95 lines
3.5 KiB
Markdown
95 lines
3.5 KiB
Markdown
---
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eip: 3044
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title: Adds `baseFee` to `eth_getBlockByNumber`
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author: Abdelhamid Bakhta (@abdelhamidbakhta)
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discussions-to: https://ethereum-magicians.org/t/eip-3044-add-basefee-to-eth-getblockbynumber/4828
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status: Stagnant
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type: Standards Track
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category: Interface
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created: 2020-10-14
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requires: 1474, 1559
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---
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## Simple Summary
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Add basefee field to `eth_getBlockByNumber` RPC endpoint response.
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## Abstract
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Adds `baseFee` property to the `eth_getBlockByNumber` JSON-RPC request `result` object. This property will contain the value of the base fee for any block after the EIP-1559 fork.
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## Motivation
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[EIP-1559](./eip-1559.md) introduces a base fee per gas in protocol.
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This value is maintained under consensus as a new field in the block header structure.
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Users may need value of the base fee at a given block. Base fee value is important to make gas price predictions more accurate.
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## Specification
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### `eth_getBlockByNumber`
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#### Description
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Returns information about a block specified by number.
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Every block returned by this endpoint whose block number is before the [EIP-1559](./eip-1559.md) fork block **MUST NOT** include a `baseFee` field.
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Every block returned by this endpoint whose block number is on or after the [EIP-1559](./eip-1559.md) fork block **MUST** include a `baseFee` field.
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#### Parameters
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Parameters remain unchanged.
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#### Returns
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For the full specification of `eth_getBlockByNumber` see [EIP-1474](./eip-1474.md).
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Add a new JSON field to the `result` object for block headers containing a base fee (post [EIP-1559](./eip-1559.md) fork block).
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- {[`Quantity`](./eip-1474.md#quantity)} `baseFee` - base fee for this block
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#### Example
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```sh
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# Request
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curl -X POST --data '{
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"id": 1559,
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"jsonrpc": "2.0",
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"method": "eth_getBlockByNumber",
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"params":["latest", true]
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}' <url>
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# Response
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{
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"id": 1559,
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"jsonrpc": "2.0",
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"result": {
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"difficulty": "0x027f07",
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"extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
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"baseFee": "0x7"
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"gasLimit": "0x9f759",
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"gasUsed": "0x9f759",
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"hash": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
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"logsBloom": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
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"miner": "0x4e65fda2159562a496f9f3522f89122a3088497a",
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"nonce": "0xe04d296d2460cfb8472af2c5fd05b5a214109c25688d3704aed5484f9a7792f2",
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"number": "0x1b4",
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"parentHash": "0x9646252be9520f6e71339a8df9c55e4d7619deeb018d2a3f2d21fc165dde5eb5",
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"sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
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"size": "0x027f07",
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"stateRoot": "0xd5855eb08b3387c0af375e9cdb6acfc05eb8f519e419b874b6ff2ffda7ed1dff",
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"timestamp": "0x54e34e8e"
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"totalDifficulty": "0x027f07",
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"transactions": []
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"transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
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"uncles": []
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}
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}
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```
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## Rationale
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The addition of a single parameter instead of introducing a whole new endpoint was the simplest change that would be easiest to get integrated.
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For backward compatibility we decided to not include the base fee in the response for pre-1559 blocks.
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## Backwards Compatibility
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Backwards compatible. Calls related to block prior to [EIP-1559](./eip-1559.md) fork block will omit the base fee field in the response.
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## Security Considerations
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The added field (`baseFee`) is informational and does not introduce technical security issues.
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## Copyright
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Copyright and related rights waived via [CC0](../LICENSE.md).
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