The best betting exchanges are a short list. An exchange is a betting site where you bet against other customers instead of against the house. The exchange matches the two sides and takes a commission on winnings.
Exchanges suit bettors who already understand ordinary betting and want better prices, the option to lay (bet against an outcome), or the freedom to win without having stakes cut. If you’re brand new, start with a regular licensed bookmaker and the guide to how betting odds work.
There are only four names, because there are only a few real exchanges. Betfair is the biggest by liquidity, meaning the amount of money waiting to be matched. Smarkets has a clean interface and low commission. Matchbook aims at more serious bettors. Betdaq is the long-time number two for UK and Irish racing. The downsides: commission on winnings, and thin markets on smaller leagues where your bet may simply not get matched.
All four hold UK Gambling Commission licences according to their listings, which are still being verified by hand. Confirm any licence on the regulator’s own register before you deposit. Scores follow the review methodology. I haven’t reviewed any exchange hands-on, so they’re provisional.
The glossary explains what a betting exchange is and what a lay bet is in more detail. If you plan to trade, the exchange software on the betting tools and software page is what regulars use.
Laying can lose you more than your stake suggests. 18+ only, and the responsible gambling page has free help lines if you need them.