What a percentage-based alert is
A percentage-based alert notifies you when a stock or ETF moves by a set percentage, instead of crossing a fixed price. Onepage.live calls one of these rules a watcher: pick a ticker, a threshold, and a baseline, and it watches quietly until the condition is met.
Why it needs a baseline
“Up 5%” or “down 8%” only means something relative to a starting point — the baseline. The same percentage move reads completely differently depending on what it’s measured against:
| Baseline | What it catches |
|---|---|
| Opening price | Today’s intraday move |
| Previous close | Overnight gaps and reactions |
| 7-day average | Short-term trend shifts, filters daily noise |
| 30-day average | A calmer monthly baseline |
| 90-day average | Quarterly context, less noise |
| 52-week high/low | Distance from a recent peak or bounce off a bottom |
| Your own price | Any number you choose to anchor to |
Picking the right baseline is what separates a useful alert from noise or a missed move.
Layering conditions
A single threshold-plus-baseline is often not enough — it either fires on ordinary wobble or misses the real signal. Onepage.live lets you combine up to 5 logics into one watcher, for example: up 5% vs the month and above the opening price. You only hear from it when every condition agrees.
Where to go next
This page covers the concept end-to-end. For specific setups:
- Alert when a stock drops 5% — a concrete walkthrough for a drop alert
- Stock percentage alerts vs fixed-price alerts — why percentage wins when you’re choosing a tool
- ETF price change alerts — why ETFs need slower baselines than single stocks