Guide
Betting arbitrage: how it works and what the risks are
8 min read · updated on
Arbitrage (a surebet) means covering every outcome of a match at different bookmakers, exploiting drifted prices to lock in a theoretical margin. It sounds like easy money — which is exactly why it deserves a full chapter on risk.
When arbitrage exists
Add the inverse of the best odds for each outcome (1/odds). If the total is below 1, there's margin: for example, 1/2.10 + 1/3.80 + 1/4.50 = 0.962 → roughly a 3.9% theoretical margin.
Our system checks this continuously across the day's matches and shows the required legs: outcome, bookmaker and odds of each bet.
How the stake is split
The total amount is distributed proportionally to 1/odds of each leg, so the return is identical whatever the outcome. Arbitrage calculators do this automatically.
What can go wrong
The margin is theoretical and fragile. Practical risks include:
- Odds move between your first and last bet — the surebet vanishes or inverts.
- Bookmakers void bets on palpable pricing errors, leaving your coverage lopsided.
- Stake limits stop you from placing the calculated amounts.
- Accounts that systematically bet surebets get limited or closed.
- Deposit/withdrawal fees eat into small margins.
Frequently asked questions
- Is arbitrage legal?
- Betting at licensed bookmakers is legal. Arbitrage isn't a crime, but it violates some operators' terms of use, and they may limit your account.
- What margin is worth it?
- Margins below 1–2% rarely compensate for execution risk and costs. Bigger surebets exist, but they last minutes.