Best betting exchange sites — what the ten licensed ones actually cost

Updated October 2026

Licensed

Available in US

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18+ Only

A betting exchange is a marketplace, not a bookmaker. Customers back an outcome or lay it, and the platform sits between them as intermediary, taking a slice of net winnings as commission instead of building a margin into every price. That single change to who pays whom is the reason exchange odds are usually better, the reason the same site can offer both sides of a market at the same time, and the reason the regulatory question is its own category. In Great Britain a betting exchange needs a remote betting intermediary licence from the Gambling Commission, on top of the remote general betting standard (real events) licence most operators also hold; the Commission’s public register is the test of who holds what, and the brands in this guide are the ten whose licence could be checked there on 30 October 2026.

The angle here is cost — not the marketing word “free” but what a back bet, a lay bet and a platform’s commission actually leave in the punter’s pocket. The page is built around the move from back-and-lay to commission, because that is where most of the £-for-£ difference between an exchange and a bookmaker lives. The marketing line on every exchange is “better odds”; the arithmetic shows why.

Licence status as of 30 October 2026 verified against the Gambling Commission’s public register.

Crypto and anonymity at a betting exchange

Crypto does not buy anonymity at a betting exchange in Great Britain. Since 7 May 2019 every operator licensed by the Commission has to verify name, address and date of birth before a customer can deposit or gamble, and that verification is a licence condition rather than a check the operator chooses to run. The verification has to be passed even to claim a free bet or bonus, which means no licensed exchange takes anonymous crypto deposits, no matter what the marketing page says about Bitcoin.

The unlicensed route exists — Curaçao-licensed sites, blockchain-only exchanges that match wallets instead of accounts — and it does what the marketing says, but it does so without GAMSTOP, without the Commission’s complaints route, and without a British consumer-rights fallback if funds are withheld. The Commission’s own position, set out in its public statements, is that enforcement happens through disruption (cease-and-desist notices, search-engine referrals, registrar and payment-provider work, with court-order DNS blocking powers in train) rather than ISP blocking. The honest framing is that the protection is gone with the licence, and the £ saved on verification is the same £ the reader cannot recover from a dispute that goes wrong. A reader choosing crypto at an unlicensed exchange is choosing speed and pseudonymity against redress, not choosing a cheaper bet.

For readers inside the licensed set the practical question is the narrower one of which methods each exchange accepts. Smarkets, Betfair and Matchbook each publish their own payments page; the page-by-page check is what tells the reader whether a debit card, a bank transfer or a particular e-wallet is the route that works at the platform they want to use. Crypto does not change the maths of a back bet or a lay bet — it only changes who holds the wallet between the punter and the exchange.

Bonuses and free bets at exchanges

Bonuses at exchanges look like bonuses at bookmakers and behave like nothing of the sort. An exchange earns its revenue from commission on net winnings, not from a margin baked into the price, so the offers tend to be flatter: commission rebates for new customers, sometimes 0% commission for a fixed period, occasional price boosts on headline markets. The free bet as a category exists at some platforms because they run both an exchange and a sportsbook, and the free bet is the sportsbook’s offer rather than the exchange’s.

The Commission has capped wagering requirements on bonuses at 10x since 19 January 2026: a £10 bonus at 50x needed £500 of qualifying bets before withdrawal, and under the cap no more than £100 of qualifying bets is needed. Mixed-product promotions — an offer that requires gambling on two or more product types, the “bet on football to get free spins” pattern — are banned. The cap applies to bonuses; the Commission’s public statements leave open whether the cap reaches free bets with no wagering condition, so a reader who is being offered “£30 in free bets, no rollover” should read that in the offer’s own terms rather than assume the cap disarms the offer. The Commission’s own position is that the cap is on the wagering requirement, not on the monetary value of the bonus.

The smarter way to read an exchange offer is to ask what the offer changes at settlement. A 0% commission for 60 days on net winnings of, say, £400 saves £8 at Smarkets’ standard 2% rate; a £30 free bet at a sportsbook saves less, because the stake is usually not paid back with a win. The £30 free bet that returns £30 plus winnings is worth £30; the £30 free bet whose stake is forfeit is worth less. The same arithmetic applies to a price boost: the boost is on the displayed price, but the lay side of the same market at the exchange may already be at a better number once commission is taken off. That is the calculation the rest of this page is built around.

