What Is a Betting Exchange? How Back and Lay Betting Works

A betting exchange is a platform where bettors bet against each other instead of against a bookmaker. One person backs an outcome to happen, another lays it, meaning they bet it won't, and the exchange matches them up and takes a small commission from whoever wins.

Because the exchange doesn't set the odds or take a side, it has no reason to limit winning customers. Its prices come from what bettors are willing to offer each other, which makes the busiest exchanges some of the sharpest prices in betting. Below, we show how it works with real Betfair Exchange prices from Manchester City vs Fulham.

How a betting exchange works: backing and laying

Every bet on an exchange has two sides. The backer bets that something will happen. The layer bets that it won't, and takes on the role a bookmaker would normally play.

Here's Manchester City to beat Fulham on the Betfair Exchange on 13 November 2026:

Backing works like a normal bet. £10 on City at 1.45 returns £14.50 if they win, a £4.50 profit.

Laying is the reverse. Lay City for £10 at 1.48 and you're accepting someone else's £10 bet on City. If City don't win, you keep their £10. If City win, you pay them their £4.80 profit. That £4.80 is your liability, and the exchange holds it from your balance until the match is settled.

The small gap between the back price (1.45) and the lay price (1.48) is the spread. On busy markets it's tiny, which is one reason exchange prices are so close to the true odds.

Winnings in this table are before commission, which we cover next.

How betting exchanges make money: commission

A bookmaker makes money by building a margin into its odds. An exchange makes money by charging commission on net winnings in each market. If you lose, you pay nothing.

On Betfair Exchange, the standard rate for football and most sports is 5% of your net winnings on a market, and 2% on UK and Irish horse racing win markets. Other exchanges set their own rates, and some charge less.

Commission changes the real price you're getting. On the City example at 5%:

• Back City £10 at 1.45: £4.50 profit, minus 23p commission, leaves £4.28. That's an effective price of about 1.43.
• Lay City £10 at 1.48: if City don't win, £10 profit minus 50p commission leaves £9.50.

So when you compare an exchange price with a bookmaker's, take commission off first. 1.45 on the exchange is really 1.43 after 5% commission, which a bookmaker offering 1.44 would beat.

Betfair also applies an extra Premium Charge to a small number of very profitable accounts that pay little commission. For most bettors it never comes into play, but it's the exchange's equivalent of a bookmaker limiting winners.

Betting exchange vs bookmaker

The catch with exchanges is liquidity. On a Premier League match there's plenty of money to match your bet. On a lower-league game or an obscure market, there may be little or nothing at the price you want, and the gap between back and lay prices gets wider.

Why exchange prices are sharp, and when they aren't

On a bookmaker, one company decides the price. On an exchange, the price is set by everyone willing to put money on it, including professional bettors with big stakes. If a price is wrong, someone backs or lays it until it isn't. That's why the main exchange markets sit very close to the sharpest bookmakers, like Pinnacle.

How sharp an exchange price is depends on liquidity: how much money is waiting to be matched. You can see it in the gap between the back and lay price on the same match:

The match result is one of the most traded markets on the exchange, so the gap is just 0.03. The -1.5 handicap attracts far less money, so the gap is much wider, and the back price is a less reliable guide to the true odds. As a rule, trust exchange prices most on big markets close to kick-off.

Which betting exchanges are there?

In the UK and Europe, Betfair Exchange is by far the biggest, and the one most bettors mean when they say "the exchange". Smarkets and Matchbook are the main smaller alternatives, each with its own commission rates. Betdaq, one of the oldest exchanges, closed its markets on 21 October 2026 after joining Matchbook, which now carries the Betdaq brand. You'll also see exchange brands such as Orbit Exchange in odds comparisons, mainly serving markets outside the UK.

In the US, exchange-style sports betting now runs mainly through prediction markets regulated by the CFTC, the federal regulator for futures markets. Kalshi and Polymarket are the best known, and ProphetX and Novig work the same way for sports. You buy and sell contracts on an outcome instead of backing and laying, but the idea is the same: you trade against other people, and the platform takes a fee rather than a margin. Sporttrade, once the main US sports exchange, closed its sports betting product in May 2026 to rebuild as a prediction market.

Rules and availability differ by country and state, so check what's legal where you live before signing up anywhere.

Comparing exchange and bookmaker prices on OddsHub

OddsHub shows Betfair Exchange, other exchanges, and prediction markets like Kalshi and Polymarket in the same list as 490+ bookmakers. So you can see straight away whether the exchange or a bookmaker is paying more.

On City vs Fulham, over 2.5 goals was 1.54 on the exchanges and 1.50 at the best bookmakers. At 5% commission, 1.54 works out at about 1.51, so the exchange was still just ahead. On another match, commission could easily flip it. That's why it pays to check both every time.

Turn on the Fair odds toggle to see the no-vig price alongside, so you know whether the best price on offer is actually worth betting.

Compare exchange and bookmaker odds in one place

Exchanges, bookmakers and prediction markets all price the same matches differently. OddsHub puts them side by side with no-vig fair odds alongside, free, so you can take the best price every time without opening ten tabs.

Compare odds free on OddsHub