Best Betting Exchange Sites in Great Britain — How They Work, What They Cost, Who They're For

Updated October 2026

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A betting exchange is a marketplace, not a bookmaker. Two customers take opposite sides of the same event, the platform sits in the middle to match them and takes a slice of net winnings as commission. That single difference changes what a price means, what the platform earns and what a free bet is actually worth — and it is the reason the same match can carry tighter odds on an exchange than at any high-street bookie. The page below walks through how exchanges work under a Great Britain licence, what the commission costs in real numbers, which paths exist for a bettor this year and where each one fits.

Reviewed as of 27 October 2026 against the Gambling Commission’s public register, the licensed general betting and exchange operators covered here, and the customer-protection rules named on each platform’s own UK terms.

How an Exchange Differs from a Bookmaker

On a traditional bookmaker the customer backs an outcome at the firm’s price. The bookmaker takes the other side, sets the margin into the odds and pays out of its own pocket when the customer wins. On an exchange the customer backs an outcome and another customer *lays* it — wagers that the outcome will not happen. The platform does not take a position; it pairs the two bets and earns a commission on the customer’s net winnings per market. Losing bets carry no commission. That single structural point ripples through everything else.

Three consequences follow, and each one shows up the moment a customer compares prices.

A back bet pays out at the price the backer matched, with no margin withheld inside the odds. The exchange’s revenue sits in commission rather than in the overround. Odds on a typical football match tend to be a touch tighter on an exchange than at a fixed-odds bookmaker, because the platform is not pricing for its own book.

A lay bet does not exist at a bookmaker. It is the bettor’s role to quote a price and stake, and the most a layer can lose — *liability* — is the backer’s stake multiplied by the lay price minus one. Lay betting is what makes trading a match back and forth possible, and it is what underpins every exchange strategy that goes in and out of a position before the whistle.

The exchange’s house edge sits in commission, not in the price. Betfair, Smarkets and Matchbook each state their own rate in their terms. A 2 per cent commission on net winnings is the kind of figure a customer sees most often, with promo windows where the rate drops to zero for a fixed period after sign-up. The point is that the headline odds and the commission are two separate numbers: a customer who compares only the price has missed the line that actually pays the platform.

Betfair, Smarkets and Matchbook are the three platforms that operate as full exchanges under a Gambling Commission *betting intermediary* licence. Everything else on the page is licensed for general betting standard (real events) and trades against its own book; it is included for the bettor comparing exchanges to fixed-odds books on price, market depth and features. Each operator’s licence and its scope are set out in the ranking further down.

The Statutory Frame — Gambling Commission Licensing

The Gambling Commission licenses the whole commercial market in Great Britain under the Gambling Act 2005. For an online sportsbook or exchange whose facilities are used by customers in Great Britain, a Commission licence is compulsory wherever the operator is based. That rule has held since the Gambling (Licensing and Advertising) Act 2014 — a Curaçao, Malta or Gibraltar licence on its own is not a substitute for serving British customers.

Two licence categories matter for this page. A general betting standard (real events) licence covers fixed-odds sportsbooks and any in-house betting products. A betting intermediary licence is the separate category that exchanges hold. The Commission’s public register can be searched by business name, trading name, domain or account number, and is the only test of whether a brand actually holds a licence. A licensed brand can use either a .com or a .co.uk domain; the domain proves nothing on its own.

The customer-facing side of the rules is the Licence Conditions and Codes of Practice. Since 7 May 2019 an operator has to verify a customer’s name, address and date of birth before the first deposit — including before a free bet or a bonus can be claimed. Identity verification is the reason anonymous play is not on offer at any licensed site. From 14 April 2020 credit cards are banned for gambling in Great Britain, including credit-card-funded e-wallet top-ups; debit cards and bank transfers are not covered by that ban.

The statutory frame for offshore sites is plain and worth stating once. There is no offence aimed at a customer who simply bets with an unlicensed operator, but the loss of protection is real: no GAMSTOP, no Commission complaints route, no approved alternative-dispute-resolution service, no British recourse if funds are withheld. Operators running on an offshore licence are not bound by the 10x bonus cap or by the financial vulnerability check. Neither side is the default safe choice; the question is which protections a customer is willing to lose.

