivia.

The part people get wrong

One important nuance: stops placed at obvious round numbers are frequently swept.

Most costly mistakes in crypto come from a half-understood concept rather than a completely unknown one.

How a stop-loss actually executes

A stop-loss is two decisions in one order: a trigger price, and what happens when it trades. A stop-market order sends a market sell the moment the trigger prints, so it always exits and rarely at exactly the trigger price. A stop-limit order sends a limit sell instead, so it exits at your limit or better, and may not exit at all if price falls through the limit without trading there.

Example: you hold ETH bought at $3,400 and set a stop at $3,200. With a stop-market, a fast drop to $3,150 fills you somewhere between $3,180 and $3,150 depending on the book. With a stop-limit at a $3,200 trigger and a $3,190 limit, the same drop can leave you holding ETH at $3,150 with an unfilled order, because nobody bought at $3,190 on the way down.

Derivatives venues add one more variable: the trigger can watch the last traded price or the mark price. Mark price is a smoothed fair value that is harder to move with one large order, which is why most perpetual traders trigger their stops on it.

Where to place it: structure and volatility, not round numbers

The common mistake is placing the stop a fixed percentage below entry, 5% or 10%, because it feels tidy. The market does not know your entry price. It does know where the last swing low is and how far the asset moves on a normal day, and a stop that sits inside either of those gets hit by noise.

Two better anchors. First, structure: put the stop beyond the level that would prove your idea wrong, typically below the most recent swing low for a long, with a little room for the wick that usually tests it. Second, volatility: measure the asset's average true range over the last 14 days and keep the stop at least one and a half to two ranges away from entry. Bitcoin, which moves around 1.3% on a typical day and 4% on a wild one, needs a very different stop from a small-cap that moves 8% before lunch.

Then size the position from the stop, not the other way round. Decide the money you will lose if the stop hits, divide by the distance from entry to stop, and that is your position size. A wide stop simply means a smaller position; it does not mean more risk.

Stop hunts, wicks and the case for an alert instead

Because stops cluster at obvious levels, price often dips through them and reverses, a pattern traders call a stop hunt or liquidity sweep. Placing stops beyond the obvious level, and sizing so that a stop-out is uncomfortable rather than damaging, is the practical defence. There is no way to avoid it entirely on a 24-hour market with thin weekend books.

For long-term holders the honest answer is often no stop-loss at all. If the plan is to hold through a full cycle, an automatic exit at minus 20% on a Sunday night sells the position to a wick and cannot buy it back. What a holder needs is to know when a level has broken so the thesis can be reviewed. That is a price alert: it fires, you read it, and you decide with the chart in front of you rather than letting the exchange decide for you.

Traders and holders can run both. A stop protects the money you cannot afford to lose; an alert a little above the stop tells you it is about to be tested, so the exit is never a surprise.

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Related terms

• Limit Order — an instruction to buy or sell only at a specified price or better
• Volatility — the degree to which a price moves around, in either direction
• Leverage — borrowed exposure that multiplies both gains and losses

Sources

• Binance Academy: What is a stop-limit order?
• Kraken Support: Order types
• Investopedia: Stop-loss order

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