Sui Blackjack
Sui blackjack is classic 21 rebuilt as a native Sui application: you bet in SUI from your own wallet, the shoe for every hand is committed to the Sui blockchain before you act, and winnings settle back to you in about a second for gas measured in fractions of a cent. This page covers the Sui-specific experience — MIST-level precision, zkLogin onboarding, on-chain commitments and how to verify a hand on a Sui explorer — rather than blackjack rules in general.
Play Sui blackjack →Betting in SUI, precise to the MIST
Every wager at the Llamabet blackjack table is denominated in SUI, the native token of the Sui network, with a minimum bet of 1 SUI. Under the hood, amounts are handled in MIST — the base unit of SUI, where one SUI equals exactly one billion MIST. That matters more than it sounds: all stake and payout math happens in whole integer MIST, never floating point, so a 3:2 natural on a 1 SUI bet pays out to the exact unit with zero rounding drift. Your balance is not a number in a casino database; it is a set of coin objects in your own wallet, and each bet is a discrete transaction moving a precise amount you approved. Nothing is pooled, estimated or reconciled later.
Instant settlement after every single hand
On a conventional gambling site, 'winning' means a number went up in the operator's ledger and you may apply to withdraw it. On Sui blackjack, winning means an on-chain transfer to your address that finalizes in well under a second — Sui's consensus reaches finality fast enough that your payout is spendable before the next hand is dealt. Push a tie and your stake returns immediately; surrender and half comes straight back; hit a natural and 2.5x your bet lands in your wallet while the cards are still on screen. There is no cashout queue, no minimum withdrawal, no pending state. Settlement per hand, not per session, is the single biggest feel difference between blackjack on Sui and blackjack anywhere else.
Two ways in: zkLogin or a Sui wallet
You can reach the table by either of Sui's two front doors. The fastest is zkLogin: sign in with your Google account and Sui's native zero-knowledge login derives a real self-custodial address from the OAuth credential — no seed phrase, no browser extension, no custodian, and the casino never touches your keys. It is the closest thing in crypto to just logging in, and it produces a wallet as sovereign as any other. Alternatively, connect an existing Sui wallet such as Slush and play from the balance you already hold. Both paths land in the same place: your funds stay yours, bets are transactions you individually authorize, and switching devices is as simple as signing in again.
The shuffle commitment lives on Sui
Before each hand, the four-deck shoe is deterministically shuffled from a secret server seed, and a SHA-256 commitment to that seed is published on the Sui blockchain — verified by a Move smart contract that checks a BLS signature from the house's registered key, then frozen as an immutable on-chain object. Sui is doing real work here: frozen objects on Sui can never be modified or deleted by anyone, so the commitment is not a screenshot-able promise but a permanent network record that provably predates your bet. After the hand, the seed is revealed and the whole deck can be recomputed. The contracts doing this are public — every address is listed at /contracts — so the anchor of the fairness scheme is itself auditable.
Gas costs: fractions of a cent
Skeptics of on-chain gambling usually point at gas, and on many chains they are right — nobody wants to pay a dollar of fees on a five-dollar hand. Sui's fee market makes the objection obsolete. A typical transaction costs fractions of a cent, low enough that per-bet and per-payout transactions are economically invisible next to a 1 SUI minimum stake, and low enough that the house can afford to anchor fairness commitments on-chain for every hand rather than batching them. You will generally spend more on the blackjack itself in a single hand than on gas across an entire session. Cheap block space is what lets Sui blackjack be genuinely on-chain instead of on-chain-in-name-only.
Verifying a hand on a Sui explorer
Because the commitments are ordinary Sui objects, you can audit a hand with nothing but a block explorer. Take the commitment referenced by your game, look it up on a Sui explorer such as Suiscan or SuiVision, and confirm three things: the object contains the server-seed hash, it is frozen (immutable), and its timestamp predates your bet. After the reveal, hash the disclosed seed and check it matches the committed value, then re-run the published deterministic shuffle to reproduce your exact shoe. None of this requires Llamabet's cooperation — that is the point. The explorer sees the same chain you do, and the chain does not care what either of you hoped the cards would be.
Table rules at a glance
The blackjack itself is the classic game: four-deck shoe, dealer hits 16 and stands on 17, natural blackjack pays 3:2, standard win returns double your stake, tie pushes, double down available on hard 9, 10 and 11, and surrender returns half. Played with basic strategy the house edge is roughly half a percent — excellent odds, but still an edge, so the long-run direction is what it is. Bet within a budget you set before sitting down, keep stakes at a size where variance is entertainment rather than stress, and walk away when it stops being fun. Sui makes the game fast and provable; playing it sensibly is on you.
Frequently asked questions
How do I play blackjack on Sui?
Go to llamabet.co, sign in with Google (zkLogin creates a self-custodial Sui wallet with no seed phrase) or connect a Sui wallet like Slush, open Blackjack and set your stake — minimum 1 SUI. Each bet is a Sui transaction you approve, and payouts settle back to your wallet in about a second.
Is my money safe playing Sui blackjack?
Your funds are self-custodial: they live in your own Sui wallet and Llamabet never holds your keys. Bets and payouts are on-chain transactions, fairness commitments are frozen immutable objects on Sui, and all contract addresses are published at /contracts for independent inspection.
What does a hand of Sui blackjack cost in gas?
Fractions of a cent. Sui transaction fees are typically well below one cent, so gas is negligible against the 1 SUI minimum bet — an entire session's fees usually total less than a single hand's stake. That is also what makes per-hand on-chain fairness commitments affordable.