klay_estimateGas

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete.

Parameters

NameTypeDescription

callObject

Object

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

callObject has the following properties:

NameTypeDescription

from

20-byte DATA

(optional) The address the transaction is sent from.

to

20-byte DATA

(optional when testing the deployment of a new contract) The address the transaction is directed to.

gas

QUANTITY

(optional) Integer of the upper gas limit provided for the gas estimation. If no gas limit is specified, the Klaytn node uses the designated gas limit as an upper bound.

gasPrice

QUANTITY

(optional) Integer of the gasPrice used for each paid gas.

value

QUANTITY

(optional) Integer of the value sent with this transaction.

data

DATA

(optional) Hash of the method signature and encoded parameters.

Return Value

TypeDescription

QUANTITY

The amount of gas used.

Example

// Request
curl -H "Content-Type: application/json" --data '{"jsonrpc": "2.0", "method": "klay_estimateGas", "params": [{"from": "0x3f71029af4e252b25b9ab999f77182f0cd3bc085", "to": "0x87ac99835e67168d4f9a40580f8f5c33550ba88b", "gas": "0x100000", "gasPrice": "0x5d21dba00", "value": "0x0", "data": "0x8ada066e"}], "id": 1}' http://klaytn.blockpi.network/v1/rpc/your-api-key

// Result
{
  "jsonrpc": "2.0","id":1,
  "result": "0x5208" // 21000
}

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