Mobile apps and browser betting

The mobile exchange has caught up with the desktop one. Betfair, Smarkets and Matchbook each ship a native iOS and Android app, and each carries the same core product as the desktop site: back and lay, in-play markets where the operator offers them, cash out on selections the platform supports, and (where the licence covers it) live streaming of horse racing, greyhounds and football. The browser version sits behind the same login, so the cash balance, the open positions and the commission tier travel between handset and desktop without a separate account.

The question for the reader is which features they actually need on the handset. In-play betting wants a fast price refresh and a one-tap lay, because the price moves in seconds and a punt confirmed at the wrong second is a punt at a worse number than the one on the screen. Cash out on the handset is a separate decision from cash out on the desktop, because the cash-out figure the platform offers is its own price, and the reader can sometimes lay the same selection on the exchange for a better number. Bet Builder and same-game multiples are sportsbook products rather than exchange products, and they live in the app of any platform that runs both rather than in the exchange interface itself.

The age-rating detail on the App Store (17+ for some apps, 12+ for others) is the platform’s own age-gate classification rather than the legal minimum for betting in Great Britain, which is 18. The verification at sign-up is what enforces 18; the App Store rating is what enforces the store’s own rules.

Live betting and cash out at exchanges

Live betting on an exchange is structurally different from live betting on a sportsbook. A sportsbook runs an internal price on each in-play market and updates it from its own model; an exchange matches back and lay bets between customers, so the price moves with what other punters are willing to offer. The advantage is the price is usually closer to fair than the sportsbook’s; the disadvantage is liquidity thins out on smaller markets, and a £1,000 back bet at the right price can take several minutes to fill.

Cash out is the platform’s offer to settle a position before the event settles, at a price the platform sets from the live market. The platform’s own help pages make the point plain: cash out is not guaranteed, and bets stand if cash out is unavailable. The platform has no obligation to offer cash out, and the cash-out figure it does offer is its own price rather than the mid-price on the exchange. A reader who wants the best cash-out price is a reader who lays the same selection on the exchange rather than pressing cash out on the sportsbook, and that is the structural reason exchanges and sportsbooks co-exist on the same platform.

Live streaming is a separate product from in-play betting, and the licences differ. Betfair streams UK and Irish horse racing and selected football within its app; Matchbook streams horse racing and greyhounds. Streaming does not change the price; it changes whether the reader can react to what is on the pitch faster than the price moves. A reader who bets in-play without streaming is a reader betting on a ticker rather than on the game.

Predictions, systems and bankroll strategy at an exchange

A prediction is not a system. Tips from tipsters, models from quants and “form” reading from journalists are all inputs to a betting decision, and none of them changes the arithmetic on the back side of a bet: a back bet at 3.00 returns three times the stake if it wins and zero if it loses, regardless of how confident the tipster sounded. The system the exchange unlocks is the lay bet, because a lay bet is a position the bookmaker model cannot offer: the punter becomes the bookmaker, quoting a price and taking the other side when someone backs it.

The honest framing of a “betting exchange system” is that the system is a bankroll rule, not a tip. Staking a fixed unit per cent of bank, walking away at a stop-loss, keeping a record of closing-line value (the price at kick-off rather than the price at bet-placement), and refusing to chase losses are the four rules that survive contact with the maths. The trading strategy material — scalping a price move, “trading” a horse race in-running — is a separate craft with its own literature, and a reader who wants to learn it should expect to lose money while they do. The exchange gives them the venue; it does not give them an edge.

A useful diagnostic is whether the reader can state their edge before they place the bet, in basis points of the price. A reader who can say “this is a 55% chance at decimal odds 2.00, the market says 50%” has a tradable view; a reader who says “I fancy this one” has a view and a loss waiting to happen. The exchange is a venue for the first reader and a faster way to lose money for the second.

Bet types, odds and settlement

The bet types at a betting exchange are the same as the bet types at a bookmaker — single, double, treble, accumulator (acca), each-way — with one addition: the lay bet, which is the same shape as the bookmaker’s quote rather than a separate product. An each-way bet is two bets of equal stake, so the stake doubles, and the place terms vary by race and operator. A Lucky 15 is fifteen bets on four selections; a Goliath is two hundred and forty-seven. The total stake on a multiple is the unit stake multiplied by the number of bets, and a £1 Lucky 15 costs £15.