Responsible Gambling and Player Protection

The protections a Commission licence buys a customer are concrete and traceable.

GAMSTOP is the national multi-operator self-exclusion scheme and a mandatory licence condition for online operators since 31 March 2020. A customer can self-exclude for six months, one year, five years or five years with auto-renewal. After the minimum term the exclusion stays in place for a further seven years unless the customer asks GAMSTOP to remove it. Every GB-licensed online operator, exchange or fixed-odds, takes part in GAMSTOP.

Customer checks before a first deposit are required under the Commission’s identity-verification rules. Every operator covered below checks name, address and date of birth before money moves. That is the mechanism that keeps the no-anonymous-play rule honest.

The financial vulnerability check runs when deposits minus withdrawals cross £150 in a rolling 30 days, in force since 28 February 2025. It is a public-record check (bankruptcy, county court judgments) rather than an income or credit-reference check. A separate, heavier *financial risk assessment* was announced by the Commission on 7 July 2026 in a staged plan with no start date; it is not yet in force. There is no state-set deposit or loss ceiling for betting — the deposit ceiling a customer sees is the one they set themselves, with the operator’s tools.

Bonuses at promotional rules — meaning the wagering requirements on bonus funds are capped at 10x. A £10 bonus at 50x needs £500 of qualifying bets; under the new cap, no more than £100. Mixed-product promotions — an offer that demands betting on two or more product types, for example “bet on football to get free spins” — are banned. Whether the cap applies to free bets whose stake is paid back is not established; it is the kind of line a customer reads in the terms.

Help is run by GamCare (the National Gambling Helpline), GambleAware, the NHS gambling clinics network and Gamblers Anonymous. The Commission’s own role is to license and enforce; the help lines are the customer-facing end.

The architecture is the same for an exchange and for a fixed-odds bookmaker. The differences appear in the next layer down — in the price and the commission — and that is where the choice between the two starts to pay off.

Crypto, Anonymity and Payment Method

No licensed British sportsbook or exchange accepts cryptocurrency. The Commission’s identity-verification rule applies before a first deposit, including for a free bet, so anonymous play is off the table at any operator that holds a GB licence. The page does not recommend offshore platforms as a route around that, because the protections above stop applying at the same point.

Debit cards and bank-based payments are not restricted by any Commission rule and are the mainstream route at every operator below. The credit-card ban covers credit-card-funded e-wallet top-ups; using an e-wallet funded from a debit card is unaffected. Each operator’s own terms set out the methods it actually accepts, withdrawal times and any minimums — the choice between operators on payments comes down to those lines, not to a regulator-level distinction.

Bonuses and Free Bets at an Exchange

Bonuses are where the marketing and the maths most often disagree. A “free bet” is normally a token whose *stake is not paid back* with a winning bet — the return is the winnings, not the stake plus the winnings. A “bet £10, get £30 in free bets” headline is therefore worth a third of what it looks like on first reading.

Two numbers decide how much a bonus is actually worth. The wagering requirement is how many times the bonus base (the bonus alone, or the bonus plus the deposit, depending on the operator’s terms) has to be turned over in qualifying bets. The minimum odds for those qualifying bets decide whether the turnover can be cleared with low-margin favourites or has to be played at a price where the bookmaker’s overround bites. A bonus with a 10x wagering requirement on the bonus only and minimum odds at evens is a different proposition from a 5x requirement on bonus plus deposit at minimum odds of 4/6 (5/1 in fractional). The headline rarely tells a customer which one they are looking at.

The promotional rules named above — the 10x cap on bonus wagering and the ban on mixed-product promos — sit on top of the operator’s own terms. The cap does not affect every promotion a customer meets, and a free bet whose stake is paid back on a win sits in a separate corner of the rules; the text of the operator’s own terms is what decides it.

