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|[thirdweb OP Sepolia Faucet](https://thirdweb.com/op-sepolia-testnet?utm_source=opdocs\&utm_medium=docs)| OP Sepolia |
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|[Tenderly Unlimited Faucet](https://docs.tenderly.co/virtual-testnets/unlimited-faucet?mtm_campaign=ext-docs&mtm_kwd=optimism)| OP Sepolia, OP Mainnet, and [85+ other networks](https://docs.tenderly.co/supported-networks?mtm_campaign=ext-docs&mtm_kwd=optimism)|
|[thirdweb OP Sepolia Faucet](https://thirdweb.com/op-sepolia-testnet?utm_source=opdocs\&utm_medium=docs)| OP Sepolia|
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|[Tenderly Unlimited Faucet](https://docs.tenderly.co/virtual-testnets/unlimited-faucet?mtm_campaign=ext-docs\&mtm_kwd=optimism)| OP Sepolia, OP Mainnet, and [85+ other networks](https://docs.tenderly.co/supported-networks?mtm_campaign=ext-docs\&mtm_kwd=optimism)|
Copy file name to clipboardExpand all lines: pages/app-developers/tools/supersim.mdx
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## Next steps
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* Build a [revolutionary app](/app-developers/get-started) that uses multiple blockchains within the Superchain
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* Deploy a [SuperchainERC20](/stack/interop/tutorials/deploy-superchain-erc20) to the Superchain
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* View more [interop tutorials](/stack/interop/tutorials)
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* Check out the collection of [Supersim docs](/app-developers/tutorials/supersim) for tutorials and specific use cases.
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* Questions about Interop? Check out our collection of [interop guides](/stack/interop) or check out this [Superchain interop design video walk-thru](https://www.youtube.com/watch?v=FKc5RgjtGes).
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* For more info about how Superchain interoperability works under the hood, [check out the specs](https://specs.optimism.io/interop/overview.html).
Copy file name to clipboardExpand all lines: pages/app-developers/transactions/parameters.mdx
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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.
The `supersim` chain environment includes contracts already deployed to help replicate the Superchain environment. See [OP Chain A](op-chain-a) for contract address examples for a L2 system.
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The `supersim` chain environment includes contracts already deployed to help replicate the Superchain environment. See [OP Chain A](./chain-a) for contract address examples for a L2 system.
Copy file name to clipboardExpand all lines: pages/connect/contribute/style-guide.mdx
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* Use anchor links, whenever possible, to guide users to a specific page and location in the technical documentation. This reduces cognitive load and improves overall usability.
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* To link to an anchor, such as an H3 tag within a page, you need to append it to the page name preceded by `#`, like this **example**: `[any descriptive text](/chain/getting-started/overview#test-your-application)`.
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* To link to an anchor, such as an H3 tag within a page, you need to append it to the page name preceded by `#`, like this **example**: `[any descriptive text](/stack/interop/tutorials/deploy-superchain-erc20)`.
Copy file name to clipboardExpand all lines: pages/notices/holocene-changes.mdx
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The Holocene upgrade for the Soneium Minato (Sepolia) will be activated at **Fri Dec 20 at 09:00:00 UTC** (`1734685200`).
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The Holocene upgrade for the Soneium Minato (Sepolia) will be activated at **Fri Dec 20 at 09:00:00 UTC** (`1734685200`).
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The Holocene upgrade for the Mainnet Superchain is scheduled for **Thu 9 Jan 2025 18:00:01 UTC**, [governance approval](https://vote.optimism.io/proposals/20127877429053636874064552098716749508236019236440427814457915785398876262515).
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The Holocene upgrade for the Soneium Mainnet will be activated at **Mon Feb 03 at 09:00:00 UTC** (`1738573200`).
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