Authoritative, editor-verified definitions of every casino bonus, sports betting, and statistical term — from RTP and Wagering Requirements to Poisson Regression and Expected Value. Each entry is enriched with formulas, real examples, and cross-references to our deeper analysis.
A casino bonus credited to a new player's account without requiring any deposit, claimable simply by registering.
No deposit bonuses are real-money credits or free spins given by online casinos to new registrants without requiring a payment method or deposit. They are subject to wagering requirements (typically 30x–50x) and a maximum cashout cap (usually $50–$200). Casinos use them as user acquisition tools.
A specific number of slot spins granted at a fixed value, with winnings usually subject to wagering requirements.
Free spins are pre-paid spins on a designated slot machine, typically valued at $0.10–$0.25 each. Winnings from free spins are most often credited as bonus funds with associated wagering requirements (e.g. 30x), though "wager-free" or "cash spins" exist where winnings are paid in real money instantly.
The multiple of a bonus amount a player must wager before bonus winnings can be withdrawn.
A wagering requirement (often noted as "30x" or "WR 30x") is the total volume of bets a player must place before bonus winnings convert to withdrawable cash. A $25 bonus with 30x wager requires $750 of cumulative bets. Lower wagers (1x–10x) are highly favorable; 40x+ is industry standard but harder to clear.
The maximum amount a player can withdraw from winnings derived from a no-deposit bonus.
Max cashout is a per-bonus cap on withdrawable winnings, typically $50–$200 for no-deposit bonuses. Winnings exceeding this cap are forfeited upon withdrawal. This is a casino's primary risk-control mechanism for no-deposit promotions.
A bonus that adds a percentage of a deposit as bonus funds (e.g. 100% match up to $500).
Deposit match bonuses are the most common welcome offer, doubling (or more) a player's first deposit up to a cap. A "100% up to $500" bonus on a $200 deposit adds $200 in bonus funds. Wagering requirements often apply to (deposit + bonus) combined.
A bonus where the principal amount can be withdrawn after meeting wagering, not just the winnings.
Cashable bonuses allow withdrawal of both winnings AND the original bonus amount once wagering is cleared. Sticky bonuses, by contrast, are forfeited at withdrawal — only winnings beyond the bonus are paid. Cashable terms are more player-favorable.
A bonus that cannot be withdrawn — only winnings derived from it are cashable.
Sticky bonuses remain "stuck" to the account and are deducted at withdrawal. If you deposit $100 and receive a $100 sticky bonus, balance = $200; after wagering and reaching $300, withdrawal = $200 (winnings + deposit).
The long-term percentage of all wagers a slot or game returns to players, expressed as a percentage.
RTP is a theoretical statistical measure averaged over millions of spins. A slot with 96.5% RTP returns $96.50 per $100 wagered on average over time, with the remaining $3.50 being house edge. RTP does NOT predict short-session outcomes due to variance. Industry range: 88% (low) to 99% (very high). NetEnt Mega Joker holds 99.0%.
The mathematical advantage the casino has over the player, expressed as the inverse of RTP.
House edge is the percentage of every wager the casino keeps over the long term. Roulette (European) house edge = 2.7%. Blackjack with optimal play = 0.5%. Baccarat banker bet = 1.06%. Slots vary widely (1%–12%).
The average outcome of a bet over infinite repetitions, calculated as win-probability × payout minus loss-probability × stake.
Expected Value is the cornerstone of value betting and bonus hunting. A positive EV (+EV) bet has long-term profit; negative EV (–EV) has long-term loss. Bonus hunters specifically seek bonuses where the bonus value exceeds the expected loss from required wagering. EV-driven decisions outperform intuition over large samples.
A measure of risk in a slot, indicating how often and how much it pays out.
Low-volatility slots pay frequent small wins (good for clearing wagering). High-volatility slots pay rare large wins (good for chasing big jackpots but risky). Wagering requirement strategy: low-volatility slots reduce variance and improve clearance probability.
A bet-sizing formula that maximizes long-term bankroll growth by betting a fraction proportional to edge over odds.
Kelly Criterion calculates optimal stake size given the bettor's estimated edge. Full Kelly is aggressive; "half Kelly" or "quarter Kelly" is the practical industry default to reduce volatility. Used by professional sports bettors and value casino players.
A statistical model that predicts football match scorelines using historical attack and defense rates.
Poisson regression models goal counts as a Poisson distribution where λ (expected goals) is derived from team attack rates × opponent defense rates × home/away factor. It generates a probability matrix for every possible scoreline, used to compute 1X2, Over/Under, and BTTS true probabilities. SpinBonus's Sports Engine uses Dixon-Coles-adjusted Poisson with rolling 38-match form weighting.
A bet where the implied probability from the bookmaker odds is lower than the true probability.
A value bet (or +EV bet) exists when (1 / decimal odds) < model-derived true probability. Professional bettors only place bets with confirmed value, ignoring the rest. Compounding +EV bets over time produces consistent profit despite individual losses.