Exchange platforms do not run the kind of headline-grabbing deposit bonuses fixed-odds books do. The standard pattern is a commission discount over a fixed period after sign-up, sometimes with a minimum first deposit to unlock the 0 per cent window. A bettor weighing commission in pounds is comparing apples to apples with a sportsbook weighing a free bet in pounds; both numbers look like marketing but only one is a true discount on what the customer pays. The fixed-odds bonus is a giveaway with conditions; the exchange’s 0 per cent window is a temporary reduction in the platform’s take.

Mobile Apps and Exchange Trading on a Handset

Every platform covered below runs on iOS and Android through the App Store and Google Play, and most run a fully featured mobile site for browsers. The British punter’s exchange experience on a phone has come a long way since the early web platforms. The key differences are the ones that show up at the point of placing a bet.

An exchange app has to show two-sided pricing, the depth of the order book, the customer’s open position, the liability on any lay bet and the cash-out or *trade-out* button at the right point. A sportsbook app has to show one price, the bet builder, the in-play markets and the cash-out button. The screens are built for different jobs and they feel different in the hand.

Live streaming is a separate question. Betfair Sportsbook, Smarkets and Matchbook each stream at least some events inside the app — horse racing and greyhound racing are the most common picks. Fafabet and Bet600 add Best Odds Guaranteed on UK and Irish racing; on a phone the BOG payout shows up in the bet history rather than on a separate screen. The trade-out on a phone is the most underrated feature on an exchange app: a bettor can move in and out of a position in three taps, and that is what makes the difference when a goal goes in during the 80th minute.

In-Play, Cash Out and the Trade-Out Button

In-play betting at a licensed bookmaker is the option to place a bet after an event has started; the controls are the operator’s licence conditions and its customer-protection duties, not a separate statute. Betfair, Smarkets, Matchbook and the fixed-odds books below all run in-play markets on football, tennis and the major US sports. DAZN Bet and Midnite run in-play across their full pre-match card, with the depth varying by event.

Cash out at a bookmaker is the bookmaker’s offer to buy the bet back before the event settles. The price is the bookmaker’s, not the market’s, and cash-out availability is not guaranteed — if the platform cannot quote a price the bet stands. That clause is on most bookmaker help pages, including DAZN Bet’s, and a bettor who reads it has saved themselves a misunderstanding on a quiet market.

A trade-out at an exchange is a different thing. The customer places an opposing bet at the current exchange price to lock in a profit or a loss before the event settles. The price is the market’s, the commission is the exchange’s, and the customer is in control of when to exit. Trading out is the move that makes in-running strategies possible, and it is the reason an exchange app and a fixed-odds app sit in different corners of the punter’s phone.

Bet Types, Markets and the Numbers on the Odds

The bet types at a fixed-odds bookmaker and at an exchange are the same single, double, treble and each-way backbone, with the same engine at the back — the odds are probabilities in disguise. The differences are in the price and in how the platform earns.

An exchange lets the customer back and lay. A fixed-odds bookmaker lets the customer back only. The each-way bet is a fixed-odds feature, available at every bookmaker below for horse racing and most major sports, and is two bets of equal stake (so the stake doubles); the place terms vary by race and by operator. Accumulator insurance — the “acca insurance” line in a promotion — pays back the stake as a free bet if one leg lets the customer down. Bet builders let the customer combine markets from the same event into one price.

The headline numbers to compare are odds and margin. The margin is the bookmaker’s take — the percentage of every unit staked that the platform keeps on average. The narrower the margin, the tighter the price. A two-way market at decimal odds 1.90 on each outcome is the simplest worked example: the implied probabilities add up to 1 ÷ 1.90 + 1 ÷ 1.90 = 1.0526, so the payout share on a winning bet is 1 ÷ 1.0526 = 95.0 per cent and the margin is 1 − 0.950 = 5.0 per cent. The example is illustrative, not a quoted price; every real market sits somewhere between 2 and 10 per cent depending on the sport and the platform.

On an exchange the same 1.90 / 1.90 market carries commission on top. Smarkets’ 2 per cent commission on net winnings takes the customer’s effective return on a winning back bet to 0.95 × 0.98 = 0.931 per unit staked — the same starting margin, less the commission, with no hidden take in the price. The number is the platform’s take laid out in two pieces rather than one.