The odds on an exchange are decimal in the app and the browser, with the fractional form (£5 unit at 5/1 returns £30 in profit) shown beside it as a display preference. Conversion is a/b → a ÷ b + 1, so 5/1 → 6.00 and 11/4 → 3.75. Evens is 1/1 → 2.00. “Odds-on” is shorter than evens; “odds-against” is longer. Odds are limited to between 1.01 and 1000 at most exchanges, and bet sizes are not restricted as long as opposing customers match the stake — which is why a £10,000 lay bet at 1.01 can be placed and never filled, and why a £10 lay at 1000 sits there until someone takes the other side.

Settlement follows the platform’s rules and the sport’s governing body. A non-runner in horse racing triggers the Rule 4 deduction at the bookmaker, and the exchange applies its own version of the same logic. Best Odds Guaranteed (BOG) is a bookmaker rule that pays the starting price if the SP is bigger than the price taken; on an exchange, the price is the price, and BOG is a sportsbook concession rather than an exchange feature. The reader should expect to see BOG at the sportsbook of any platform that runs both, and not at the exchange side of the same platform.

The ten licensed betting exchange and exchange-adjacent sites

Ten platforms hold a Gambling Commission remote licence that covers betting exchange activity or betting intermediary status as of 30 October 2026. The list is alphabetical by trading name, not a ranking, and each platform gets its own short read. The Gambling Commission’s public register is the test of who holds what; the licence numbers below are what a reader can search there. Every operator on the list takes part in GAMSTOP.

Betfair

Betfair is the longest-running exchange serving Great Britain, the venue the rest of the market benchmarks itself against, and the only platform on this list that runs a full sportsbook alongside the exchange. The sportsbook side offers in-play betting, Bet Builder, free live streaming of UK and Irish horse racing and football within the app, and a 90 Minute Payout market that settles on the 90-minute result regardless of extra time or penalties. The exchange side is where the back-and-lay market lives, with the platform matching customers and taking commission on net winnings.

The licence (Commission account 39439) sits with PPB Counterparty Services Limited, which is the same Flutter-owned entity that holds the licence for Paddy Power — a reminder that several trading names can run under one licensee, and that the licence holder is the regulated entity rather than the brand on the front of the app. The Flutter parent group merged with Betfair in 2001, and the group is the licence holder behind Betfair and Paddy Power.

The platform gives the reader deep in-play liquidity on UK football and horse racing, the Bet Builder product from the sportsbook side, and a single account that carries the exchange and the sportsbook. The cost is commission on net winnings at the exchange tier the reader is on, and the standard sportsbook margin baked into prices at the sportsbook side. For a reader who only wants the exchange, the depth of liquidity is the reason to pick Betfair over a smaller platform.

Bet600

Bet600 is a sportsbook rather than an exchange, and the platform earns its place on this list for the horse-racing concession it puts in its own terms: Best Odds Guaranteed on horse racing, with the bet paid at the starting price if the SP is bigger than the early or show price taken. BOG is a bookmaker rule rather than an exchange feature, and Bet600 applies it across its horse-racing markets, which is the category where BOG does the most work for the punter.

The licence (Commission account 44731) sits with Tyche Tech Limited, and the platform is the right venue for a reader whose betting is concentrated on UK and Irish horse racing and who wants the BOG concession taken off the price they see on the race card. The platform is not an exchange, and there is no lay side of any market on Bet600. A reader looking for back-and-lay needs a different platform.

BetTom

BetTom is a sportsbook, not an exchange, and the welcome offer in its own terms is 50% back as a free bet up to £50, with a matching 50% back up to £50 as free slot funds for casino. The “matching” half is the mixed-product shape that the Commission’s rules have restricted: an offer that requires gambling on two or more product types is banned in the post-19-January-2026 framework, and a reader who wants to claim the casino half has to play casino rather than bet on sport. The platform’s own terms carry the detail; the headline number is the headline number.

The licence (Commission account 64959) sits with Bet Tom Limited. Readers looking for a sports welcome offer on the sportsbook side and comfortable with a casino add-on might consider this. The 10x wagering cap on bonuses (in force since 19 January 2026) sits over any bonus, and the reader should check the qualifying bets and the minimum odds in the platform’s own terms before claiming. The free bet, like most sportsbook free bets, pays winnings without paying the stake back, so a £50 free bet at 3.00 returns £100, not £150.