The "true" probability extracted by removing the bookmaker's margin from posted odds.
Bookmakers add margin (vig) by setting odds whose implied probabilities sum to >100%. Removing the vig proportionally reveals the bookmaker's true price. Comparing your model's probability to no-vig odds is the cleanest value detection method.
The three-way outcome market for football matches: Home Win (1), Draw (X), Away Win (2).
The fundamental football betting market with three mutually exclusive outcomes. SpinBonus's Poisson model outputs P(home), P(draw), P(away) which sum to 1.0. Used as the basis for all derived markets (Over/Under, BTTS, Asian Handicap).
A market predicting whether total goals scored will exceed (Over) or fall short (Under) of a line, typically 2.5.
Over/Under markets typically use 0.5, 1.5, 2.5, 3.5 lines. The 2.5 line is most popular. Probability is derived from Poisson by summing P(0-0), P(1-0), P(0-1), P(1-1), P(2-0), P(0-2) for Under 2.5 and the rest for Over 2.5.
A market predicting whether both teams will score at least one goal in a match.
BTTS pays out if both teams score. Poisson-derived probability = (1 − P(home goals = 0)) × (1 − P(away goals = 0)). Typically 50–55% probability in major leagues; market overprices BTTS:Yes due to public bias toward goals.
A goal-handicap betting market that eliminates the draw, refunding stakes on quarter-line pushes.
Asian handicaps remove the draw by giving one team a virtual goal head-start (+0.5, +1.0) or deficit. Quarter handicaps (+0.25, +0.75) split the stake between two adjacent lines. Tighter spreads and lower vigorish than 1X2.
The percentage of total handle a bookmaker keeps as profit, also called overround or vigorish.
A market with odds summing to 105% has 5% hold. Sharper books (Pinnacle, Betfair Exchange) hold 1–3%; recreational books (DraftKings, FanDuel) hold 5–8%. Lower hold means tighter prices and easier value finding.
A withdrawal processed in under one hour, typically via crypto or fast e-wallet rails.
Instant withdrawal casinos process payouts within minutes, requiring no manual review. Payment rails: Bitcoin Lightning, USDT/Tron, Skrill, Neteller. Traditional bank wires never qualify; SEPA is borderline (1–3h).
The total funds dedicated to gambling, separated from living expenses.
Bankroll management is the foundation of long-term play. Standard rule: never wager more than 1–5% of bankroll on a single bet (lower for high-variance games, higher for low-edge bets like blackjack). Kelly Criterion provides mathematical optimum.
An online casino that accepts cryptocurrency deposits and withdrawals (BTC, ETH, USDT, LTC).
Crypto casinos accept Bitcoin, Ethereum, Tether, Litecoin and other digital assets. Advantages: faster withdrawals (often <1 hour), reduced KYC, anonymous deposits, no banking holds. Drawbacks: price volatility for held balances, fewer regulatory protections.
A casino that does not require government-ID verification for play and withdrawal.
Most crypto-only casinos waive KYC (Know Your Customer) verification for deposits and withdrawals up to certain thresholds. Players retain anonymity. Often combined with "no-KYC up to 2 BTC withdrawal" tiers, with KYC required only for high rollers or fiat off-ramps.
The UK regulator licensing and supervising all gambling operators serving British residents.
The UK Gambling Commission (UKGC) is the strictest mainstream regulator: mandatory affordability checks, GAMSTOP self-exclusion integration, no credit cards, strict bonus T&C transparency. UKGC license is the gold standard for player protection.
The Maltese regulator licensing many EU-facing online casinos and betting operators.
MGA licenses are the dominant license type in EU online gambling. Lighter than UKGC on affordability checks but strong on KYC and AML. Operators can serve players in many EU countries under MGA passport rights (with some local opt-outs).
An offshore Caribbean gambling license, the most common license for crypto and lower-cost operators.
Curaçao licenses are the cheapest mainstream license (~$15k/year vs $50k+ MGA). Lighter regulatory oversight; player dispute resolution is weak. Most no-KYC and crypto-only casinos hold Curaçao. Recently reformed (2024) to LOK regime with stricter minimums.
The UK's national self-exclusion register that blocks registered users from all UKGC-licensed gambling sites.
GAMSTOP is mandatory for all UKGC-licensed operators. Players self-register for 6 months / 1 year / 5 years and are blocked from all UK-licensed gambling sites. "Non-GAMSTOP" casinos (offshore-licensed) operate outside this network and are sometimes targeted by self-excluded players (problematic).
Practices and tools that minimize gambling-related harm — deposit limits, time-outs, self-exclusion, and verified support resources.
Mandatory features at licensed operators: deposit limits, loss limits, session reminders, reality checks, time-out periods, self-exclusion. Verified support: BeGambleAware (UK), GamCare, Gamblers Anonymous, NCPG (US).