What is a forex gap, and why do most gaps fill?
Updated 29 October 2026 · 3 min read
A price gap is a range of prices the market skipped. One candle closes at one price, the next candle opens at a different price, and nothing traded in between.
On a chart, it looks like an empty space between two candles.
Why gaps happen in forex and gold
Forex and gold trade almost 24 hours a day, five days a week. Gaps still appear, for three main reasons:
- The weekly open. The market closes on Friday evening and reopens on Sunday evening (UTC). News that broke over the weekend is priced in at once, so Monday’s first price can be far from Friday’s close.
- The daily roll. Most brokers pause trading for a few minutes around the New York close. Liquidity is thin when trading restarts, and the first prices can jump.
- News shocks. A surprise announcement can move price so fast that a candle opens away from the previous one.
Most gaps on Gold (XAU/USD), EUR/USD and GBP/USD appear around the Asian session open, right after the daily or weekly restart.
Gap up and gap down
- A gap up forms when the market opens above the previous close.
- A gap down forms when the market opens below the previous close.
The gap zone is the range between the previous close and the new open.
What does “filling the gap” mean?
A gap is filled when price trades back through the whole zone and touches the previous close.
- To fill a gap up, price must fall back down to the previous close.
- To fill a gap down, price must rise back up to the previous close.
If price never gets back within the tracking window, the gap is unfilled (GapEdge marks it as expired).
Why do most gaps fill?
There is no law that forces a gap to fill, but several forces push price back:
- Thin liquidity at the open. The first prices after a restart often come from a few orders. When normal volume returns, price tends to move back toward where most trading happened.
- Overreaction. Weekend news is often priced in too strongly at the open, then corrected.
- Orders left behind. Stop orders and pending orders sit around the previous close and attract price.
Because of this, gaps in liquid markets fill often, and many fill within hours. You can check the live numbers for each market in the Gap Explorer.
How to read gap statistics
When you look at gap data, three numbers matter most:
| Metric | What it tells you |
|---|---|
| Fill rate | The share of gaps that filled. A high rate means fills are common, not guaranteed. |
| Time to fill | How long price took to close the gap. Short fills are easier to act on. |
| Gap size | Bigger gaps can take longer to fill and can move further against you first. |
The most important lesson: a high fill rate does not mean every trade wins. Price can move further away from the gap before it comes back. That extra move is where most losses happen, so position size and stop placement matter more than the fill rate.
How GapEdge helps
GapEdge watches Gold, EUR/USD and GBP/USD around the clock. When a gap opens, you get a push alert with the gap zone, its size and its direction, and you can follow the fill live in the app. Every gap is also published in the Gap Explorer — including the ones that never filled.
This guide is for education only and is not financial advice. Trading leveraged products carries a high risk of loss.
See every gap as it opens, and whether it filled.