eth_feeHistory - SEI

Example code for the eth_feeHistory JSON-RPC method. Complete guide on how to use eth_feeHistory JSON-RPC in GetBlock Web3 documentation

Returns historical gas information on the Sei network, allowing analysis of gas price trends over a range of blocks.

Parameters

Parameter	Type	Description
blockCount	string	Number of blocks to return (hex or decimal)
newestBlock	string	Block number in hex, or 'latest', 'earliest', 'pending', 'safe', 'finalized'
rewardPercentiles	array	Array of percentile values (e.g., [25, 50, 75])

Request

cURL

curl --location 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data '{
    "jsonrpc": "2.0",
    "method": "eth_feeHistory",
    "params": ["0x5", "latest", [25, 50, 75]],
    "id": "getblock.io"
}'

JavaScript (axios)

Python (requests)

Rust (reqwest)

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "oldestBlock": "0x4B8F29C",
        "baseFeePerGas": ["0x3b9aca00", "0x3b9aca00"],
        "gasUsedRatio": [0.5, 0.3],
        "reward": [["0x59682f00", "0x77359400", "0x9502f900"]]
    }
}

Response Parameters

Field	Type	Description
oldestBlock	string	The oldest block in the range
baseFeePerGas	array	Array of base fees per gas
gasUsedRatio	array	Array of gas used ratios
reward	array	Array of reward arrays at the requested percentiles

Use Case

The eth_feeHistory method is essential for:

• Blockchain developers building applications on Sei

• Wallet applications requiring network data

• Analytics platforms tracking Sei network activity

• DeFi protocols integrating with Sei's parallelized EVM

Error Handling

Common errors when using this method:

Error Code	Message	Description
-32700	Parse error	Invalid JSON
-32600	Invalid Request	JSON is not a valid request object
-32601	Method not found	Method does not exist
-32602	Invalid params	Invalid method parameters
-32603	Internal error	Internal JSON-RPC error
-32000	Invalid input	Generic input error
-32500	Cross-VM error	Error in cross-VM operation (Sei-specific)

Web3 Integration

Ethers.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

// Using ethers provider methods
const result = await provider.send('eth_feeHistory', ["0x5", "latest", [25, 50, 75]]);
console.log(result);

Viem