Quick answer: A trading bot is software that opens and closes trades by following fixed rules. On MetaTrader 5 it is called an Expert Advisor (EA). It runs inside the platform, reads price on a chart and sends orders when its conditions are met. It does not predict the market and it can lose money.
Key takeaways
- A trading bot follows rules someone wrote. It does not think or guess.
- On MetaTrader 5, trading bots are Expert Advisors, saved as .ex5 files.
- The bot only works while the platform is open, which is why many people use a VPS.
- Your settings, like lot size and drawdown limits, matter as much as the strategy.
- Test on a demo account for weeks before using real funds.
What a trading bot actually is
A trading bot is a program that turns a trading plan into code. Instead of watching a chart and clicking buy or sell, you give the software a set of rules and it applies them for you. The rules might say something like: open a position when price closes above a moving average during the London session, risk a fixed lot size, and close it when a stop or target is reached.
On MetaTrader 5 (MT5), these programs are called Expert Advisors, or EAs. They are written in the MQL5 language and delivered as .ex5 files. If you want the deeper version of this, read our guide to MT5 Expert Advisors.
How a trading bot works, step by step
- It reads the chart. The EA is attached to one chart, like EURUSD on the 15-minute timeframe, and receives every new price tick.
- It checks its conditions. Most of the time nothing lines up, so it waits.
- It sends an order. When every entry rule is true, it asks your broker to open a position with the size you set.
- It manages the position. Stops, targets or exit rules decide when the trade closes.
- It checks your limits. Good EAs stop opening new positions when the account hits a drawdown or equity limit.
Every action is written to the Experts tab in MT5, so you can look back at what happened and when.
What trading bots can do well
- Consistency. The same rules run the same way on a quiet day and a busy one, with no second-guessing.
- Time. You don't need to sit at the screen for every entry.
- Speed and discipline. Orders go out the moment conditions are met, and limits are respected every time.
What trading bots can't do
- Predict the future. A bot applies rules to price. It has no special knowledge of what comes next.
- Adapt like a person. A strategy built for trending markets usually struggles in sideways markets, and the other way around.
- Remove risk. Losing trades and losing weeks are normal. Slippage, spreads and broker execution also affect results.
We cover the forex side of this in more detail in forex trading bots: what they can and can't do.
Where a trading bot runs
An EA runs inside MetaTrader 5, so the platform must stay open. If your computer sleeps or shuts down, the bot stops. That is why many traders rent a Windows VPS, a remote computer that stays on all day. See what matters when choosing a VPS for MT5.
How to try a trading bot safely
- Install it on a demo account first. Our step-by-step install guide shows how.
- Use the smallest lot size your broker allows.
- Set a drawdown limit and an equity floor before you start. Read risk management for trading bots.
- Let it run for several weeks and review the Experts log.
- Only then decide whether it fits a live account. Here is how to move from demo to live.
How to judge a trading bot before buying
Be careful with any seller that promises returns, shows only screenshots of winning months, or pushes a countdown timer. We list the warning signs in 10 red flags of a trading bot scam. A serious seller explains the rules in plain language, shows the inputs you control and is honest that the software can lose money.
Frequently asked questions
Are trading bots legal?
Using automated trading software on your own account is legal in most countries, and MetaTrader 5 supports it natively. Check your broker's terms and local rules.
Do trading bots make money?
Some strategies are profitable over some periods and lose in others. No bot can promise results, and you should expect losing trades and losing weeks.
What is the difference between a trading bot and an Expert Advisor?
On MetaTrader 5 they mean the same thing. Expert Advisor is the platform's name for an automated trading program.
Do I need to know how to code?
No. You install the .ex5 file, attach it to a chart and set the inputs. Coding is only needed if you want to build your own strategy.
Want to see an EA built around limits you control? Remix Ai is an Expert Advisor for MetaTrader 5 with lot size, session hours, drawdown and equity limits. Launch price $199, one-time payment.
Risk disclosure: this article is for education only and is not financial advice. Trading with automated software carries a high risk of loss, and past or simulated results do not predict future results. Remix Ai sells software. We do not manage accounts, offer copy trading or sell trading signals.