Definition
A bookmaker (or sportsbook) is an operator that accepts bets on the outcomes of sporting events and other markets, sets the odds, and pays out winning bets. Its business model is built into the odds: across a market, the implied probabilities sum to more than 100%, and that excess — the overround or margin — is the bookmaker's expected gross profit if it balances its liabilities across outcomes.
Modern bookmakers offer pre-match and in-play (live) betting across many sports, plus markets on politics, entertainment and novelty events, and products like accumulators, cash-out, bet builders and request-a-bet. Behind the front end sit risk management (adjusting odds and limits as money comes in), trading (often powered by a data and odds supplier), payments, and compliance with the licensing regime of each market served.
In context
For affiliates, sportsbook traffic behaves differently from casino traffic. Bettors often have a strong existing interest (a team, a sport, a matchday), so intent-driven content — previews, odds comparison, tipster analysis, market explainers — converts well, and traffic is seasonal, spiking around major tournaments and fixtures.
Player value is generally lower and more volatile than casino, so RevShare depends heavily on the bookmaker's margin discipline and on whether it limits or closes winning accounts, which affects both player retention and the affiliate's long-run commission.
The practical evaluation points for an affiliate choosing a bookmaker to promote are: which markets it is licensed for; its odds competitiveness (a sportsbook with consistently poor prices retains bettors badly); its live-betting product and app quality; its payment coverage and withdrawal speed by GEO; whether it aggressively limits sharp customers (which shortens player lifetimes); and its affiliate terms, negative-carryover treatment and reporting transparency. Bookmaker branded search is also worth checking, since "[bookmaker] withdrawal" and "[bookmaker] limited my account" are common pre-signup queries.
Worked example
A tipster affiliate promotes two bookmakers. One offers top-three prices on most markets and rarely limits accounts; the other has weak odds and closes winning bettors within weeks.
The first retains referred players for months on RevShare; the second's cohort collapses after the first losing run, so the affiliate features the first prominently and drops the second.
Related terms
Frequently asked questions
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