Exchanges also limit the odds they display. Across the platforms, prices generally sit between 1.01 and 1000 on the decimal scale. Bet sizes are not restricted by the exchange as long as another customer is willing to match the stake — that is the mechanism by which a customer gets a £50,000 bet on at 1.10 if someone else wants the other side. Liquidity is what makes that possible; the depth shown on the platform is the queue of customers waiting to take the other side.

The Landscape of Betting Exchanges and Fixed-Odds Books

The platform set this year divides cleanly. Three operators hold a Commission betting intermediary licence and run as exchanges; the other seven hold a general betting standard (real events) licence and trade against their own book. Both are licensed and both are inside the British protection regime; the difference is the model.

The table reads across the three exchanges and the seven fixed-odds books in the same set. Every licence number above is on the Commission’s public register; the table is the full landscape a British punter sees when they sort the register by betting intermediary and general betting standard (real events). The platform with the deepest exchange product sits at the top; the fixed-odds books fill in the comparison a customer makes when they want a free bet, a bet builder or a streaming service that the exchanges do not all run.

Betfair — The Exchange Inheritor of Flutter’s Marketplace

Betfair is the exchange Flutter merged into in 2001, when the original exchange site closed in January the following year. The Commission account is 39439, held by PPB Counterparty Services Limited, with a remote general betting standard (real events) licence that covers the sportsbook and a separate betting intermediary licence for the exchange. The Betfair Sportsbook side adds in-play betting, Bet Builder and a 90 Minute Payout market on football; the app runs free live streaming on UK and Irish horse racing and on football fixtures around the major leagues.

The commission on the exchange is on the higher end of the platforms here, and Betfair runs promo windows for new customers with a lower rate over a fixed period. The depth of liquidity on Premier League football, on the major horse racing meetings and on the major US sports is the practical advantage the platform has over the smaller exchanges: a bettor can place a four-figure bet at 1.10 and find a taker for it in seconds during a busy match.

The trade-off for the depth is the price of the small bet. The smaller exchanges run tighter commission rates on the everyday market, and the price on a £20 back bet on a televised football match is closer to a true 50/50 there than on the bigger books. A bettor who wants the order book and is willing to pay the commission line is on Betfair; a bettor who is making smaller bets and wants a cheaper commission line looks at Smarkets.

Smarkets — The 2 per cent Commission Platform

Smarkets runs a 2 per cent commission on net winnings per market for the standard customer, with a 0 per cent window for new customers over 60 days against a £10 minimum first deposit. The platform is on Commission account 39173, held by Smarkets (Malta) Limited, under a remote betting intermediary licence. The exchange product is the platform’s centre of gravity — sportsbook features sit alongside it rather than dominating it.

The depth on the big televised football and the major US sports is solid rather than dominant. The price on smaller markets — Championship football, the lower tennis tiers — is the line a customer checks against the bigger exchange. On the markets where both have liquidity the price is comparable, and the 2 per cent versus the bigger platform’s higher rate is the difference that pays over a season.

The 60-day 0 per cent window is the marketing line. For a customer who places £1,000 of net winning bets during that window at a true 50/50 market, the saving against the standard 2 per cent is £20 of commission. After the window, the same customer’s effective return sits at 0.98 × payout share on each winning market; the line never drops to zero.

Matchbook — The Horse Racing and Greyhounds Exchange

Matchbook runs on Commission account 39504, held by Triplebet Limited, with both a general betting standard (real events) licence and a betting intermediary licence — the only platform in the set that holds both at once. The exchange is the centre; the sportsbook adds Bet Builder, multiples, in-play betting and live streaming of horse racing and greyhounds. The platform is built around racing, and the order book on a big meeting is where its liquidity sits.

The commission rate is on the lower end of the exchanges here, and the promo structure for new customers is a commission discount window. For a customer whose betting is heavily weighted to horse racing and greyhounds, Matchbook is the exchange that pays the deepest dividend on the order book depth. For a customer whose betting is heavily weighted to football or the major US sports, the order book at Matchbook is thinner than the bigger platform’s, and the price on a £200 bet at 1.50 is more easily matched at the bigger exchange.

