# Gas calculation and Transaction execution on E Money Network

1. Nodes execute the previous block and run the EndBlock hook. As part of this hook, the FeeMarket (EIP-1559) module tracks the total TransientGasWanted from the transactions on this block. This will be used for the next block’s BaseFee.
2. Nodes receive transactions for a subsequent block and gossip these transactions to peers. These can be sorted and prioritised by the included fee price (using EIP-1559 fee priority mechanics for EVM transactions -[ code snippet](https://github.com/evmos/ethermint/blob/57ed355c985d9f3116aba6aabfa2ee0f3f38e966/app/ante/eth.go#L137)), to be included in the next block
3. Nodes run BeginBlock for the subsequent block. The FeeMarket module calculates the BaseFee ([code snippet](https://github.com/evmos/ethermint/blob/89fdd1984826ea524cb9b8feb089a99b6cfe8ace/x/feemarket/keeper/abci.go#L14)) to be applied for this block using the total GasWanted from the previous block. The Distribution module[ distributes](https://docs.cosmos.network/main/modules/distribution#begin-block) the previous block’s fee rewards to validators and delegators
4. For each valid transaction that will be included in this block, nodes perform the following:<br>

   An AnteHandler process corresponding to the transaction type is initiated. This process:

   * Performs basic transaction validation.
   * Verifies the fees provided are greater than the global and local minimum validator values and greater than the BaseFee calculated (For Ethereum transactions).
   * Preemptively consumes gas for the EVM transaction.
   * Deducts the transaction fees from the user and transfers them to the fee\_collector module.
   * Increments the TransientGasWanted in the current block, to be used to calculate the next block’s BaseFee.<br>

   Then, for standard Cosmos Transactions, nodes:

   * Execute the transaction and update the state Consume gas for the transaction<br>

   For Ethereum Transactions, nodes:

   * Execute the transaction and update the state Calculate the gas used and compare it to the gas supplied, then refund a designated portion of the surplus.
   * Send a fraction of the fees used as revenue to contract developers as part of the Revenue Module, if the transaction interacts with a registered smart contract<br>
5. Nodes run EndBlock for this block and store the block’s GasWanted.


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