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[Gas] klay_feeHistory

Returns historical gas information for a range of blocks.

NOTE: This API is effective after Kaia v1.8.0

JSONRPC: klay_feeHistory

Request

application/json

Body

params

undefined[]

required

Array [

BlockCount Hexadecimal

Number of blocks in the requested range in hexadecimal. 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.

BlockNumberOrTag

object

oneOf

IntegerBlockNumber

the block number with type integer

number

HexadecimalBlockNumber

the block number with type hexadecimal

string

BlockTag

the block tag [latest, pending, earliest]

string

rewardPercentiles float[]

An array of floating point values between 0 and 100.

]

Responses

200

Returns historical gas information for a range of blocks.

application/json

Schema

Schema

error

object

code int64required

A Number that indicates the error type that occurred. This MUST be an integer.

code	message	description
-32700	Parse error	invalid JSON was received by the server. An error occurred on the server while parsing the JSON text.
-32602	Invalid params	Invalid method parameter(s).

message string

A String providing a short description of the error. The message SHOULD be limited to a concise single sentence.

data string

A Primitive or Structured value that contains additional information about the error. This may be omitted. The value of this member is defined by the Server (e.g. detailed error information, nested errors etc.).

result

object

oldestBlock Hexadecimalrequired

Lowest number block of returned range.

baseFeePerGas Hexadecimal[]required

An array of block base fee per gas. This includes the next block after the newest of the returned range, because this value can be derived from the newest block. Zeroes are returned for pre-Magma blocks.

gasUsedRatio float[]required

An array of block gas used ratios. Measures the network congestion level. These are calculated as the ratio of block gas used and KIP-71 MAX_BLOCK_GAS_USED_FOR_BASE_FEE. If the ratio is above 1, then 1 is returned.

reward array[]

A 2D array of effective priority fees per gas. reward[n][i] is the rewardPercentiles[i]-th percentile effective priority fees per gas among the transactions in the block oldestBlock + n. Only returned if rewardPercentiles is specified.

Example (from schema)

{
  "jsonrpc": "2.0",
  "id": 0,
  "error": {
    "code": -32700,
    "message": "Parse error",
    "data": "string"
  },
  "result": {
    "oldestBlock": "0xa5b",
    "reward": [
      [
        "0x0",
        "0x0",
        "0x0"
      ],
      [
        "0x5d21dba00",
        "0x5d21dba00",
        "0x5d21dba00"
      ]
    ],
    "baseFeePerGas": [
      "0x0",
      "...",
      "0x0"
    ],
    "gasUsedRatio": [
      0,
      "...",
      0.0002963777000002964
    ]
  }
}

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