Glossary
Every term in one line.
Fairness
- Provably fair
- A system that lets you check a result wasn't changed after you paid. The site commits to a hidden seed before you play and reveals it after.Check a roll
- Server seed
- The site's secret random value. You see only its hash before playing; the seed itself is revealed when you rotate seeds.
- Client seed
- A value you control. Because you can change it, the site can't pre-compute your results.
- Nonce
- A counter that goes up by one with each open, so the same seeds give a new result every time.
- Hash (SHA-256)
- A one-way fingerprint of data. Anyone can compute it, nobody can reverse it, so a published hash locks the site into its seed.
- HMAC-SHA256
- The function most sites use to mix server seed, client seed and nonce into the number that decides your prize.
- Odds table
- The published chance of every prize in a box, case or pack. Without it you can't know what you're buying.
Money
- RTP (return to player)
- The share of money spent that comes back as prize value on average. RTP 90% means $90 back per $100.Work it out
- House edge
- What the site keeps on average: 100% minus RTP. A 15% edge costs you $15 per $100 opened, over time.
- Expected value (EV)
- Each prize's value times its odds, added up. The real average worth of one box.Calculator
- Sell-back
- Swapping a won item for site balance, usually at a fixed % of its listed value. Lower % means a bigger hidden edge.
- Wagering requirement
- How much you must spend before bonus money can be withdrawn. A 5× requirement on $10 means $50 of play.
Games
- Case battle
- Players open the same cases at the same time; the highest total value takes everything.
- Upgrader
- Risk an item for a chance at a pricier one. The bigger the jump, the lower the odds.
- Trade hold
- Valve's up-to-7-day lock on recently traded CS2 items. No site can skip it.CS2 guide
Cards
- Slab
- A graded trading card sealed in a hard case by a grader like PSA or CGC, with the grade on the label.
- Buyback
- An instant offer to sell your pulled card back to the site, quoted as a % of market value.
- Vault
- Storage where the site keeps your physical card so you can trade or sell it without shipping.Sealed vs slab
Safety
- KYC
- "Know your customer" ID checks. Often triggered at withdrawal; read when a site requires them before you deposit.
- Gambling licence
- Permission from a regulator to offer gambling. None of the sites we rank holds a mainstream one.How we score