Definition
Arbitrage betting, or arbing, is placing bets on all outcomes of an event across different bookmakers whose prices, taken together, imply a total probability below 100%, so that whichever outcome occurs the bettor makes a small guaranteed profit. It exists because different books price the same event slightly differently and are sometimes slow to move a line; arbers use software to scan many operators for these transient discrepancies and act fast before the prices correct.
Like matched betting it does not depend on predicting results, is legal, and is not fraud — but it is strongly against bookmaker interests. Books identify arbers through betting patterns (round-number stakes on obscure lines, betting near-simultaneously across operators, no natural losing bets) and respond with aggressive stake factoring and account limits.
Margins per arb are thin, opportunities are short-lived, and mistakes (a price moving before the second leg is placed, a bet voided) can turn a locked profit into a loss.
In context
For affiliates, arbing is a content topic (arb-finding software reviews, explainer guides) and, like matched betting, a source of friction with operators. Accurate content explains that arbitrage is real and legal but not risk-free (execution risk, voided bets, currency and fee drag, funds spread across many accounts) and not durable (books limit arbers quickly, so the accessible edge shrinks as accounts are restricted).
It should not present arbing as easy or guaranteed long-term income.
The operator-relationship point is the same as for matched betting: an arber is a negative-value customer to a bookmaker — they never lose naturally and their activity is pure cost — so affiliate traffic sent with arbing intent will have commissions clawed back as abuse, deals cut, or accounts closed, and operators screen for affiliate cohorts that behave this way. Content should carry responsible-gambling messaging, and should be clear that scanning software, multiple funded accounts, and fast execution are required and that the realistic outcome for most people who try it is limited accounts and thin returns rather than reliable profit.
For affiliate-facing content, the framing is that arbing is legitimate but bookmaker-unwelcome, that it is neither easy nor durable, and that directing arbitrage traffic into operator programmes is treated as abuse and undermines the affiliate relationship.
Worked example
An affiliate's arbing explainer describes scanning for sub-100% price combinations across books, then states plainly that it is legal but strongly against bookmaker terms, that arbers are limited fast, that execution errors and voided legs cause real losses, and that it is not durable income. The affiliate does not route arbing-intent traffic to operator programmes.
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