Signal copier or trading robot (EA): what each one does

A signal copier takes trades from a source you chose, such as a Telegram channel or another account, and places them on your account with the sizing and management rules you set. An expert advisor, or EA, is a program that decides its own trades from coded rules and places them itself. With a copier you are trusting a person's or a desk's decisions, and the plumbing that carries them. With an EA you are trusting the code, and the testing behind it.

What an EA is

An EA is a program written in MetaTrader's own languages, MQL4 or MQL5, attached to a chart in the terminal. It reads prices, applies its rules and opens, manages and closes trades without anyone deciding each one. EAs range from simple tools that only manage trades you opened yourself to full systems that trade around the clock. They run only while the terminal runs, so serious EA users rent a VPS, a remote computer that stays on.

What makes an EA hard to judge is that its sales case is usually a backtest: the rules run on years of past prices. A backtest is easy to tune until it looks perfect on the past and means little about the future. The only evidence that counts is a live account, long enough to include bad months.

What a signal copier is

A copier reads each new signal from its source and turns it into an order on your account, with the stop and targets attached and the lot size your rules produce. It does not decide which trades to take. The decisions come from the source: a provider's channel, or a master account. The guide to how a Telegram copier works walks through the five steps, and the places they break.

Here is where the confusion starts: many desktop Telegram copiers are delivered as an EA. The EA in that case is only the execution part, placing what a desktop program read from Telegram, and the decisions still come from the channel. A cloud copier does the same job on a server instead, with nothing running on your side; the copying guide compares the two set-ups.

The difference, point by point

• Who decides each trade. An EA: the code. A copier: the signal provider.
• What you are trusting. An EA: the rules and how they were tested. A copier: the provider's record, then the copier's execution.
• The main way it goes wrong. An EA: rules that only worked on past prices, or a martingale or grid system. A copier: a weak or dishonest channel, or missed and misread messages.
• How to check it. An EA: a live, independently tracked account through bad months. A copier: the channel's full record, then the copier's log compared with the channel.
• What you can see. An EA: trades, usually without the reason. A good copier: every signal, and why each was placed or skipped.

Martingale and grid EAs

Two families of EA deserve their own warning. A martingale system increases the size after a loss, so one win recovers everything. A grid system keeps adding positions as price moves against it. Both produce smooth balance curves for months, because they turn many small losses into rare large ones, and then a single long move ends the account. The equity curve, which counts open losses, is where the danger shows. Their marketing tends to share four phrases: no stop loss, a win rate with no stop count beside it, a recovery mode, and averaging. If you see two of them, read the live drawdown and the equity curve before anything else.

Signals can be followed badly in the same way. Doubling the lot after a stop is a manual martingale, and it ends accounts for the same reason.

Which one suits you

• You want a person's judgement behind each trade. Signals give you that, and you can ask the desk about a trade; an EA's reasons are locked in its code. Follow signals by hand at first, and copy them once you trust both the provider and your own rules.
• You want trades placed while you are at work. Either can, and a copier lets you keep a person's judgement while removing the delay. The copy or by hand guide covers who suits which.
• You are buying an EA. Ask for a live account tracked by a third party, its worst drawdown and its age, and never run one without a stop on every trade.
• You are choosing a copier. Judge the channel first, by its record with every stop on it. Then check the copier in test mode against the channel, signal by signal, before it trades money.

Our copier is a copier

The Forexero Cloud Copier does not decide trades. It reads the Telegram channels you are a member of, ours or anyone else's, and places their signals on your MT4 or MT5 account with your sizing and management rules, starting in test mode. It runs in the cloud, so nothing has to stay on at your end, and it can place and manage trades but cannot withdraw. Every signal it receives, places or skips is in its activity log with the reason. It is a separate subscription from our signals, whose full record is on the results page.