What Is Bet Trading? Back–Lay Basics

Start here

A betting exchange lets you do two things a bookmaker never will: bet that something will not happen, and change your mind after you have bet. Almost everything else on this page follows from those two facts.

Bet trading means using them together — taking a position on a price, then closing it again when the price moves. It has more in common with buying and selling shares than with picking a winner on a Saturday afternoon. You are not trying to predict results. You are reacting to what other people are willing to pay.

That is a genuinely different skill, and it is one that can be learned. It also carries real risk, which we cover properly further down rather than tucking into a footnote.

Who this guide assumes you are

Someone who has placed a bet before and has never used an exchange. If you already trade, you can safely skip to the last two sections.

Exchanges vs bookmakers

With a bookmaker, you bet against the company. It sets the odds, builds in a margin that tilts the long-run maths in its favour, and it decides whether it wants your custom — accounts that win consistently are often restricted or closed.

An exchange is a marketplace. You bet against other people, and the exchange simply matches you with someone who wants the opposite side of the same bet. It takes a small percentage of your winnings, called commission, and is indifferent to who comes out ahead. Because there is no bookmaker's margin built into the odds, the prices are usually better, and consistent winners are generally left alone.

The trade-off is that a bet only happens if somebody takes the other side. A bookmaker will always accept your bet at its price. An exchange will only match you if your price suits someone else. That single difference is behind most of what feels unfamiliar at first.

Backing — the bet you already know

To back something is to bet that it will happen. This is the ordinary bet you have placed a hundred times, just with a different name.

Back a horse at odds of 4.0 with a £10 stake. If it wins, you receive £40 — your £10 back plus £30 profit. If it loses, you lose your £10. Your risk is your stake, and nothing more. That last point matters, because laying is not like that.

Laying — the other side of the coin

To lay something is to bet that it will not happen. For a moment, you are the bookmaker: you accept someone else's bet, and you keep their stake if they are wrong.

Lay that same horse at 4.0 for £10 and you win £10 if it does not win. If it does win, you pay out £30. That £30 is your liability — the amount the exchange sets aside from your balance the moment the bet is matched.

The one thing to take away about laying

When you back, you risk your stake. When you lay, you risk your liability, which is larger — and grows quickly at longer odds. Laying at 20.0 for £10 risks £190 to win £10. Nothing about laying is unsafe, but the number you are risking is not the number you typed in, and that catches people out.

Every matched bet on an exchange is one person backing and another laying. When you look at a market and see two columns of prices, that is what you are seeing: what people will back at on one side, and lay at on the other.

Reading a price

Exchange prices are decimal odds: the total returned for each £1 staked, your stake included. 4.0 returns £4 for every £1 — £3 of it profit. 1.5 returns £1.50, so 50p profit. Fractional odds like 3/1 mean the same as 4.0; exchanges just use the format that is easier to do arithmetic with.

A price is also a statement about likelihood. Divide 1 by the decimal price and you get the chance implied by it: 4.0 implies a 25% chance, 2.0 implies 50%, 1.25 implies 80%. When a price moves, the market's collective opinion about that chance has moved. A price getting shorter means more people think it will happen; a pricedrifting longer means the opposite.

Prices move constantly — on team news, on money arriving, and dramatically once an event is in-play. Those movements are the raw material of trading.

One more thing about prices, and it is the piece most guides leave out. You will always see two prices for the same selection: the best price you can back at, and the best you can lay at. They are never the same number. The gap between them is the spread, and it is the immediate cost of taking a position — you buy at one price and would have to sell at a slightly worse one.

Prices move in fixed steps called ticks, and the steps get finer at shorter odds. In a busy market the spread is usually a single tick and barely matters. In a quiet one it can be several, which means a position is behind from the moment you take it and the price has to move a meaningful distance before you are level. When people say a market is not worth trading, this is usually what they mean.

Trading out — profiting from movement

Here is where the two exchange facts combine. If you can both back and lay, you can take a position at one price and close it at another. If the price moved your way in between, you keep the difference — whatever the eventual result.

A worked example

You back a horse at 4.0 for £10. Before the off, money arrives for it and the price shortens to 3.0.

You now lay it at 3.0 for £13.33. Whatever happens in the race, you finish roughly £3.33 ahead, before commission.

If it wins: you collect £30 profit from the back and pay £26.67 on the lay. If it loses: you lose your £10 stake and keep the £13.33 lay stake. Either way, the same result — which is the whole point.

That is bet trading. Closing a position this way is called trading out — or greening up, because trading software traditionally shows the locked-in profit in green across every outcome. Our application does the arithmetic and places the closing bet for you, which is the single job it was built to do well.

The same move works in reverse. If you think a price is too short, lay first and back later at a longer price. And you do not have to close all of it — you can take some profit and let the rest ride.

Worth being clear about

Trading out locks in whatever the position is worth at that moment. If the price moved against you, trading out locks in a loss. It is a tool for controlling an outcome, not a way of avoiding one.

It is worth seeing that second case in the same detail, because it is at least as common as the first and it is the one that decides whether people last.

A worked example

Same start: you back at 4.0 for £10. This time the price drifts out to 5.0 — the market has decided it is less likely than you did.

Lay at 5.0 for £8 and you have fixed a loss of about £2 whatever happens. Hold instead, and you are back to an ordinary bet: £30 if it wins, minus £10 if it does not.

Neither choice is wrong. Taking the £2 loss is what a trader does; holding is what a bettor does. The mistake is drifting between the two without deciding — and that is a decision much easier to make before you are in the position than during it.