DAZN Bet

DAZN Bet is a sportsbook with Cash Out, Bet Builder, daily bet boosts and in-play betting. The platform’s own help pages put the cash-out caveat in plain terms: cash out availability is not guaranteed and bets stand if it is unavailable. That caveat matters because “cash out” reads to a reader as a settled position and behaves in practice as an offer the platform can withdraw, particularly during the in-play minutes when the price is moving fastest.

The licence (Commission account 48756) sits with DZBT Limited. The platform is not an exchange — there is no lay side of any market — and the reader looking for back-and-lay needs a different platform. The right read on DAZN Bet is as a sportsbook with strong in-play coverage and a Bet Builder, with the cash-out caveat in the help pages being the reason a reader who wants guaranteed exit should consider laying the selection on an exchange rather than pressing cash out.

Fafabet

Fafabet’s headline concession is Best Odds Guaranteed on UK and Irish horse racing win and each-way bets from 9am on race days: if the starting price is bigger than the original price, the bigger odds are paid. The 9am trigger matters because the BOG window opens at 9am rather than at the off, and a bet struck before 9am is on the price the punter took.

The licence (Commission account 57385) sits with Taichi Tech Limited. Fafabet is a sportsbook, not an exchange, and a reader looking for back-and-lay needs a different platform. For a reader betting on UK and Irish racing who wants BOG taken off the morning price, this is a solid choice.

Matchbook

Matchbook is a betting exchange where customers bet against other users, with Bet Builder, multiples, in-play betting and live streaming of horse racing and greyhounds. The platform’s pitch is the same shape as Betfair’s: a back-and-lay market with commission on net winnings, plus a sportsbook product attached for the bet types the exchange does not cover. The streaming of horse racing and greyhounds is a meaningful concession for in-play betting on those two sports, where the visual feed lets the punter react to the running rather than to the ticker.

The licence (Commission account 39504) sits with Triplebet Limited, and the platform is registered as a remote betting intermediary plus a remote general betting standard (real events) operator. An exchange with in-play markets and Bet Builder that also provides live streaming of racing is a strong contender for the punter’s attention.

Midnite

Midnite’s sports welcome offer is the headline that catches the eye: new customers who bet £5 or more on pre-match odds of EVS (2.0) or greater within 14 days of sign-up receive £25 in free bets and 50 free spins, valid for 7 days. The qualifying bet is a single £5 at 2.0 or longer, and the free bets are valid for 7 days once issued. The platform’s site cites Gambling Commission licence 101839 and shows in-play events, an acca builder, popular accas and price boosts with maximum-stake limits.

The licence (Commission account 101839) sits with Midnite Limited. The platform is a sportsbook rather than an exchange, and there is no lay side of any market. For a reader who wants the welcome-offer shape (£5 at EVS or longer for £25 in free bets) and is comfortable with a sportsbook, this is worth a look. The free spins are a casino product, and the mixed-product concern that applies to “bet on football to get free spins” offers does not apply to a welcome offer where the qualifying bet is on sport and the free spins are a bonus on their own.

Smarkets

Smarkets is a betting exchange, and the headline figure in its own terms is the commission: 2% on eligible exchange bets as standard, with new customers offered 0% commission for 60 days on a minimum first deposit of £10. The 0% period is the offer that does the work, because commission at 2% on net winnings is the same shape as the bookmaker’s margin: a £100 profit at 2% commission returns £98 to the punter. The 0% period removes that £2 for sixty days, which is the period in which the offer is worth taking.

The licence (Commission account 39173) sits with Smarkets (Malta) Limited, and the platform is registered as a remote betting intermediary. The right pick for a reader who wants an exchange product at a lower headline commission than the market’s bigger venues, with the 0%-for-60-days welcome offer as the lever on the £-for-£ difference. The platform’s liquidity is shallower than Betfair’s on the biggest football and horse-racing markets, which is the structural trade-off a reader choosing Smarkets is making.

