Mystery box sites

You pay a fixed price to open a box and get one item from a published list, weighted by odds. The good ones show every item and its exact chance before you pay. The industry calls them case opening sites, a name borrowed from CS:GO, where the same machinery was invented for weapon skins.

The mechanics can be, and the better ones publish provably fair seeds so you can verify a result afterwards. Legitimate is not the same as profitable. Every one of these sites keeps a margin on every box, and the ones that publish it are keeping around a tenth of everything staked. Over time the average player loses, by design.

As entertainment, that is your call. As a way to buy something cheaply, no. If a box costs $50 and the site keeps 12%, six dollars of every fifty is theirs before a single prize is handed out. You are paying for the chance, not for a discount.

On a pack site you buy a pack and a real card comes out, and the card is the product. On a mystery box site the bet is the product, and the box might pay out a card, a watch, a pair of trainers or a voucher. They also carry the rest of the casino with them: wager races, deposit bonuses and play-through rules on withdrawals.

Whether it names its operator and company number, whether it publishes the odds on every item rather than just the headline prize, whether its provably fair system can actually be verified, and what the play-through policy says about getting money out. Everything else is decoration.