The dual-licence structure is the practical advantage: the customer does not have to leave the platform to place a fixed-odds bet or a bet builder on the same fixture, and the in-running trade-out is on the same screen. The Bet Builder at a fixed-odds book is a different feature from the trade-out at an exchange, and Matchbook is the only platform in the set that ships both without a second account.

Kalooki Sportsbook — The Recently Licensed Fixed-Odds Book

Kalooki Sportsbook is operated by Kalooki Sports Book Ltd, company number 12938274, and licensed by the Commission under account 57730. The platform joined the GB-licensed market as a remote general betting standard (real events) operator and is a GAMSTOP member. The site carries the standard identity-verification pre-deposit check that every Commission-licensed operator runs.

The platform is small against the bigger fixed-odds books here, and the depth on the less popular leagues is the line a customer checks. The Best Odds Guaranteed feature that Fafabet and Bet600 run is the kind of feature the platform does not lead on; the marketing line is the basic Commission-licensed product at the price the order book delivers. For a customer who wants a Commission-licensed sportsbook that runs without the higher-profile marketing features, Kalooki is the operator on the list whose own terms a customer reads first.

BetTom — The Welcome Package Sportsbook

BetTom is on Commission account 64959, held by Bet Tom Limited, under a remote general betting standard (real events) licence; its sports welcome offer is 50 per cent back as a free bet up to £50, with a matching 50 per cent back up to £50 as free slot funds for casino play. The two parts of the offer are the headline; the wagering terms on each part sit in the full terms the operator publishes.

A £10 deposit that triggers the offer returns up to £5 as a sports free bet and up to £5 as casino free slot funds on the 50 per cent match. The free bet’s stake is not paid back with a winning bet; the return is the winnings at the matched price, less the 0 per cent commission the operator does not charge because the platform is fixed-odds. The wagering on the free slot funds is the casino end of the offer, which sits under the operator’s casino terms. The promotional rules cap bonus wagering at 10x on the bonus amount and ban mixed-product promotions; a customer reading the offer checks the operator’s terms for whether the offer sits inside or outside the cap.

For a customer comparing welcome offers, BetTom’s headline is in the same band as Midnite’s. The decision between the two is the difference between BetTom’s split sports and casino welcome and Midnite’s sports-focused £25 free bets plus 50 free spins package.

DAZN Bet — The Streaming-Native Sportsbook

DAZN Bet runs on Commission account 48756, held by DZBT Limited, with a remote general betting standard (real events) licence; this platform ships Cash Out, Bet Builder, daily bet boosts and in-play betting. The cash-out availability clause is on the operator’s help pages: if the platform cannot quote a cash-out price, the bet stands. The clause is on most fixed-odds books and is the line a customer reads before staking on a quiet in-play market.

DAZN Bet’s relationship with the DAZN streaming subscription is the practical differentiator. For a customer who watches the sports they bet on through DAZN’s streaming, the in-play markets line up against the broadcast on the same screen. The price on the everyday market is in the band of the other fixed-odds books; the value-add for the customer is the streaming-bundled experience rather than a tighter overround. A customer without a DAZN subscription is on the same pricing as any other Commission-licensed sportsbook.

Midnite — The Pre-Match £5 Qualifier Sportsbook

Midnite is on Commission account 101839, held by Midnite Limited, with a remote general betting standard (real events) licence; the site cites its Commission licence on the home page and ships an in-play product, an acca builder, popular accas and price boosts with maximum-stake limits. The sports welcome offer for new customers is a £5-or-more bet on pre-match odds of EVS (2.0) or greater within 14 days of sign-up, returning £25 in free bets and 50 free spins, valid for 7 days.

The £5 qualifier is the marketing hook, and it sits well below the deposit threshold a customer meets at other platforms in the set. A £5 bet at minimum price 2.0 returns up to £25 in free bets plus 50 free spins on a qualifying account. The free bet stake is not paid back on a winning bet; the free spins carry their own wagering on the casino side, and the 7-day validity is the deadline a customer works against.

For a customer comparing welcome packages, Midnite’s headline is the lower-deposit route to a sportsbook free bet package. For a customer comparing in-play depth and streaming, the platform’s in-play card is comparable to the other fixed-odds books, with the maximum-stake limits on price boosts the line a customer checks before staking on the boosted market.