Star Sports

Star Sports is a sportsbook with pre-event and in-play markets, Bet Boosts, Daily Specials and Weekend Enhanced Boosts, plus in-play betting on football, horse racing, golf and US sports. The boosts are the headline concession, and the in-play coverage of US sports is the niche pick: a reader betting on NFL, NBA or MLB has a venue with in-play markets and price boosts on the same site.

The licence (Commission account 9177) sits with Star Racing Limited. The platform is a sportsbook, not an exchange, and a reader wanting back-and-lay needs a different platform. For a reader focused on US sports and UK football, the price boosts offer a competitive edge on the headline markets.

Kalooki Sportsbook

Kalooki Sportsbook is operated by Kalooki Sports Book Ltd (company number 12938274), licensed by the Gambling Commission under account number 57730, and is a GAMSTOP member. The headline offer on the platform is a sportsbook rather than an exchange, and the platform earns its place on this list as one of the smaller licensed sportsbooks that meets the verification, GAMSTOP and source-of-funds requirements of the Commission’s framework.

The licence (Commission account 57730) sits with Kalooki Sportsbook Limited. The right pick for a reader who wants a smaller-platform sportsbook that meets the Commission’s licence conditions, with the caveat that depth of market and in-play coverage at a smaller platform is not the same as at a larger one.

The landscape of betting exchanges in Great Britain

The licensed market for exchanges in Great Britain is small. Three platforms — Betfair, Smarkets and Matchbook — hold a remote betting intermediary licence from the Commission and run exchange products at scale. The other seven platforms on this list are sportsbooks that meet the Commission’s licence conditions and earn their place for the welcome offer, the in-play coverage, the BOG concession or the price boosts, rather than for running a back-and-lay market.

The distinction matters because the cost calculation is different at each. An exchange charges commission on net winnings (Smarkets at 2% standard, the other two at their own tiered rates) and earns nothing from the price; a sportsbook builds a margin into every price and earns its revenue from the difference between what the punter backs and what the selection is worth. The exchange price is usually closer to fair because there is no margin; the sportsbook price is worse for the same reason. The trade-off is liquidity. An exchange can be empty on a particular price at a particular second, and a £1,000 back bet at 3.00 can take several minutes to fill at the right number; a sportsbook takes the same bet at its own price in a second.

The market’s own consolidation has been steady for a decade, and the question for the reader is whether the depth of Betfair’s liquidity, the commission at Smarkets, or the sportsbook-with-exchange attached at Matchbook is the trade-off they want to make.

Legality and regulation

The Gambling Act 2005 is the statute, and the Gambling Commission is the regulator. The Act covers England, Scotland and Wales (Great Britain); Northern Ireland is outside the Act and has its own older law, so a “GB-licensed” brand is licensed for the three nations and not for Northern Ireland. Since the Gambling (Licensing and Advertising) Act 2014 an operator whose remote facilities are used in Great Britain needs a Commission licence wherever it is based — sections 33 and 36 of the 2005 Act as amended. A Curaçao, Maltese or Gibraltar licence is not a substitute.

The licence types that matter for this page are remote general betting standard (real events) for sportsbooks, remote betting intermediary for exchanges, and the related categories (remote general betting standard (virtual events), remote general betting limited, remote pool betting). The Commission’s public register can be searched by business name, trading name, domain or account number, and is the test of who holds a licence; a print of a single licence number is a check the reader can do at the Commission’s site. The licence numbers in the table above are what the reader can search there.

Financial spread betting is regulated by the Financial Conduct Authority, not the Commission. Spreadex is the platform that runs both FCA-regulated spread betting and Gambling Commission-regulated fixed-odds betting, and the platform states on its homepage that spread betting losses can exceed the deposit. The dual regulation is the reason the platform’s spread-betting product carries a different risk warning from its fixed-odds product.

What may be bet on is set by the operator’s licence and the Commission’s Licence Conditions and Codes of Practice (LCCP), not by a statutory list of permitted markets. In-play betting is offered by GB bookmakers under their own licence conditions and customer-protection duties; esports are treated like any other event; virtual events are a separate licence category; bets on politics, TV shows and novelty markets are offered by GB bookmakers without a statutory prohibition the Commission’s own statements have named. There is no statutory cap on stakes in sports betting: operators set their own maximum stakes and may restrict customers.

