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To prevent Distributed Denial of Service (DDoS) attacks, all transactions that change the blockchain’s ledger state (non-read-only) require a certain amount of Gas to be consumed. The calculation method of Gas fee on AxiomLedger is similar to Ethereum’s.

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Basic Description

Gas is a common mechanism in blockchains. The original intention of Gas is to prevent users from DDoS attacks on the blockchain system. The Gas model is similar to cloud computing, except that cloud computing charges by time units, while Gas charges based on the computational resources consumed: Gas Fee=Gas Used×Gas Price\text{Gas Fee}=\text{Gas Used} \times \text{Gas Price} where Gas Fee is the total cost that a user need to pay for the transaction, Gas Used is the computational resources consumed during execution, Gas Price is the price per Gas unit.

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Gas Limit

Some smart contracts may have infinite loop by accident. To prevent costing too much Gas, users can set Gas limit manually, otherwise AxiomLedger will automatically set Gas limit to 10810^8.
Please note: Manually setting Gas limit over 10810^8 will be ignored.

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Dynamic Gas Price

In our system, Gas can not only prevent DDoS attacks, but also dynamically adjust for network conditions. We call this model the dynamic Gas price model. The dynamic algorithm is as follows: dynamic_gas_price The basic idea of this algorithm is that the Gas price in the current block will change based on the situation of the parent block. Specifically, it will linearly fluctuate based on the proportion of transactions packed in the parent block to the maximum allowed number of transactions in the block, with a maximum fluctuation of 12.5%.

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Gas Price Bound

To keep the Gas price fluctuating within a reasonable range, we have set upper and lower bounds for the Gas price. In testnet, the upper bound is 10000 GMol, and the lower bound is 1000 GMol. As for initial state, Gas price is set to 5000 GMol.