Star Sports — The Racing-Led Independent

Star Sports runs on Commission account 9177, held by Star Racing Limited, under a remote general betting standard (real events) licence; the platform is independent and racing-led, with pre-event and in-play markets, Bet Boosts, Daily Specials and Weekend Enhanced Boosts and in-play on football, horse racing, golf and the major US sports.

The racing orientation shows in the price on the major meetings and in the Best Odds Guaranteed feature the platform runs on UK and Irish racing. The order book on smaller football leagues is thinner than the bigger fixed-odds books; the marketing line on football is the Weekend Enhanced Boosts rather than the everyday price. For a customer whose betting is racing-weighted, Star Sports is the independent bookmaker in the set with a racing-led order book.

Fafabet — Best Odds Guaranteed on UK and Irish Racing

Fafabet runs on Commission account 57385, held by Taichi Tech Limited, and maintains a remote general betting standard (real events) authorisation; the platform ships Best Odds Guaranteed on UK and Irish horse racing win and each-way bets from 9am on race days: if the starting price (SP) is bigger than the price the customer took, the bet is paid at the bigger of the two. The mechanism is the value proposition the platform leads on.

The each-way stake doubles under BOG (the win half and the place half each pay at the bigger price if SP is bigger). The Best Odds Guaranteed feature is one of the practical reasons a customer picks a racing-oriented sportsbook over a tighter-priced one for the major meetings; the difference between an early-price 6/1 and an SP of 10/1 is the same £20 of profit on a £10 each-way stake. The platform’s other markets — the football, the US sports — are in the band of the other fixed-odds books rather than leading the field.

For a customer whose betting is weighted to UK and Irish racing and who reads the form, Fafabet’s BOG is the headline feature. For a customer whose betting is weighted to football or the US sports, the operator is one option in a longer list at similar pricing.

Bet600 — Best Odds Guaranteed on Horse Racing

Bet600 runs on Commission account 44731, held by Tyche Tech Limited, and is registered under a remote general betting standard (real events) permit; the platform ships Best Odds Guaranteed on horse racing: if the starting price is bigger than the early or show price the customer took, the bet is paid at the SP. The clause is the marketing line on racing.

The smaller scale of the platform against Fafabet and Star Sports is the practical line a customer checks. The Best Odds Guaranteed feature is the same on the racing side; the depth on the rest of the card — football, the US sports — is thinner than the bigger fixed-odds books. For a customer whose betting is a small-stake racing book, Bet600 is one of the smaller racing-oriented sportsbooks on the Commission’s register.

Choosing Between an Exchange and a Fixed-Odds Book

The choice between an exchange and a fixed-odds book comes down to a few practical questions.

A customer who wants to back and lay, who wants to trade out of a position during a match and who values the tighter commission rate on a winning market is on an exchange. The three exchanges here are Betfair, Smarkets and Matchbook; the difference between them is the order book depth on the markets the customer bets on and the commission rate on net winnings. For a customer who bets primarily on televised football, on the major US sports and on the major horse racing meetings, Betfair’s depth is the practical line; for a customer whose betting is weighted to smaller-stake markets or who places fewer bets, Smarkets’ 2 per cent commission is the saving that compounds over a season; for a customer whose betting is racing-weighted, Matchbook’s racing-led liquidity and dual-licence structure is the platform to compare against.

A customer who wants a fixed-odds book with a bet builder, a welcome offer or streaming integrated with the betting is on a fixed-odds sportsbook. The seven fixed-odds books here split on the welcome package, the racing features and the streaming tie-up. Betfair Sportsbook’s 90 Minute Payout market, Betfair’s and Matchbook’s racing streaming, Fafabet’s and Bet600’s Best Odds Guaranteed, DAZN Bet’s streaming tie-up and Midnite’s £5 qualifier are the marketing-led differences. The everyday price on the bigger leagues is in a narrow band across the set.

