kaia_estimateGas

The eth_estimateGas method generates and returns an estimate of how much gas is necessary to allow the transaction to complete on the Kaia network. The transaction will not be added to the blockchain, making it a simulation for gas estimation purposes.

This method is crucial for determining the appropriate gas limit before sending a transaction, helping users avoid out-of-gas errors and optimize transaction costs. The estimate accounts for the computational complexity of the transaction, including contract execution and state changes. Developers use this to set appropriate gas limits, inform users of transaction costs, detect transactions that will fail due to insufficient gas, and optimize contract interactions. Note that the actual gas used may differ slightly from the estimate due to state changes between estimation and execution.

Parameters

parameter	type	description
transaction	object (required)	Transaction call object
blockParameter	string (optional)	Block number in hex format (e.g., '0x10d4f') or one of the string tags: 'latest', 'earliest', or 'pending'. Defaults to 'latest'

Transaction Object Properties:

property	type	description
from	string (optional)	The address the transaction is sent from (20 bytes)
to	string (optional)	The address the transaction is directed to (20 bytes). Null for contract creation
gas	string (optional)	Upper limit of gas to use for estimation (hex)
gasPrice	string (optional)	Gas price in wei (hex)
value	string (optional)	Value transferred in wei (hex)
data	string (optional)	Hash of the method signature and encoded parameters, or contract bytecode for deployments

Return Object

field	type	description
result	string	The estimated amount of gas needed for the transaction encoded as hexadecimal. It's recommended to add a buffer (typically 10-20%) to this estimate when setting the actual gas limit to account for state changes and ensure transaction success.

Request Example

Request

Response Example

Response