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Quick answerWe score each slot site on seven weighted checks that add up to 100%: payout rules, bonus fairness for slots, game library and RTP transparency, banking, licence and owner, support, and mobile. Payouts and bonus terms weigh the most. Every figure comes from the casino’s own pages or the game’s info screen, and we show the date we checked it.
On this page
- What do we score, and how much does each part count?
- Why do payout rules carry the most weight?
- How do we judge a slots bonus?
- How do we check a slot’s RTP?
- What counts for the game library?
- How do banking, licence, support and mobile score?
- What about casinos we cannot verify?
- How often do we re-check?
- What will we never do?
What do we score, and how much does each part count?
Our score has seven parts. The two that decide whether a slots player actually gets money out, payout rules and bonus fairness, carry nearly half the total. The table shows each weight and what we read to fill it in. The weights always add up to 100%.
| Check | What we read | Weight |
|---|---|---|
| Payout rules | Stated payout time per method, minimum and maximum withdrawal, caps per payout or per week, fees | 25% |
| Bonus fairness for slots | Wagering multiple and what it applies to, slot contribution, max cash-out on free spins, max bet, expiry | 20% |
| Game library and RTP transparency | Slot count and types, jackpots, whether RTP is shown in each game’s info screen | 15% |
| Banking | Coins and cards accepted, deposit minimums, how clear the cashier and banking page are | 15% |
| Licence and owner | Named licensing body, licence number, named operating company | 10% |
| Support | Live chat access, help center depth, how complaints are handled | 10% |
| Mobile | Slots load and play in a phone browser, cashier and terms easy to reach | 5% |
| Total | 100% |
Why do payout rules carry the most weight?
A slot win is only real once it reaches your wallet. That is why payout rules take 25% of the score. A casino with a smaller bonus but quick, clearly stated crypto payouts will usually beat one with a huge match and a low cap on each withdrawal.
We record the fastest method the casino states, the minimum and maximum per payout, and any limits on how often you can withdraw. For example, BetWhale states a $150 minimum and a $2,500 maximum per withdrawal, and that holds its score down even though its welcome match is large.
We also follow the withdrawal flow the terms describe: which verification steps apply, whether a deposit method must be used for the payout, and whether a bonus blocks withdrawals until it clears. Real money slots only pay if that flow works.
How do we judge a slots bonus?
We ignore the headline figure and work out what the bonus asks of a slots player. That means the wagering multiple, what it is applied to, how much slots count, how long you have, and any cap on what free spins can pay. The bonus that is easiest to clear often scores better than the biggest one.
Wagering, worked through
Example only: a $100 deposit with a $100 bonus at 35x on deposit plus bonus means $200 x 35 = $7,000 in slot bets before you can withdraw. At 25x on the same amounts, it is $5,000. The multiple and what it applies to matter more than the bonus size.
We then estimate the expected cost of clearing it: wagering cost = total bets x house edge. Example only: $7,000 in bets on a slot with a 4% house edge (96% RTP) costs about $280 on average. If that is more than the bonus is worth, the bonus scores poorly.
Slot contribution and free spin caps
Most offshore bonuses count slots at 100% and exclude or reduce table and live games. We check the exclusion list, because it tells you which games you will be stuck with while wagering. We also read the cap on free spin winnings. Wild Casino, for instance, pays its welcome spins with no rollover but caps them at a $100 win, and we show both facts side by side.
Our slot bonuses hub goes deeper on each bonus type.
How do we check a slot’s RTP?
We read RTP from the game itself, never from a third-party list. Open a slot, tap the info or help screen, and most games state their return to player there. If the casino does not show it, we look for the figure on the game provider’s own page. If neither source gives a number, we say the RTP is not published.
This matters because some slots come in more than one RTP version, and a casino may run a lower one than the figure quoted elsewhere. The info screen at the casino you play is what applies to your spins.
RTP is a long-run average across huge numbers of spins, not a forecast for your session. Example only: at 96% RTP, $100 in total bets returns about $96 on average over time. Any single session can land far above or below that, especially on high-volatility games. Our slot guides explain RTP and volatility in detail.
What counts for the game library?
We look at how many slots a casino offers, whether it has jackpot slots, and whether the lobby lets you search and filter by type. A big library helps, but transparency counts more: a casino that shows RTP in each game’s info screen earns more than one that hides it. We do not reward sheer numbers alone.
How do banking, licence, support and mobile score?
These four checks make up the remaining 40%. They rarely decide a ranking on their own, but they separate casinos that are close on payouts and bonuses. A weak result in any of them is noted as a con on the casino card.
Banking (15%)
We list the coins and cards accepted, the minimum deposit, and any fees the casino states. A clear banking page with limits laid out in a table scores better than terms scattered across help articles.
Licence and owner (10%)
We record the licensing body and licence number where the casino publishes them, and the company named as operator. None of the casinos on our list is licensed by a US state; they are offshore. A casino that names no licensing body at all scores lowest here, and we say so on its card.
Support (10%)
We check how you reach support, whether a help center explains bonus and withdrawal rules, and whether the terms describe a complaints route. Reader reports sent through our contact form count as a pattern signal, never as a single deciding story.
Mobile (5%)
We check that the lobby, slots, cashier and terms work in a phone browser, since that is where many people play. It carries the smallest weight because almost every site now passes the basics.
What about casinos we cannot verify?
If we cannot read a casino’s current terms from its own pages, we give it no score and no figures. Super Slots and BetOnline are in that position today: we have not yet verified their terms, so their cards point you to the casino’s site to check the current offer yourself.
How often do we re-check?
We re-read the terms of ranked casinos regularly and as soon as a reader reports a change. Each casino card shows the date its terms were last checked. When a term changes, the score is recalculated with the same weights, and the ranking can move up or down.
What will we never do?
- Sell a ranking or let a commission change a score. See our affiliate disclosure.
- Publish a slot RTP, max win or provider we have not read from the game or its provider.
- Call an offshore casino licensed in the US.
- Suggest that any method beats the house edge. Slots are random, and you should play only with money you can afford to lose. See our responsible gambling page.
Slots questions, answered
How does Gambling Slots Guide rate slot sites?
We score each casino on seven weighted checks: payout rules 25%, bonus fairness for slots 20%, game library and RTP transparency 15%, banking 15%, licence and owner 10%, support 10% and mobile 5%. Every figure comes from the casino's own pages.
Where do you get a slot's RTP?
We read it from the game's info or help screen at the casino, or from the game provider's own page. We never copy RTP from third-party lists. If neither source publishes a figure, we say the RTP is not published rather than guess.
Why is a bigger bonus not always ranked higher?
We score the cost of clearing it, not the headline. Wagering multiple, what it applies to, slot contribution, expiry and caps on free spin winnings decide the value. A small bonus at low wagering often beats a large one at high wagering.
Do casinos pay for better rankings?
No. Some links are affiliate links marked rel="sponsored", and we may earn a commission, but commissions never buy a ranking. Scores come only from the published method. See our affiliate disclosure for details.
Why do some casinos have no rating?
When we cannot read a casino's current terms from its own pages, we show no figures and no score. Super Slots and BetOnline are in that position now. We have not yet verified their terms, so check them on the casino site.