The age minimum is 18, and name, address and date of birth are verified before the customer can deposit or gamble (since 7 May 2019), including with a free bet or bonus. The verification is the reason no licensed exchange accepts anonymous deposits. Identity verification before the first deposit means no anonymous play at a licensed site, and source-of-funds questions at higher spend are normal under the money-laundering rules.

Advertising runs through the CAP Code (non-broadcast) and BCAP Code (broadcast), enforced by the ASA, alongside the LCCP marketing conditions. CAP Code section 16 sets the rule that marketing must be socially responsible, must not be of strong appeal to under-18s, and no one who is or seems to be under 25 may be featured gambling or play a significant role (with an exception for marketing placed where a bet can be made directly). That rule concerns who may appear in the advertisement, not who may bet.

The Commission has capped wagering requirements on bonuses at 10x since 19 January 2026, and banned mixed-product promotions in the same package. “Whistle-to-whistle” is an industry code, not law: since 1 August 2019 betting advertisements are not shown on TV from five minutes before a live sporting event to five minutes after it, before the 9pm watershed (horse and greyhound racing excluded). The Premier League clubs’ withdrawal of gambling sponsorship from the front of matchday shirts (from 2026/27; sleeves and hoardings remain) is voluntary, not law.

The player pays no tax on betting winnings in Great Britain (general information, not tax advice; a professional gambler should ask HMRC or an adviser). General Betting Duty is the operator’s tax on gross profits, currently 15%; from 1 April 2027 a new remote betting rate of 25% applies within it, while remote bets on UK horse racing, bets on self-service betting terminals in licensed premises, pool betting and in-person betting stay at 15% (HM Government policy paper of 26 November 2025). Spread betting has its own rates (3% financial, 10% other). Until 1 April 2027 the remote rate stays at 15%; whether operators pass duty on through odds is not established.

Offshore is a different category. Providing gambling facilities in Great Britain without the licence the Act requires is an offence under section 33 of the Gambling Act 2005 — on summary conviction up to 51 weeks’ imprisonment, a fine up to level 5, or both; six months in Scotland. The offence is aimed at the operator, not the customer who merely bets on an unlicensed site. The loss of protection is the practical cost: no GAMSTOP coverage, no Commission complaints route, no approved dispute-resolution body, no British consumer redress if funds are withheld, and not bound by the 10x bonus cap or the £150 vulnerability check.

Responsible gambling

The Commission’s safer-gambling framework sits over every licensed platform on this list. GAMSTOP is the national multi-operator online self-exclusion scheme, and it is a mandatory licence condition for online operators since 31 March 2020. The periods are six months, one year, five years, or five years with auto-renewal, and after the minimum period the exclusion stays in place for a further seven years unless the customer asks GAMSTOP to remove it. GAMSTOP covers online sites and apps; betting shops use a separate service.

The financial vulnerability check (LCCP condition 3.4.4, in force since 30 August 2024) applies to licensed remote betting when a customer’s deposits minus withdrawals exceed £150 in a rolling 30 days (since 28 February 2025). The check is a public-record check (for example bankruptcy or county court judgments), not an income check and not a credit reference check. Financial risk assessments (the “affordability checks” of the press) are announced in a staged plan (Commission article of 7 July 2026), with no start date — the Commission’s own position is that the plan is staged and a start date has not been set. Deposit limits (RTS 12) require operators to offer a gross deposit limit on a fixed time frame; the first changes have applied since 31 October 2025, a second phase was postponed to 30 September 2026, and whether the second phase is live is not established. There is no state-set deposit or loss ceiling for betting: limits are the customer’s choice.

The help line is GamCare’s National Gambling Helpline, and the wider network is GambleAware, NHS gambling clinics and Gamblers Anonymous. Each platform on this list runs GAMSTOP, runs age verification at sign-up, runs the £150 vulnerability check at the trigger, and points to one of the help organisations in its safer-gambling pages. The protection is the reason the licensed set exists; the cost of the verification is the trade-off a reader choosing an unlicensed platform is making.

What the margin on a £10 at 1.90 actually looks like

A two-way market at decimal odds 1.90 / 1.90 is the example that shows how the exchange’s edge stacks up against the bookmaker’s. The payout share is 1 ÷ (1/1.90 + 1/1.90) = 1 ÷ (0.5263 + 0.5263) = 1 ÷ 1.0526 = 0.9500, which is 95.00%. The margin is 1 − 0.9500 = 0.0500, which is 5.00%. A £10 stake at 1.90 returns £19.00 if it wins, with a net profit of £9.00. Across a balanced book on the market, the platform keeps 5p of every £10 staked on the two outcomes.

