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gas-budget.md

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Gas Budget

Observed on mainnet at Tact ^1.6.13. Costs will drift slightly between Tact releases and with map growth.

Per-operation gas

Operation Caller-attached Consumed Notes
MarketFactory.DeployMarketEscrow ~0.15 TON ~0.08 TON 0.05 forwarded to new escrow, rest refunded
MarketEscrow deploy (initial) 0.05 TON from factory ~0.02 TON Escrow keeps remainder as storage reserve
MarketEscrow.Deposit trade amount + 0.03 TON ~0.01 TON Excess kept in pool
MarketFactory.RecordBet 0.03 TON ~0.02 TON 0.01 forwarded to escrow
MarketEscrow.ResolveMarket 0.05 TON ~0.015 TON Cashback to oracle
MarketEscrow.ClaimWinnings 0.1 TON ~0.03 TON Cashback to claim sender
MarketEscrow.RefundDeposit 0.1 TON ~0.025 TON Cashback to refund sender
MarketEscrow.WithdrawFees 0.05 TON ~0.015 TON Forwarded through factory
MarketEscrow.DrainBalance 0.05 TON ~0.02 TON Post-settlement recovery

Operations touching deposits or claimedNonces grow in cost as those maps grow.

Storage and minimum balance

Three maps grow with usage:

  • MarketEscrow.deposits — one entry per unique depositor; decremented on claim/refund, deleted at zero.
  • MarketEscrow.claimedNonces — one entry per claim or refund, never pruned (deletion would enable double-spend).
  • MarketFactory.markets + escrowAddresses — two entries per deployed market, never pruned.

All critical handlers keep myBalance() >= ton("0.01") so storage rent cannot deactivate the account after a drain.

Known behaviors

  • Deposit uses context().value — includes forwarded gas, inflating totalPool by a few nanotons per deposit. Consistent across all users; winners receive fractionally more than theoretical share. Finding 007-INFO.
  • 257-bit integer math — no overflow risk at realistic pool sizes.

v2

Jetton-custody v2 will add multi-hop sends for fee and payout flows. Gas budget will be re-profiled as part of the v2 external audit.