Alerts are notifications you set to trigger when a market, instrument or account condition meets a rule you choose. They ping you by push, email, SMS or on-screen so you do not need to stare at charts.
They are not trades. An alert simply tells you something happened or might be about to. You still decide whether to place or adjust an order.
What can a market alert track?
Most platforms let you build alerts around price, activity or account status. Typical triggers include:
- Price level - for example, alert me if a share trades at 250p.
- Price moves - up or down by a set percentage within a period, such as a 3% intraday drop.
- Crossovers - price crosses above or below a moving average or trendline you draw.
- Volume spikes - traded volume passes a threshold relative to average.
- News and events - headlines containing terms like dividend, guidance or acquisition.
- Corporate actions and filings - results, stock splits, trading halts or regulatory announcements.
- Order and account status - order filled, partial fill, margin level approaching a limit, cash balance below a target, portfolio drawdown beyond a set percentage.
- Crypto specifics - funding or open interest changes where available, or price on a particular exchange.
Some providers also offer alerts when a custom indicator prints a signal, when a candle closes past a level rather than just touching it, or when a time-based rule hits, such as the opening range break.
How alerts are delivered and where you set them
You can usually create alerts from a watchlist, a chart or an order ticket. The behaviour varies by broker, exchange or data service, so check how your chosen platform interprets each rule.
- Delivery channels - mobile push, email, SMS, desktop pop-up and sometimes webhooks to send a payload to another app.
- Session control - choose to monitor during regular hours only, extended hours, or 24/7 for crypto.
- Expiry - alerts can be one-shot or persistent. Some auto-expire after a date; others stay live until you switch them off.
- Scope - instrument-specific, watchlist-wide, or portfolio-level. Advanced tools allow alerts on baskets or indices.
Delivery speed depends on connectivity and provider queues. Push and on-screen alerts tend to arrive fastest when your app is active. SMS and email can lag, especially at busy times.
Alert logic: levels, directions and trailing triggers
The detail matters. A poorly chosen condition can ring constantly or never fire. When you create an alert, consider:
- Which price - last trade, bid, ask or mid. In thin markets, last trade can print far from the current bid or ask. Using the ask for upside and the bid for downside can reduce noise if you are thinking like a buyer or seller.
- Crossing direction - trigger only if price crosses from below to above, from above to below, or either way. This avoids repeated firing as prices flicker around a level.
- Close vs touch - do you want a tick-by-tick touch or a confirmed break on the bar close. Close-based alerts reduce whipsaws but may be late.
- Repeat, cooldown and tolerance - decide if the alert should trigger once, repeat with a cooldown, or require a small buffer such as 0.1% past the level to confirm.
- Percent and trailing logic - instead of a fixed level, use a moving anchor. Example: alert me if price falls 5% from its highest point since the alert armed. This helps track momentum without guessing an exact number.
For crypto and some international shares, prices trade around the clock. Think about time-of-day noise and liquidity when choosing thresholds.
Alerts versus automated orders
An alert is a nudge. An order is an instruction. Mixing them up can cost money.
- Alerts - notify you when conditions are met so you can review and act. They do not buy or sell for you.
- Stop-loss, limit and stop-limit orders - execute automatically at or around specified prices, subject to liquidity and slippage.
If you want certainty that something happens while you are away, you need a live order. If you want judgement before acting, set an alert. Many traders use both: an alert well above a stop so they can reassess before a hard level breaks.
Practical examples across shares and crypto
Here are a few realistic setups and how they behave.
- Pullback entry - a share rallies from 200p to 240p. You would consider buying on a dip to 220p if momentum still looks healthy. Create an alert that triggers when the bid touches 220p during market hours. Set it to one-shot so it does not keep ringing in a choppy zone.
- Breakout watch - a crypto pair has resisted near 1,500 for weeks. You arm an alert on close above 1,510 on the 1-hour candle. It will not fire on a quick spike, only if the hour ends above the threshold.
- Risk control - your portfolio P&L should not fall more than 2% in a day without review. Set a portfolio-level alert at minus 2% that sends a push and an email. If received, you pause and recheck exposure.
- News sensitivity - a company is awaiting regulator feedback. You create a keyword alert for headlines mentioning approval, guidance, or deal terms such as cash offer, which often accompany acquisition announcements. You still read the story before acting.
- Trailing weakness - after a strong run, you want to know if a coin drops 6% from its highest price since you enabled monitoring. A trailing alert updates the high-water mark and fires only when the gap reaches 6%.
Limitations and good hygiene
Alerts are only as reliable as the data and settings behind them. A few points to watch:
- Data source and delays - free feeds can be delayed. Pre-market and off-exchange prints may be excluded. In crypto, the last price can differ across venues.
- Gaps and illiquidity - prices can jump over your level at the open or in thin trading. An alert might arrive late relative to the move.
- Noise - too-tight thresholds create alert fatigue. If you start ignoring pings, widen levels or switch to close-based rules.
- Device settings - ensure app notifications are allowed, do-not-disturb is configured, and your email or SMS details are current. Otherwise, the alert can trigger but you never see it.
- Provider differences - platforms vary in how they treat bid vs ask, sessions, and repeated triggers. Test with small, temporary alerts so you understand the exact behaviour.
Used with intention, alerts save time and sharpen decision points. Set clear rules, minimise noise, and review what fired each week so you refine the triggers that genuinely help your process.