That margin of 5% is what the bookmaker keeps, in the round. The exchange keeps its commission on net winnings instead, and the same £10 stake at 1.90 at an exchange with 2% commission returns £19.00 minus £0.18 of commission on the £9.00 profit, which is £18.82. The exchange is cheaper for the winning punter by 18p on this stake at this price, and the bookmaker is cheaper for the platform by 32p on the same stake because the bookmaker’s 5% margin is taken off both sides before settlement. The exchange’s price is closer to fair, and the exchange’s revenue is taken after the bet rather than before it.

The 5% margin is illustrative rather than a quoted price — the read on a specific market is the bookmaker’s own margin on that market at that snapshot, and a margin of 2% on a deep in-play football market at Betfair is not the same as a margin of 8% on a smaller-market horse race at a sportsbook. The lesson holds at every margin: the exchange price minus commission is what the punter keeps, and the bookmaker price minus the margin is what the punter keeps, and the difference is the structural reason the exchange is the venue the smart money uses for the markets where it has liquidity.

Frequently asked questions

What is a betting exchange and how does it differ from a bookmaker?

A betting exchange is a marketplace where customers back and lay outcomes against each other; the platform takes a commission on net winnings rather than building a margin into every price. A bookmaker runs its own book and earns its revenue from less favourable prices, so exchange odds are usually better and exchange liquidity is shallower on smaller markets. In Great Britain an exchange needs a remote betting intermediary licence from the Gambling Commission.

How do I check that a bookmaker holds a Gambling Commission licence?

The Commission’s public register can be searched by business name, trading name, domain or account number at the Commission’s website, and is the test of who holds a licence. The licence numbers in the table above are what a reader can search there, and the access date is what makes the check current. A single licence number does not prove every brand on a corporate group is licensed; the licence holder is the entity named on the register entry.

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

Return is stake multiplied by decimal odds; net profit is stake multiplied by (odds minus 1). A £10 stake at 3.00 returns £30, with net profit of £20. A combination bet multiplies the odds of the legs together, so a £10 double at 3.00 and 4.00 returns £120 with net profit of £110 if both legs win, and zero if either leg loses. Each-way doubles the stake because it is two bets of equal stake on the same selection.

What is the bookmaker’s margin and how does it show in the odds?

The margin is the share of every unit staked the bookmaker keeps across a market, and it shows in the overround of the prices. Payout share is 1 divided by the sum of 1/odds across all outcomes; margin is 1 minus that share. A two-way market at 1.90 / 1.90 has a payout share of 95.00% and a margin of 5.00%; the same market at 1.80 / 1.80 has a payout share of about 90.09% and a margin of about 9.91%. Smaller margins mean better prices for the punter.

What is the difference between a back bet and a lay bet?

A back bet wagers that an outcome will occur; a lay bet wagers that it will not. Liability on a lay bet is the most the layer can lose in the worst case, which is stake multiplied by (odds minus 1), and the layer’s profit is the backer’s stake if the outcome does not occur. The layer takes the role a bookmaker plays, which is why a lay bet is the structural tool that lets a punter quote a price on a market rather than take one.

How does commission at an exchange compare to a bookmaker’s margin?

An exchange charges commission on net winnings, usually as a percentage of profit per market; a bookmaker builds a margin into every price. A 5% bookmaker margin on a two-way market at 1.90 / 1.90 is the same shape as 5% commission on net winnings at the same prices, but the commission is paid only by winners, while the margin is taken from every stake regardless of outcome. The exchange price minus commission is usually better than the bookmaker price minus margin for winning punters on markets with sufficient liquidity.

What should I read in an exchange’s terms before I open an account?

The commission tier (Smarkets at 2% standard, Betfair and Matchbook at their own tiered rates), the welcome offer and its qualifying bets, the minimum odds on qualifying bets, the in-play markets and any maximum-stake limits on price boosts, and the platform’s own rules on cash out, Rule 4 deductions and non-runners. The Commission’s 10x cap on bonus wagering applies since 19 January 2026, and a mixed-product offer is restricted under the same package.

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