How liquidity works
Every price on an exchange is offered by another user. The 'available' figure is how much money you can lay at that price before it moves. Major football and horse racing markets have thousands of pounds available at each price; obscure markets may have only £50.
Always check available lay volume before placing the corresponding bookmaker bet. If the exchange has £40 available at 3.0 and you need to lay £60, you'll take part of your stake at 3.0 and part at the next available price (usually 3.05 or 3.1).
Liability and settlement
When you lay a selection the exchange holds your liability — the payout you'd owe if the lay lost. It's returned automatically once the market settles.
Commission is deducted from your net winnings on each market (typically 2% on Smarkets and Matchbook, up to 5% on Betfair depending on your rate). Commission is only ever charged on wins, never on losses.
Which exchange to use
Smarkets — cleanest interface, competitive 2% commission across most markets. Best starting point for beginners.
Betfair — deepest liquidity, especially on horse racing and less-common markets. Standard commission is 5% but reduces with usage; Betfair also runs the Betfair Sportsbook (the traditional bookmaker side) which is separate from the exchange.
Matchbook — flat 2% commission on major markets, but liquidity outside football/racing is thinner.
Most matched bettors run Smarkets for football and Betfair for horse racing.
Depositing and withdrawing
Deposits from a UK debit card are instant. Withdrawals typically clear within 24 hours to the same card. Exchange balances are held in segregated client accounts, ring-fenced from the exchange's own operating funds — a UKGC licence requirement.
Move profit off the exchange to your bank account monthly. Leaving large balances on the exchange is fine but psychologically encourages casual betting.
Kelly's tips
- ✦Withdraw exchange winnings to a separate bank account monthly. It stops profits leaking back into casual bets.
- ✦Fund the exchange with at least 2× the size of the largest offer you'll qualify. Liability adds up faster than beginners expect.
- ✦Set up two-factor authentication on every exchange account. Balances can be four-figure numbers within weeks.
Common mistakes
- ✕Laying without checking liquidity — the price can move before your bet fills.
- ✕Confusing back and lay stakes when entering the amount. Always double-check the field.
- ✕Placing lays after the event has started when the price is volatile.
- ✕Assuming the exchange's price is 'the true price' — it's just the current market. Bookmaker bias can be a genuine +EV signal to trade on.
FAQs
Can I use one exchange for every bet?
Yes. Beginners usually stick to one exchange for a year.
Are exchanges regulated?
Yes — Smarkets, Betfair and Matchbook are all UKGC-licensed and covered by the same regulatory framework as any UK bookmaker.
Do exchanges gub accounts?
No. Exchanges take a commission on every winning bet, so they welcome high-volume users. Only bookmakers restrict accounts.
What if the market is voided?
Both your back and lay bets are cancelled and stakes returned. No qualifying loss, no free bet.
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