You can also close only part of a position. Trading out half leaves you a smaller bet running with a profit already banked, which is a gentler way to learn than choosing between all and nothing every time.

The words you will meet

Exchange jargon is mostly ordinary words used precisely. These are the ones worth knowing before your first session; the rest you will pick up as you go.

Back: A bet that something will happen. Your risk is your stake.
Lay: A bet that something will not happen. Your risk is your liability, not your stake.
Stake: The amount you are betting.
Liability: What a lay bet costs you if it loses. Set aside from your balance while the bet stands.
Market: One question with a set of possible answers — "which horse wins this race".
Selection: One possible answer within a market — a single horse, team or player.
Matched / unmatched: A bet only counts once someone takes the other side. Until then it sits unmatched, and you can cancel it.
Commission: The exchange’s percentage of your net winnings. Charged on what you win, never on what you stake.
Liquidity: How much money is available to match against. High liquidity means you can get in and out easily.
In-play: Betting while the event is happening. Prices move fastest here, in both directions.
Spread: The gap between the best back price and the best lay price. The immediate cost of taking a position.
Tick: The smallest step a price can move. Steps are finer at short odds than at long ones.
Position: What you stand to win or lose on each outcome, given every bet you currently hold in that market.
Trading out: Placing an opposing bet to close a position early, fixing your result before the event finishes.
Greening up: Trading out so that you show the same profit on every outcome, whatever the result.
Drift: A price getting longer — the market thinks it is less likely than it did.
Steamer: A price shortening quickly — money is arriving and opinion is moving.
Ladder: A vertical view of one selection showing every price and the money waiting at each. The traditional trading screen.

The exchanges

There are four exchanges worth your attention in the UK and Ireland, and they differ in ways that will affect you from day one. You do not have to pick the perfect one — you can open accounts at more than one, and most established traders do.

Connect Betdaq and Smarkets today. Matchbook is coming soon, followed by Betfair.

Betdaq

The long-established alternative to the market leader, with keen commission and a following in UK and Irish racing. Prices here often differ from the biggest exchange, which is exactly what makes watching more than one worthwhile.

Smarkets

A newer, cleaner operation with a flat commission structure that many traders find easier to reason about. Strong in football and politics, lighter in racing.

Matchbook

Coming soon

Focused on sports rather than racing, with a following among people who bet larger amounts less often. Worth having open when the sport suits it.

Betfair

Coming soon

The largest exchange by a wide margin, and where most liquidity lives — particularly in horse racing. If a market is tradeable anywhere, it is tradeable here.

Two things vary between them and both matter more than the branding. Commission is the percentage taken from your winnings, and a difference of a couple of points is significant if you trade often. Liquidity is how much money is waiting to take the other side of your bet — the single biggest practical difference between a market you can trade and one you cannot.

Liquidity concentrates in the big events. A televised horse race or a Premier League match will match your bet instantly. An obscure market on a quiet afternoon may not match it at all, or may only match part of it. Beginners very often start in thin markets because they are less busy and feel safer, and then find they cannot get out of a position. Start where the money is.

Opening an account is much like opening any other financial account: you will be asked to verify your identity and address before you can withdraw, so it is worth doing that at the start rather than discovering it later. There is one extra step that catches people out — to let software place bets on your behalf, an exchange has to grant API access. It is a setting on your exchange account, sometimes with a small one-off charge, and without it a trading application can show you prices but cannot act on them.

Where it goes wrong

We would rather you read this part than skip it. Trading gives you more control than ordinary betting, and more control is not the same as safety. These are the ways people genuinely lose money, in roughly the order they encounter them.

Not being able to get out
In a thin market there may be nobody to take the other side when you want to close. You are then holding the bet to the finish, whether or not that is what you intended. This is the mistake that costs beginners the most, and it is entirely avoidable by trading busy markets.
Underestimating a lay
The liability on a lay at long odds is many times the stake. Check the number the software shows you before confirming, every time, until it becomes second nature.
How fast in-play moves
Prices in a live event can change several times a second, and what you see always lags reality by a moment. Watching a market in-play without betting on it is a genuinely useful way to spend your first few evenings.
Chasing a loss
The urge to win back a bad position by staking more is the most reliable way to turn a small loss into a large one. Deciding your limits before you start, when you are calm, is worth more than any strategy.
Commission on a fine margin
Trading works on small differences. Commission is charged on your winnings and will quietly consume a strategy whose edge is thinner than the rate you are paying.

None of this is a reason not to start. It is a reason to start small, with money you have genuinely decided you can lose, and to treat your first few sessions as learning rather than earning. That is not us being cautious for form's sake — it is the approach that gives you the best chance of still being interested in three months.

If it stops being enjoyable

Betting should be entertainment you can afford. If it starts to feel like something you need to do, or you find yourself staking to recover losses, free and confidential support is available at BeGambleAware.org. BetTrading.net is for adults aged 18 and over.

When you are ready

You now know what backing and laying are, how a price carries meaning, what trading out does, and what separates a market you can trade from one you cannot. That is genuinely the hard part, and it is behind you.

What comes next is practical: an account with at least one exchange, our application on your machine, and a first small position taken carefully. Our software is the screen you do it on — live prices from your exchanges in one place, with the closing trade a single click rather than a calculation under time pressure. Your money stays in your own exchange accounts throughout; we never hold it and never take a share of what you win.

Trading involves risk and BetTrading.net never promises profits. 18+ only.