How to Use a Betting Exchange

A betting exchange is an important part of traditional matched betting. Unlike a bookmaker, which offers its own odds, a betting exchange allows customers to back and lay outcomes against other customers.

This gives you the ability to place an opposing bet alongside a bookmaker bet, helping to reduce your exposure to the sporting result.

However, betting exchanges can initially look confusing. You'll see different prices, amounts available to bet, back and lay options, and information about matched and unmatched bets.

Once you understand what these mean, the layout becomes much easier to navigate.

This guide explains how betting exchanges work, how to find suitable markets and what to check before placing a bet.

What is a betting exchange?

A betting exchange is a platform where customers can offer and accept bets against one another.

Rather than betting directly against a bookmaker, you're taking the opposite side of another customer's bet. The exchange provides the platform and handles the matching and settlement of bets.

There are two main types of bet:

Back: You're betting that something will happen.

For example, backing Team A to win a football match means you win if Team A wins, subject to the market's settlement rules.

Lay: You're betting that something will not happen.

For example, laying Team A to win means your bet wins if Team A does not win. In a standard match-result market, that would include either a draw or a win for the opposing team.

Being able to back and lay outcomes is what makes betting exchanges particularly useful for matched betting.

Understanding exchange odds

When you open an exchange market, you'll usually see a list of selections alongside available back and lay prices.

The prices represent the odds customers are currently offering or requesting.

For example, a football match might display:

These are illustrative figures.

The difference between the best available back and lay prices is often called the spread.

Generally, a smaller gap means a tighter market, which can make it a useful place to start looking for potential matches. It doesn't guarantee that you'll find a suitable bookmaker price.

You'll also see figures showing how much money is available at different prices. This is known as liquidity.

The precise layout, colours and labels vary between exchanges, so don't assume every platform displays information in exactly the same way.

How do back bets work on an exchange?

A back bet works in much the same way as a traditional bookmaker bet.

You choose an outcome, select the available odds and enter the amount you want to stake.

For example, imagine you back Team A to win £10 at odds of 2.00.

If Team A wins, your total return is £20, including your original £10 stake.

If Team A doesn't win, you lose your £10 stake.

The key difference is that on an exchange, another customer or available exchange liquidity needs to accept the opposing side of your bet for it to be matched.

You aren't simply placing a bet against the bookmaker's own odds.

How do lay bets work?

Lay betting is the opposite of backing an outcome.

Rather than betting that something will happen, you're betting against it happening.

For example, imagine you lay Team A to win at odds of 2.00.

If Team A wins, your lay bet loses.

If Team A draws or loses, your lay bet wins, subject to the market's settlement rules.

There are two important figures to understand when laying:

Lay stake: The amount you stand to win if the selection does not happen, before any applicable commission.

Lay liability: The amount you could lose if the selection does happen.

Liability is calculated as:

Lay stake × (Lay odds − 1)

For example, a £10 lay stake at odds of 3.00 creates £20 of liability.

That means:

• If the selection loses, you win £10 before commission.
• If the selection wins, you lose £20.

You therefore need enough money in your exchange account to cover the full liability, not just the £10 lay stake.

Some exchanges display the amount you stand to win, while others may present the amount you risk or your liability more prominently. Always check what the bet slip is asking you to enter.

What is liquidity?

Liquidity is the amount of money available to be matched at different prices within an exchange market.

For example, you might see:

These are illustrative figures.

If you need a lay bet larger than the amount available at 2.04, the whole bet might not be matched at that price.

Part of it could be matched at 2.04, with the remaining amount matched at a different price or left unmatched.

This matters because even a small change in the lay odds can affect your liability and the overall result of your matched bet.

Popular events and established markets can sometimes have more liquidity, but never assume there will be enough money available. Check the actual amounts displayed before placing anything.

How to find potential matches on a betting exchange

You don't need an automated OddsMatcher to begin identifying potential matches. You can search manually by starting with the exchange.

Here's a practical approach.

Step 1: Browse upcoming events

Open your betting exchange and look through its upcoming sports events.

Football match-result markets are one possible starting point because they are relatively straightforward to understand.

Step 2: Look for close back and lay prices

Check the available back and lay prices for different selections.

Markets where these prices are relatively close together can be useful places to investigate.

A smaller spread can indicate a more competitive market, although it doesn't guarantee that you'll find a suitable bookmaker price.

Step 3: Check the available liquidity

Look at the money available at the lay price you're considering.

Make sure the market has enough available to cover the amount you would need to match.

Step 4: Find the same event with a bookmaker

Open the bookmaker and locate the same event, market and selection.

For example, if you're looking at Team A to win on the exchange, find Team A to win in the bookmaker's standard match-result market too.

Step 5: Compare the relevant prices

For a standard qualifying bet, compare:

• The bookmaker's back odds.
• The exchange's lay odds.

It's important not to confuse the exchange's back price with its lay price. The two are different, and the calculator needs the correct opposing price.

Step 6: Calculate the potential result

Use the appropriate Monzenta calculator for the type of bet you're calculating.

For a standard single-event qualifying bet, use the Qualifying calculation. For an SNR or SR free bet, select the corresponding free-bet calculation.

Monzenta also has dedicated calculators for accumulator bets and Bet Builders. These use different calculation approaches, so make sure you select the tool that matches the bet you're working with.

The calculators can work out the relevant stakes, liability and potential results using the prices you enter. They don't independently find live odds, check exchange liquidity or confirm that the bookmaker and exchange markets are equivalent.

You'll need to verify those details yourself.

How to place a lay bet

Once you've identified a suitable market and calculated the required stakes, the exchange will generally follow a process similar to this.

1. Open the correct event and market

Find the exact event, market and selection you want to lay.

