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EIP-3046

Adds `baseFee` to `eth_getUncleByBlockNumberAndIndex`

StagnantStandards Track: Interface
Created: 2020-10-14
Requires: EIP-1474, EIP-1559
Abdelhamid Bakhta (@abdelhamidbakhta)
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1 min read

EIP-3046 proposes adding a new field called `baseFee` to the `eth_getUncleByBlockNumberAndIndex` endpoint in Ethereum. This field is informational and does not introduce any technical security issues. The proposal is backwards compatible, meaning that calls related to blocks prior to the EIP-1559 fork block will omit the `baseFee` field in the response. The addition of this field is intended to support the EIP-1559 proposal, which aims to improve the efficiency and user experience of the Ethereum network by introducing a new transaction pricing mechanism. The `baseFee` field will be used to calculate the maximum fee that can be paid for a transaction, and will be adjusted dynamically based on network demand. Overall, the proposal is a small but important step towards improving the functionality and usability of the Ethereum network.

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Simple Summary

Add basefee field to eth_getUncleByBlockNumberAndIndex RPC endpoint response.

Abstract

Adds baseFee property to the eth_getUncleByBlockNumberAndIndex JSON-RPC request result object. This property will contain the value of the base fee for any block after the EIP-1559 fork.

Motivation

EIP-1559 introduces a base fee per gas in protocol. This value is maintained under consensus as a new field in the block header structure. Users may need value of the base fee at a given block. Base fee value is important to make gas price predictions more accurate.

Specification

eth_getUncleByBlockNumberAndIndex

Description

Returns information about an uncle specified by block number and uncle index position Every block returned by this endpoint whose block number is before the EIP-1559 fork block MUST NOT include a baseFee field. Every block returned by this endpoint whose block number is on or after the EIP-1559 fork block MUST include a baseFee field.

Parameters

Parameters remain unchanged.

Returns

For the full specification of eth_getUncleByBlockNumberAndIndex see EIP-1474. Add a new JSON field to the result object for block headers containing a base fee (post EIP-1559 fork block).

  • {Quantity} baseFee - base fee for this block

Example

# Request curl -X POST --data '{ "id": 1559, "jsonrpc": "2.0", "method": "eth_getUncleByBlockNumberAndIndex", "params":["latest", "0x0"] }' <url> # Response { "id": 1559, "jsonrpc": "2.0", "result": { "difficulty": "0x027f07", "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000", "baseFee": "0x7" "gasLimit": "0x9f759", "gasUsed": "0x9f759", "hash": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331", "logsBloom": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331", "miner": "0x4e65fda2159562a496f9f3522f89122a3088497a", "nonce": "0xe04d296d2460cfb8472af2c5fd05b5a214109c25688d3704aed5484f9a7792f2", "number": "0x1b4", "parentHash": "0x9646252be9520f6e71339a8df9c55e4d7619deeb018d2a3f2d21fc165dde5eb5", "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347", "size": "0x027f07", "stateRoot": "0xd5855eb08b3387c0af375e9cdb6acfc05eb8f519e419b874b6ff2ffda7ed1dff", "timestamp": "0x54e34e8e" "totalDifficulty": "0x027f07", "transactions": [] "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421", "uncles": [] } }

Rationale

The addition of a single parameter instead of introducing a whole new endpoint was the simplest change that would be easiest to get integrated. For backward compatibility we decided to not include the base fee in the response for pre-1559 blocks.

Backwards Compatibility

Backwards compatible. Calls related to block prior to EIP-1559 fork block will omit the base fee field in the response.

Security Considerations

The added field (baseFee) is informational and does not introduce technical security issues.

Copyright and related rights waived via CC0.

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