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Copy file name to clipboardExpand all lines: pages/app-developers/transactions/parameters.mdx
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@@ -28,29 +28,27 @@ Note that, like Ethereum, the base fee is not explicitly defined within a transa
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Instead, the maximum base fee is determined as the difference between the `maxFeePerGas` and the `maxPriorityFeePerGas` fields of any given transaction.
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<Steps>
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{<h3>Retrieve the latest block</h3>}
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{<h3>Retrieve the latest block</h3>}
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Using the JSON-RPC API or your favorite Ethereum library, retrieve the latest block on OP Mainnet.
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Using the JSON-RPC API or your favorite Ethereum library, retrieve the latest block on OP Mainnet.
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{<h3>Retrieve the base fee and gas used</h3>}
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{<h3>Retrieve the base fee and gas used</h3>}
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From the block, retrieve the `baseFeePerGas`and `gasUsed` fields.
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From the block, retrieve the `baseFeePerGas` and `gasUsed` fields.
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{<h3>Predict the next base fee</h3>}
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{<h3>Predict the next base fee</h3>}
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OP Mainnet adjusts the base fee based on the amount of gas used in the previous block.
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If the previous block used more than 5m gas (of the 30m gas limit), then the base fee will increase by up to 10%.
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If the previous block used less than 5m gas, then the base fee will decrease by up to 10%.
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Refer to the [OP Mainnet EIP-1559 Parameters](/stack/differences#eip-1559-parameters) section for more details.
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OP Mainnet adjusts the base fee based on the amount of gas used in the previous block.
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If the previous block used more than 5m gas (of the 30m gas limit), then the base fee will increase by up to 10%.
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If the previous block used less than 5m gas, then the base fee will decrease by up to 10%.
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Refer to the [OP Mainnet EIP-1559 Parameters](/stack/differences#eip-1559-parameters) section for more details.
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{<h3>Select a base fee per gas</h3>}
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Using the current base fee per gas and the amount of gas used in the previous block, you can predict the next base fee per gas.
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If you are highly sensitive to the base fee, you may want to select a base fee per gas that is either 10% higher or 10% lower than the previous base fee.
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However, you may run the risk that your transaction will not be included in a block quickly.
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If you are less sensitive to the base fee, you may wish to simply use a large multiple of the previous base fee (e.g. 2x).
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{<h3>Select a base fee per gas</h3>}
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Using the current base fee per gas and the amount of gas used in the previous block, you can predict the next base fee per gas.
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If you are highly sensitive to the base fee, you may want to select a base fee per gas that is either 10% higher or 10% lower than the previous base fee.
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However, you may run the risk that your transaction will not be included in a block quickly.
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If you are less sensitive to the base fee, you may wish to simply use a large multiple of the previous base fee (e.g. 2x).
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</Steps>
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## Selecting the priority fee
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You can also use the [`eth_feeHistory`](https://docs.alchemy.com/reference/eth-feehistory) JSON-RPC method to retrieve historical priority fee data.
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You can then use this data to predict a reasonable priority fee for your transaction.
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Alternatively, you can rely on Tenderly's [`tenderly_gasPrice`](https://docs.tenderly.co/node/rpc-reference/optimism-mainnet/tenderly_gasPrice?mtm_campaign=ext-docs&mtm_kwd=optimism) to get real-time gas predictions with 3 levels of likelihood for transaction inclusion.
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Alternatively, you can rely on Tenderly's [`tenderly_gasPrice`](https://docs.tenderly.co/node/rpc-reference/optimism-mainnet/tenderly_gasPrice?mtm_campaign=ext-docs\&mtm_kwd=optimism) to get real-time gas predictions with 3 levels of likelihood for transaction inclusion.
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