2. Select the lay price

Choose the available lay odds for your selected outcome.

Check that you're selecting the lay side rather than the back side.

3. Enter your amount and check the liability

Enter the amount requested by the exchange. Depending on the platform, this may be presented as the amount you want to win or another stake-related figure.

Check that the displayed liability agrees with your calculator result.

4. Review the bet slip

Before submitting, check:

• The correct selection.
• The requested lay odds.
• The amount you're staking.
• The total liability.

5. Submit and check the bet status

Submitting the bet doesn't automatically mean it has been fully matched.

You need to check its status before assuming your opposing bet is in place.

What are matched, partially matched and unmatched bets?

This is one of the most important parts of using an exchange.

When you submit a bet, it needs to be accepted by another customer or available exchange liquidity.

There are three possible outcomes.

Matched

Your entire bet has been accepted at the requested or an acceptable price.

The bet is now active.

Partially matched

Only some of your requested amount has been accepted.

For example, you might request a £20 lay bet but only £12 is matched.

The remaining £8 is still unmatched, meaning you don't yet have the full opposing bet in place.

Unmatched

None of your requested amount has been accepted.

Your bet is effectively an offer waiting for another customer to take the opposite side.

An unmatched bet may remain available until it is cancelled, matched or reaches a market-closing condition.

This is why checking your bet status is essential.

An unmatched bet can sometimes be matched later as prices change. Don't simply place another identical bet without checking whether your original order is still active. You could end up with more exposure than intended.

If a bet is only partially matched, understand exactly what remains outstanding before deciding what to do next.

What is exchange commission?

Betting exchanges typically charge commission on qualifying net winnings in a market, rather than building their margin into every displayed price in the same way as a traditional bookmaker.

The exact commission structure depends on the exchange and may vary by account, market or product.

For example, imagine your net qualifying winnings in a market are £10 and your applicable commission rate is 2%.

Your commission would be:

£10 × 2% = 20p

Your exchange profit after commission would therefore be £9.80.

This is a simplified example. If you have other bets or positions in the same market, the exchange's net market result can affect the commission charged.

This difference needs to be included when calculating your matched bets.

Always check your exchange's own commission terms rather than assuming every platform charges the same rate.

What about different markets?

Not all exchange markets are interchangeable.

For example, a standard football match-result market usually covers three outcomes:

• Home win.
• Draw.
• Away win.

But other markets might include:

• Draw no bet.
• Double chance.
• Over or under goals.
• Both teams to score.
• Half-time result.
• Player-specific markets.

These can have different settlement conditions.

If you're matching a bookmaker bet, you need to make sure the exchange market genuinely covers the same outcome.

For instance, backing Team A to win in a standard match-result market is not automatically equivalent to backing Team A in a market that excludes draws.

Accumulators and Bet Builders can be more complicated still. You need an exchange market that covers the same selections and settlement conditions as the bookmaker bet. A standard opposing lay bet will not automatically offset a multiple or a combination of selections.

Monzenta has dedicated calculators for accumulator bets and Bet Builders, but a calculation alone cannot make two different markets equivalent. Always check the actual market rules and available exchange prices before proceeding.

Never assume that two markets are equivalent simply because they refer to the same match.

What happens if the odds change?

Exchange prices and available liquidity can change as other customers place, amend or cancel bets.

A price you see when opening a market may no longer be available by the time you submit your bet.

This can mean:

• Your bet is matched at a different price.
• Only part of your bet is matched.
• Your bet remains unmatched.
• The resulting liability differs from your original calculation.

Always review the actual matched price and amount.

If your bet is not matched as expected, don't assume you're covered. Recalculate your position using the actual matched amount and odds before taking any further action.

Common betting exchange mistakes

A few common mistakes are worth looking out for:

• Choosing back instead of lay: Double-check which side of the market you're selecting.
• Confusing stake and liability: Make sure you understand how much you could lose if your lay selection wins.
• Ignoring liquidity: There may not be enough money available at your desired price.
• Assuming a bet is matched: Always check the matched amount in your bet history.
• Forgetting commission: Include your actual exchange commission in the calculation.
• Using the wrong market: Both bets need equivalent selections and settlement conditions.
• Leaving unmatched bets active: An old order could be matched later, potentially creating an unexpected position.
• Not checking updated odds: Recalculate if the actual matched prices differ from those originally entered.

Taking a moment to check these details can help you avoid mistakes.

Is using a betting exchange risk-free?

No.

A betting exchange doesn't remove the risks associated with gambling.

Prices can move, liquidity can change, bets may remain unmatched and mistakes can leave you exposed to losses. You may also need to keep sufficient funds available to cover exchange liabilities.

Never use money needed for essential expenses or borrow money to participate.

Matched betting is not guaranteed income and should never be treated as a solution to financial difficulties.

You must be 18 or over to gamble in Great Britain, and online gambling operators must verify customers' age and identity before allowing them to gamble.

If gambling is affecting you or someone close to you, free support is available through GamCare. Its National Gambling Helpline is available 24 hours a day on 0808 8020 133.

You can also read the NHS guidance on getting help for gambling problems.

Where to learn more

Now that you understand how betting exchanges work, these guides will help you put the different parts together:

• Promotional Betting: A Beginner's Guide
• How Qualifying Bets Work
• How SNR Free Bets Work
• How SR Free Bets Work
• Bet Builder Free Bets Explained
• Accumulator Bets Explained

Ready to calculate your bets?

Use the appropriate Monzenta calculator to work out stakes, liability and potential outcomes using your own bookmaker and exchange odds.

Monzenta provides information and tools to help you understand promotional offers. We don't operate bookmakers or betting exchanges, and we don't guarantee that an offer will result in a profit. Always check the provider's current terms before taking part.