Monster
Graded-card gacha packs · Pokémon + One Piece · publishes its own lifetime returns
In short: Monster publishes a single, apparently-honest odds set — there's no advertised-vs-real gap. Its headline ~104–112% return is gross — at the operator's own FMV per card, published on every pull, before the cash-out haircut — and value is realised as USD, so the real figure is lower.
At a glance
Not yet verified: payment methods, min buy-in, deposit fees, withdrawal fee, payout method, payout speed, shipping cost, ID check, regions.
The good
- Publishes its pull odds, so buyers can actually check them — many rip sites don't.
- The published odds are the real ones — no advertised-vs-real gap.
- Public live pull feed with values, so real returns can be verified.
The bad
- The headline return is gross — before the 92% cash-out, and card values are the site's own estimates, so what you actually keep is lower and unverified.
- Card values are the operator's own estimates, not independent market prices.
- Payouts come back as crypto (a wallet balance), not cash — you carry custody and stablecoin risk, plus an extra step to reach your bank.
- Publishes its own lifetime return on 225,000+ pulls
- Five value bands per pack, summing to exactly 100%
- 86–95% instant buyback, published per pack
Monster review
Monster runs six gacha packs at mnstr.xyz: you buy one, it opens to a single real graded card, and from there you either keep the card or take an instant buyback. The catalogue is small and deliberate — a $50 Starter, a $100 Great Pack, a $250 Premium and a $1,250 Ultra on the Pokémon side, plus a $150 Adventure and a $500 Outlaw pack for One Piece. One card per pull, every time, which makes the arithmetic unusually easy to follow.
Every pack publishes its odds as five value bands — Common through Legendary — each with a dollar range and a probability. Two details make that better disclosure than it sounds. The probabilities sum to exactly 100.000% on all six packs. And both ends of every band are bounded, including the Legendary one, which is rare: most operators leave the top band open-ended, and an open top band is where a published EV quietly stops meaning anything.
The disclosure that actually sets Monster apart, though, is on the storefront itself. Each pack carries its own lifetime pull count and the total value pulled from it — 118,460 Starter pulls returning $6.6m, 45,677 Premium pulls returning $12.8m, and so on. That is a self-reported measured return over a real six-figure sample, published without being asked. No other operator we track puts that number on the table.
How Monster works
Pick a pack, open it, and it reveals one real graded card — CGC, PSA and BGS slabs all show up in the live feed — held against Monster's vault. You can keep the card or take the instant buyback and be done.
The catalogue is six packs and it stays six packs, which is a different posture from the operators running fifty. Pokémon runs Starter at $50, the Great Pack at $100, Premium at $250 and Ultra at $1,250; One Piece has the Adventure pack at $150 and the Outlaw pack at $500. Every one of them contains exactly one card.
The odds — five bands, and both ends bounded
Each pack publishes a five-band value distribution: Common, Uncommon, Rare, Epic and Legendary, each a dollar range with a probability. On the $50 Starter that's 69.03% Common ($27–50), 24.07% Uncommon ($50–100), 5.22% Rare ($100–200), 1.48% Epic ($200–500) and 0.19% Legendary ($500–3,000). We check the weights on every pack and on all six they sum to exactly 100.000%.
The bounded top band is the part worth appreciating. Most operators publish a Legendary tier as "$500+" with no ceiling, which makes any midpoint-based expected value a function of how optimistic you feel rather than anything the pack does. Monster caps every band at both ends, so its published odds can actually be turned into a number — and that number can be checked against what the packs have really paid out.
What the packs have actually returned
Monster publishes, per pack, how many times it has been pulled and how much card value has come out of it. Divide one by the other and you get a measured return on a sample no model can argue with: 111.2% on the Starter over 118,460 pulls, 112.1% on Premium over 45,677, 106.6% on the Great Pack, and 103.7% on the Ultra and both One Piece packs. Across all six that is $42.2m of value out of $39.3m staked over 225,330 pulls — 107.5%.
