Gas

eth_feeHistory

Returns base fee per gas and transaction effective priority fee per gas history for the requested block range if available.

Parameters

Name	Type	Description
blockCount	QUANTITY	Number of blocks in the requested range expressed as a hexidecimal number. Between 1 (0x1) and 1024 (0x400) blocks can be requested in a single query. Less than requested may be returned if not all blocks are available.
lastBlock	QUANTITY | TAG	Highest number block of the requested range as a block number or block tag.
rewardPercentiles	Array of FLOAT	Array of floating point value between 0 and 100.

Return Value

Name	Type	Description
oldestBlock	QUANTITY	Lowest number block of the returned range expressed as a hexidecimal number.
baseFeePerGas	Array of QUANTITY	An array of block base fees per gas. This includes the next block after the newest of the returned range, because this value can be derived from the newest block.
gasUsedRatio	Array of FLOAT	An array of block gas used ratios. These are calculated as the ratio of gasUsed and gasLimit.
reward	Array of QUANTITY	An array of effective priority fee per gas data points from a single block. All zeroes are returned if the block is empty.

Example

// Request
curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_feeHistory","params":["0x10", "latest", [0.1, 0.2, 0.3]],"id":1}' https://kaia.nownodes.io

// Result
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "oldestBlock": "0xa5b",
    "reward": [
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x5d21dba00",
        "0x5d21dba00",
        "0x5d21dba00"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x5d21dba00",
        "0x5d21dba00",
        "0x5d21dba00"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x5d21dba00",
        "0x5d21dba00",
        "0x5d21dba00"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x0",
        "0x0",
        "0x0"
      ]
    ],
    "baseFeePerGas": [
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0",
      "0x0"
    ],
    "gasUsedRatio": [
      0,
      0,
      0,
      0,
      0,
      0.0002952004000002952,
      0,
      0,
      0.00029504250000029504,
      0,
      0,
      0.0002963777000002964,
      0,
      0,
      0,
      0
    ]
  }
}

eth_maxPriorityFeePerGas

Returns a suggestion for a gas tip cap for dynamic fee transaction in peb.

NOTE: This API has different behavior from Ethereum's. Before Magma hardfork, it returns a gas price of Klaytn instead of suggesting a gas price as in Ethereum. After Magma hardfork, it just returns 0.

Parameters

None

Return Value

Type	Description
QUANTITY	Integer of the current gas price in peb.

Example

// Request
curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_maxPriorityFeePerGas","params":[],"id":1}' https://kaia.nownodes.io

// Result
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0xAE9F7BCC00" // 250,000,000,000 peb = 250 ston (Gwei)
}