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Non System Service Payment

The "Non System Service Payment" module is a system smart contract responsible for processing payments related to services in which DAO Ace Stream does not receive a fee (for example, system payments related to prediction market).

All the payments in this category are done in XAT only.

Payment with XAC is possible, but in such case the network performs an automatic exchange XAC -> XAT on built-in DEX (decentralized exchange) before making a transaction. Such an exchange is outside the scope of this smart contract, therefore, in this section only payment in XAT is described.

Payment Algorithm

  • if the payer has enough XAT then:
    • the required amount of XAT is being charged from the payer and burned
    • if the lockedPool is not empty then the same amount of XAT is put into circulation (moved from lockedPool to unlockedPool)
  • if the payer doesn't has enough XAT then the transaction is declined


def makeNonSystemServicePayment(sourceAccount, amount):
    sourceAccount - the payer account
    amount - amount of payment in XAT
    if sourceAccount.balance.xat >= amount:
        # Burn `amount` XAT from the source account
        sourceAccount.balance.xat -= amount
        System.BLACKHOLE.balance.xat += amount

        # Unlock at most `amount` XAT
        toUnlock = min(amount, System.lockedPool.amount)
        if toUnlock > 0:
            System.lockedPool.amount -= toUnlock
            System.unlockedPool.amount += toUnlock
        raise Exception('not enough tokens')