[Transaction] eth_estimateGas

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain. Note that the estimate may be significantly more than the amount of gas actually used by the transaction, for a variety of reasons including EVM mechanics and node performance.

JSONRPC: eth_estimateGas

Request

application/json

Body

method stringrequired

Default value: eth_estimateGas

Method name

id int64required

Default value: 1

Request ID, Random or Auto incrementation

jsonrpc stringrequired

Default value: 2.0

JSON-RPC Version (2.0)

params

undefined[]

Array [

EthCallObject

object

The transaction call object. See the next table for the object's properties.

from 20-byte DATA

(optional) Address the transaction is simulated to have been sent from. The 0x00..0 address is used if no address is specified.

to 20-byte DATA

(optional) Address the transaction is sent to.

gas hex

(optional) Maximum gas allowance for the code execution to avoid infinite loops. Defaults to 2^63 or whatever value the node operator specified via --rpc.gascap.

gasPrice hex

(optional) Number of peb to simulate paying for each unit of gas during execution. Defaults to 0 peb.

value hex

(optional) Amount of peb to simulate sending along with the transaction. Defaults to 0.

input DATA

(optional) Hash of the method signature and encoded parameter. It replaces data field, but 'data` field is still supported for backward compatibility.

]

Responses

200

Return the amount of gas used.

application/json

Schema

Schema

jsonrpc stringrequired

Default value: 2.0

id int64required

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 hex

The amount of gas used.

Example (from schema)

{
  "jsonrpc": "2.0",
  "id": 0,
  "error": {
    "code": -32700,
    "message": "Parse error",
    "data": "string"
  },
  "result": "0x5208"
}

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