00 · ABSTRACTCrack a pack, catch a meme
SENBEI turns community-supplied meme tokens and stable backing into weighted packs. A supplier batch becomes ten independently selectable cards. A player opens one, three, or five cards and chooses the meme token or paired stable value for each reveal.
FOUNDATION STATUSThe domain, interface, conserved math, Robinhood network configuration, wallet boundary, and RPC preflight exist. Production contracts, custody, settlement, admission, swaps, and payouts remain launch gates.
01 · CONSERVE EVERY GRAINTen cards, zero rounding loss
Token and stable deposits are split independently with bigint arithmetic. Floors are summed and the complete remainder is assigned to the final card. No atomic unit may be created, rounded away, or left outside the ledger.
| Cards | Tier | Per-card weight | Batch weight |
|---|
| 8 | Cooked | 10,250 | 82% |
| 1 | Based | 12,000 | 12% |
| 1 | Moonshot | 6,000 | 6% |
Σ tokenCardᵢ = tokenDeposit
Σ stableCardᵢ = stableDeposit82/12/6 is the distribution of a complete fresh batch. Live pool probabilities change when individual cards are caught or withdrawn.
02 · WEIGHTED DRAWSelection without replacement
For every pull, a card's chance is its integer weight divided by the total remaining eligible weight. The winner is removed before the next pull, preventing one physical ledger card from appearing twice.
W = Σ remaining weights
P(cardᵢ) = weightᵢ / W
winner is removed before pull i + 1A paid quote must bind the pack size, ledger version, exact eligible IDs, card amounts, weights, fee, coverage requirement, expiry, and randomness commitment. A retry resumes that commitment rather than redrawing.
03 · PACK ECONOMICSExpected backing plus 6%
The quote uses the weighted expected stable backing of eligible cards, rounded upward at atomic precision and multiplied by the number of pulls. A 6% supplier fee is added. The SENBEI platform fee is zero.
EV₁ = ceil(Σ weightᵢ × backingᵢ / Σ weightᵢ)
base(k) = k × EV₁
supplierFee = ceil(base × 600 / 10,000)
platformFee = 0The largest eligible k-card backing total is a separate coverage guard. It is not a claim about expected return, yield, or token performance.
04 · ROBINHOOD SETTLEMENTReceipts, logs, and obligations
1 · INTENTServer records immutable economic inputs and an idempotency key.
2 · TRANSACTIONWallet or restricted signer submits to the configured Robinhood chain.
3 · RECEIPTService verifies chain ID, status, contract, logs, amounts, and confirmations.
4 · LEDGEROne confirmed receipt satisfies one deposit, payment, payout, or withdrawal obligation.
A browser callback is never sufficient evidence that value moved. Reconciliation must be repeatable from chain receipts and must reject wrong-chain, wrong-token, wrong-recipient, reverted, duplicated, or underpaid transactions.
05 · PLAYER CHOICEExactly one side of the card
Every selected card becomes an immutable player obligation. The player chooses the meme amount or stable backing. A state machine prevents both sides from paying, and retries reuse the same obligation and transaction intent.
- A selected card can no longer be drawn or withdrawn.
- A choice cannot change after settlement begins.
- A failed transaction remains retryable without creating a second payout.
- Completion requires a verified Robinhood Chain receipt.
06 · TRUST & RISKWhat code cannot make safe
Meme-token prices and liquidity can collapse. Issuers may pause, tax, blacklist, upgrade, or otherwise alter transfer behavior. Stable assets can depeg. Contracts, signers, policies, RPC providers, indexers, databases, wallets, operators, and front ends may fail or be compromised.
SENBEI requires explicit asset admission, exposure caps, pause controls, separation of duties, monitored reconciliation, backups, incident procedures, contract and application review, and limited-value testing before production custody.
07 · LAUNCH GATESWhat must be true before “live”
- Robinhood network and explorer configuration verified from production.
- Settlement token chosen and independently verified.
- Custody and signer authority documented, restricted, and tested.
- Deposit, payment, payout, withdrawal, and pause paths reconciled from receipts.
- Asset admission and oracle/liquidity rules approved.
- Contracts and application security independently reviewed.
- Monitoring, alerting, backups, recovery, and legal materials complete.
NO TOKEN CLAIMSENBEI does not need a platform token for the pack model described here. No SENBEI token is represented as launched.