The decision between the two is rarely either/or. A bettor with two accounts — an exchange for trading and lay bets, a fixed-odds book for the welcome offer and the bet builder — uses each one for what it does best. The Commission’s protection regime covers both, and the customer-protection rules (GAMSTOP, the identity-verification pre-deposit, the financial vulnerability check) apply whichever platform a customer is on.

Worked Margin Example — What the Numbers Look Like

The illustrative example sits on a two-way market at decimal odds 1.90 on each outcome (fractional 9/10, evens in old money plus the bookmaker’s margin). Each outcome’s implied probability is 1 ÷ 1.90 = 0.5263; the two together add to 1.0526. The payout share on a winning bet is 1 ÷ 1.0526 = 0.950, or 95.0 per cent of the stake. The margin is 1 − 0.950 = 0.050, or 5.0 per cent.

The example is the simplest case: a balanced two-way market at even money plus a 5 per cent margin. Real markets run wider or tighter depending on the sport, the platform and the time before the event. A heavily biased football match at 1.20 / 5.00 carries a margin closer to 8 per cent; a one-sided tennis match at the back end of a tournament can carry closer to 3 per cent on the favourite. The band a customer sees on a normal size Premier League match is roughly 3 to 7 per cent on the exchange and roughly 5 to 8 per cent on the fixed-odds books.

On an exchange the commission sits on top. Smarkets’ 2 per cent commission on net winnings reduces the customer’s effective return on a winning market to roughly 0.95 × 0.98 = 0.931, or 93.1 per cent of the stake. The exchange’s headline margin and the commission are two separate numbers, and a customer who reads the headline margin without the commission is missing the line that pays the platform.

A £10 back bet at 1.90 returns £19 if it wins — the stake plus £9 of winnings — on any of the platforms. A £10 lay bet at 1.90 carries £9 of liability, pays £10 if the outcome does not occur, and loses the £9 liability if the outcome does. The numbers on a single bet are the same on an exchange and at a bookmaker; the difference is who takes the other side.

Frequently Asked Questions

How does a betting exchange work?

A betting exchange is a marketplace where two customers take opposite sides of the same event at a price they both agree. One customer backs an outcome at decimal odds of their choice; another customer lays the same outcome at the same price, accepting the role the bookmaker normally plays. The platform matches the two bets and earns commission as a percentage of the customer’s net winnings per market, with losing bets generally carrying no commission. The exchange itself is not a party to the bet.

How does a bookmaker differ from a betting exchange?

A traditional bookmaker takes the other side of the customer’s bet, sets the margin into the odds and pays out of its own pocket when the customer wins. An exchange matches two customers against each other and earns commission on net winnings rather than building an overround into the price. The practical differences are that an exchange lets the customer both back and lay outcomes, that exchange odds tend to be tighter because the overround is smaller, and that the platform’s revenue is the commission line rather than the price difference.

How can it be checked that a bookmaker holds a Gambling Commission licence?

The Gambling Commission’s public register lists every licensed operator and can be searched by business name, trading name, domain or account number. The register is the only place to confirm whether a brand holds a GB licence and which licence category it holds (general betting standard real events, betting intermediary, and so on). Every operator in the ranking above is on the register against the licence number shown.

How is the return on a bet worked out from the stake and the odds?

A back bet pays out at decimal odds multiplied by the stake: return = stake × odds, and the net profit is stake × (odds − 1). A £10 back bet at decimal odds 1.90 returns £19 — the £10 stake plus £9 of profit. A combination bet multiplies the odds of the legs into one price: a double at 1.90 / 1.90 carries combined odds of 3.61 and pays £36.10 on a £10 stake. The numbers are the same on an exchange and at a fixed-odds bookmaker; the difference is the commission an exchange takes on the winnings.

What is the bookmaker’s margin and how can it be seen in the odds?

The margin is the percentage of every unit staked that the platform keeps on average. A two-way market at decimal odds of 1.90 on each outcome has implied probabilities that add to 1.0526, so the payout share on a winning bet is 1 ÷ 1.0526 = 95.0 per cent and the margin is 5.0 per cent. The narrower the margin, the tighter the price. On an exchange the commission is a separate line, sitting on top of the headline margin rather than inside it; on a fixed-odds book the margin is the whole take.

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