That is the figure we publish, rather than a sum of band midpoints. The midpoint model reads 121.9% on the Starter against their measured 111.2%, because cards cluster near the floor of a band rather than the middle. A six-figure sample of what actually came out beats a model of what might have, so the model only gets used here as a cross-check on the disclosure — and the two are consistent in the direction you'd expect.
One thing to hold onto: those are Monster's own valuations of its own cards, on its own count, unaudited. We report them as theirs, and we measure the public pull feed separately so there is eventually a number that isn't.
What you keep — the buyback
The buyback is published per pack and climbs with the price: 86% on the $50 Starter, 89% on the Great Pack, 92% on Premium, 93% and 94% on the One Piece packs, and 95% on the $1,250 Ultra. Bigger packs cash out better, and none of it is hidden.
That haircut is where the gross figures land in reality. Weighted by how much money actually goes through each pack, the buyback averages 92.1% — so Monster's own 107.5% gross becomes about 99% if you sell everything straight back. Per pack it runs 94.9% on the Great Pack up to 103.1% on Premium, which on their published numbers is the rare pack that clears break-even after cash-out. Keeping the graded card instead leaves you the full value and the job of selling it yourself.
The live feed, and why our measured number will take a while
Monster publishes a public feed of recent pulls, and it is a good one: each row carries the pack, the price paid, the card's FMV, the buyback payout, and the full card — player, set, year, grading company and grade. That is everything an independently measured return needs, and we collect it.
The limitation is depth. The feed returns exactly twelve rows and ignores every pagination parameter we tried, so it holds only a few minutes of history at typical volume. We poll it on a tight cycle to catch as much as we can, but our sample here will build more slowly than at operators who expose a paginated feed.
It does show every pull, though, not just the cashed-out ones — each row is marked as sold back or still held, and both appear. That matters, because it means our measured return isn't quietly missing the cards people decided to keep. It also makes something visible that most feeds hide: the cards buyers hold onto are, unsurprisingly, the better ones. We're not putting a number on that gap yet — the sample is far too thin — but it's the kind of thing this feed can eventually answer.
Is Monster legit?
It delivers real graded cards, publishes odds that sum correctly with no open-ended top band, states a buyback rate on every pack, and volunteers its own lifetime return on a six-figure sample. On willingness to show its numbers it is at the top of our board.
The honest caveats are the ones above: settlement is on-chain, so you need a wallet and the cash-out path is yours to manage; the card values are Monster's own rather than an independent market source; and the public feed is too shallow to build a fast independent check. None of that is concealed — it is just the difference between a company reporting its own results and someone else verifying them.
Monster: frequently asked questions
What is Monster (mnstr.xyz)?+
A card-rip site where you buy one of six gacha packs, it opens to a single real graded card, and you either keep the card or take an instant buyback. Packs run $50 to $1,250 across Pokémon and One Piece.
Does Monster publish its odds?+
Yes — five value bands per pack (Common through Legendary), each with a dollar range and a probability. We verify the weights sum to 100%, and on all six packs they come to exactly 100.000%. Unusually, both ends of every band are bounded, including the top one.
What return do Monster packs actually give?+
Monster publishes each pack's lifetime pull count and total value pulled, which works out to 103.7% on the Ultra and One Piece packs up to 112.1% on Premium — 107.5% across all six over 225,330 pulls. Those are gross figures on their own valuations; after the buyback you'd cash out at, the same numbers land near 99%.
What is Monster's buyback rate?+
It is published per pack and rises with the price: 86% on the $50 Starter, 89% on the Great Pack, 92% on Premium, 93–94% on the One Piece packs and 95% on the $1,250 Ultra. You can keep the graded card instead and retain the full value, at the cost of selling it yourself.
Which Monster pack is the best value?+
On Monster's own published figures the $250 Premium pack: 112.1% gross over 45,677 pulls, and 103.1% after its 92% buyback — the only one of the six that clears break-even once you cash out. The $50 Starter posts the second-best gross at 111.2%, but its 86% buyback is the lowest of the six.