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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
eth_feeHistory
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_feeHistory",
  "id": 1,
  "params": [
    1024,
    "latest",
    [
      10,
      20,
      30
    ]
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {
    "oldestBlock": "<string>",
    "baseFeePerGas": [
      "<string>"
    ],
    "gasUsedRatio": [
      123
    ],
    "reward": [
      [
        "<string>"
      ]
    ]
  }
}
Optimism API method eth_feeHistory retrieves historical gas fee data, providing insights into gas price trends and block utilization over time. This method is valuable for estimating transaction fees and understanding network congestion.
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​
Parameters

  • blockCount — the number of blocks to include in the history.
  • newestBlock — the newest block (by number or one of the strings "earliest", "latest", or "pending") to include in the history.
  • rewardPercentiles — an array of percentiles to calculate effective priority fees over the requested blocks.

​
Response

  • result — an object containing:
    • oldestBlock — the oldest block number in the history.
    • baseFeePerGas — an array of base fees per gas for each block.
    • gasUsedRatio — an array of ratios of gas used to gas limit for each block.
    • reward — an array of arrays containing the priority fees at the specified percentiles for each block.

​
Use case

The eth_feeHistory method is essential for:
  • Wallets and interfaces providing users with data-driven gas price suggestions.
  • Applications and services monitoring Optimism network congestion and optimizing transaction fee estimates.
  • Analysts studying Optimism gas fee trends and block space utilization.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_feeHistory
​
id
integer
default:1
​
params
(integer | string | integer[] | string[])[]

Response

200 - application/json

Historical gas fee data

​
jsonrpc
string
​
id
integer
​
result
object
Last modified on August 7, 2025